Review Top 9 best AI Chatbot ever – Is ChatGPT for free?

AI Chatbot is a computer program that uses artificial intelligence to simulate human-to-human conversation, capable of understanding and responding to user requests naturally and accurately. In this article, FPT.AI will present in-depth information about the core technologies, types of AI Chatbot, and their popular applications. The article also provides detailed reviews of the features and advantages of the top 9 AI chatbot online free that you can leverage to level up your performance.

What is an AI Chatbot?

AI Chatbot is a computer program designed to simulate human conversation, interacting with users through text or voice. AI Chatbot combine artificial intelligence, Machine Learning, and Natural Language Processing (NLP) to understand and analyze user requests, then apply Natural Language Generation (NLG) techniques to provide appropriate, accurate, and natural human-like responses.

In reality, you may have already interacted with chatbots through various activities, from smart speakers in your home, popular messaging applications like SMS, WhatsApp, and Facebook Messenger, to work platforms like Slack. These bots simulate natural conversation and try to resolve your queries before transferring to human representatives if necessary.

With the ability to automate conversations, AI Chatbot help organizations and businesses flexibly scale, personalize, and improve communication capabilities in many activities – from internal workflows and customer service to DevOps management.

Review of TOP 9 AI Chatbot online free

FPT.AI Chat

FPT.AI Chat is one of the leading AI chatbot platforms in Vietnam, developed by FPT Smart Cloud – a member of FPT Technology Group. This artificial intelligence solution is designed to help businesses automate customer care, optimize consultation processes, and increase business efficiency. Not only possessing superior Vietnamese natural language processing technology, FPT.AI Chat also stands out with its deep and flexible integration capabilities, suitable for many different industries.

FPT.AI Chat uses Generative AI technology and Deep Learning, helping the chatbot correctly understand the intent and context of user questions. The accurate response rate can reach over 90%. This allows the chatbot to quickly and accurately handle common questions related to products, prices, promotions, or purchasing processes, thereby reducing repetitive work for consultants, helping them focus on situations requiring higher expertise.

Additionally, FPT.AI Chat has multi-platform integration capabilities, from websites and mobile applications to popular channels such as Facebook Messenger, Zalo, Viber, Instagram, WhatsApp, and even the business social network GapoWork. Businesses only need to build a chatbot once and can deploy it across multiple channels, effectively expanding customer reach.

Besides the main features, FPT.AI Chat is continuously updated with add-ons based on actual needs:

• Rating Agent: Allows customers to rate their satisfaction with consultants or with the chatbot itself after each conversation session, helping businesses measure support quality and improve services.
• User Reaction: Users can respond with emoji reactions to chatbot answers, creating a more natural and interesting conversation experience. These interactions are compiled to improve response quality.
• Typing Suggestion: Suggests questions for users based on keywords being typed, saving time and directing the conversation more effectively.
• Copy Model: Useful in the testing and deployment phases of chatbots, allowing the copying of model structures from a test bot to an official bot, ensuring consistency and accuracy when put into actual operation.

Since July 2024, LPBank has officially deployed FPT.AI Chat on their website, Zalo OA, and fanpages to automate 24/7 customer care processes. This banking chatbot can handle a range of common issues such as account registration, product information, interest rate consultation… and is ready to connect with consultants when customers need in-depth support. This brings a seamless, modern experience that aligns with the trend of digitizing banking services.

According to representatives from FPT Smart Cloud and LPBank, the FPT.AI chatbot is not just a support tool but an intelligent interaction bridge, helping the bank maintain engagement with customers across multiple channels. This is a powerful “made in Vietnam” AI chatbot solution, suitable for Vietnamese businesses looking to effectively digitally transform, enhance customer care quality, and optimize operations with advanced AI technology.

ChatGPT

ChatGPT, developed by OpenAI, has become a global phenomenon and is currently the most popular free AI chat software. This AI Chatbot uses Deep Learning technology to generate natural, intelligent, and contextually accurate responses.

Users can ask questions and communicate via text, request tasks such as writing paragraphs, writing programming code, and composing emails as if conversing with a real person. ChatGPT also supports many different languages, including Vietnamese, ensuring it meets the learning and working needs of Vietnamese users.

ChatGPT provides many outstanding features such as:

• Content management
• Programming support
• Processing and analyzing big data to provide detailed reports
• Predicting business trends and supporting strategic decision-making
• Creating images from text through DALL-E 3
• Analyzing and summarizing data

With the latest version, OpenAI has added many creative features such as:

• Search tool to find information on the web and cite sources
• Deep Research acts as an assistant that reads and analyzes all search results to create in-depth reports
• Projects allows uploading documents and setting up system guidelines to direct how ChatGPT responds
• Canvas is a new output mode that helps users write together with ChatGPT
• Advanced Voice Mode allows real-time voice interaction
• Operator AI Agent can perform tasks by browsing the web
• Sora, OpenAI’s AI video model (currently only available to Pro users in the United States)

Regarding service packages, ChatGPT offers several options:

• ChatGPT 3.5: Free, but with limited uses per day
• ChatGPT Plus: $20/month, unlocks many advanced features and unlimited use
• ChatGPT Pro: $200/month
• ChatGPT Team: $20-30/user/month, designed for small teams
• ChatGPT Enterprise: Variable pricing depending on needs

To use ChatGPT, users only need to access the website https://chatgpt.com/ and log in with an existing account or register a new one. When starting a conversation, you just need to enter content in the box at the bottom of the screen. When results are displayed, a new item will be created in the left menu, helping you easily manage and interact with previous conversations.

However, the biggest limitations of the free version of ChatGPT that you should note include:

• Limited usage per day, which can cause interruptions in your workflow.
• Does not provide source citations and has no indicators of the accuracy of answers.

Claude

Claude AI is an artificial intelligence integrated chatbot developed by Anthropic – a technology startup based in San Francisco, USA, notable for its direction of developing AI that is “safe, ethical, and transparent.” Although still unfamiliar to most Vietnamese users, Claude AI is increasingly highly rated and considered one of the smartest chatbots available today, supporting users with:

• Answering questions
• Creating content based on requests
• Writing emails
• Translating between multiple languages, including Vietnamese
• Summarizing long text files and website content
• Processing images or scanned documents, recognizing handwritten text with high accuracy, even when the content is in Vietnamese

A superior advantage of Claude is its ability to remember large contexts – up to 150,000 words in a conversation. This is ideal for uploading long documents like PDF files, analyzing and discussing them in depth without “forgetting” information like many other chatbots. Claude also saves conversation history, allowing users to review previous queries – very convenient for those who frequently analyze data or work with repetitive information.

Especially recently, this AI Chatbot launched the “Artifacts” feature, allowing users to create visual, interactive data dashboards that can be edited right in the conversation, such as personal budget planning tables or simple physics games with just a few command lines. Everything is updated in real-time without having to leave the chat interface.

Claude currently has three AI model versions, each suitable for different needs:

• Claude Haiku: Fast, concise, suitable for user-oriented applications and big data processing.
• Claude Sonnet: More advanced, capable of reasoning and writing complex code. This version is currently testing the “computer use” feature, allowing AI to operate like a real user on a computer.
• Claude Opus: The strongest, excelling in natural language understanding, content creation, and programming. Although stronger than Sonnet, the processing speed is still comparable.

Claude is often rated as having a more pleasant, emotional conversational style compared to ChatGPT. Therefore, this AI Chatbot is very suitable for business environments or when communicating with customers. Additionally, Claude also has an active community on Reddit, where users share experiences, discuss, and support each other during use.

To use Claude AI, users only need to access the website claude.ai/login to register or log in with a Gmail account. It’s worth noting that in the free package, the number of messages per day from Claude may vary depending on overall usage levels. If you want to experience all features, you can upgrade to the Pro package for $20/month, unlocking additional utilities such as integration with Zapier to automate workflows.

Deepseek

DeepSeek is an artificial intelligence model developed in China, with two main versions: DeepSeek V3 and DeepSeek R1. Of these, DeepSeek R1 is the latest version, specially designed to handle tasks related to logical reasoning and problem-solving. Many users rate DeepSeek R1 as comparable to powerful OpenAI models like ChatGPT o3.

Notably, DeepSeek R1 is an open-source AI Chatbot and completely free to use. Users can access the model through a web application or download it to run on personal computers or servers, as long as the device is powerful enough to process it. This opens up many opportunities for AI access to individuals, small organizations, or developers wanting to integrate AI without licensing costs.

The interface of the DeepSeek application – whether on the web or mobile devices – is quite basic, focusing only on the main function of text input. Users can send questions, request web searches, upload text documents for content extraction, and review the history of previous conversations.

However, DeepSeek doesn’t understand images, only reading the text portions of documents. Additionally, another notable disadvantage to consider is the data security issue. Because DeepSeek application servers are located in China, the storage and processing methods of user data remain unclear. This may be concerning for those who prioritize personal information privacy.

Microsoft Copilot

Built on OpenAI’s AI platform, Microsoft Copilot is not just an AI Chatbot but a comprehensive virtual assistant, helping to optimize workflows, increase productivity, and deliver a seamless user experience for both individuals and businesses. The greatest strength of Microsoft Copilot is its deep integration into Microsoft Office flagship products such as Word, Excel, PowerPoint, Teams, the Edge browser, and the Windows 11 operating system.

In Word, you can ask Copilot to draft text from simple suggestions; in Excel, the tool can analyze data and create charts; and in PowerPoint, it helps build professional presentation slides with just a few lines of guidance. This is a major advantage over standalone chatbots like ChatGPT, especially for users already familiar with the Microsoft work environment.

Users can quickly access it from the taskbar to ask questions, search the Internet, suggest ideas, or quickly open installed applications without downloading additional software. If you don’t see the Copilot icon, simply search for the term “Copilot” in the Windows search menu to activate it.

Not only supporting office work, Copilot also impresses with its ability to create unlimited images, serving well for illustration needs, simple design, or creating visual content. This is an outstanding point compared to many current AI chatbots that don’t support image creation.

Another interesting aspect of Copilot is its ability to customize and personalize the user experience. On first use, Copilot may ask your name to personalize the conversation. Responses from Copilot not only answer questions but often end with expansion suggestions, inviting users to continue interacting. Additionally, Microsoft’s large user community, from official forums to Reddit groups, provides a helpful and dynamic support ecosystem.

Microsoft offers two versions: a free version with basic features and Copilot Pro, allowing access to the latest AI models, prioritized processing, and integration of more in-depth features. Furthermore, Microsoft is developing specialized versions for specific fields such as sales, finance, or cybersecurity – suitable for large organizations wanting to use AI to improve operational efficiency.

However, some users feel that responses from Copilot are sometimes not deep enough or lack updated elements such as analyzing modern trends (e.g., changes due to digitization, streaming…). Additionally, compared to competitors like ChatGPT, some versions of Copilot are rated as not “sharp” enough, feeling like a “condensed” version.

Gemini

Gemini is an AI chatbot developed by Google with the ability to deeply integrate with the entire Google ecosystem – from Gmail, Drive, Docs, Sheets to services like Maps, Flights, or YouTube. Users only need to log in once to access it directly from Gmail, Calendar, or Docs without switching between platforms, maximizing the use of familiar tools in work and daily life. This transforms Gemini into a truly intelligent assistant tied to Google usage habits.

You can ask Gemini to search for emails in your Gmail inbox, summarize document content in Drive, check flight or hotel prices in real-time, and even plan vacations and suggest packing lists for trips.

Beyond convenience, Gemini is also highly rated for its ability to understand deep context and remember long conversation information (this AI Chatbot can store content equivalent to the entire Harry Potter series). This allows Gemini to process complex queries, analyze in-depth content, and respond naturally, like having a real conversation with a knowledgeable person.

Not limited to text, Gemini can generate multimedia content such as videos, images, and music. Additionally, users can write and run Python code directly within the interface – a very useful feature for programmers or highly technical users.

Another special feature is Gems – a feature that allows personalizing the experience similar to GPTs in ChatGPT. Users can create customized Gemini versions by adding specific instructions for the chatbot to respond according to their own style or purpose.

However, Gemini’s response quality is sometimes inconsistent – with the same query, you might receive different answers if you try again later. Therefore, when using it for important tasks, users should carefully check information before applying it. Google is also transparent about this, displaying warnings that Gemini may make mistakes and encouraging users to verify content.

Meta AI

Meta AI is an AI chatbot software developed by Meta – the parent company of Facebook – and integrated directly into familiar applications such as Facebook, Instagram, Messenger, and WhatsApp. The introduction of Meta AI marks a step forward in bringing artificial intelligence closer to social media users by leveraging the very platforms that millions of people use daily.

Meta AI uses the LLaMA 3 language model, the latest version, with over 70 billion parameters. This is one of the most powerful large language models currently available, capable of understanding and processing language well and supporting users in various tasks such as chatting, content creation, information searching, and even creating images, short videos, or animations – completely free.

Meta AI also supports Vietnamese language, making it very friendly and accessible to Vietnamese users. Thanks to direct integration into Facebook, Instagram, and Messenger, you only need to log in with your social media account to start chatting with AI right within the application you’re using, without downloading additional apps or switching platforms.

Meta AI also has the ability to create images and animations right in the conversation. Users can request AI to create illustrative images based on descriptions, even simple short videos.

Meta AI still has some weaknesses:

• Web information search capability is not as strong as ChatGPT or Gemini; users need to verify information from sources for important content
• Limited extensibility, not yet suitable for deep customization or expansion to specialized business needs.

However, if you are a developer, Meta offers a great opportunity with its open licensing policy for LLaMA models. You can use this model to build your own AI applications without paying licensing fees, as long as revenue doesn’t exceed a very high threshold. This helps individuals and small businesses easily access powerful AI technology without financial barriers.

Perplexity

Perplexity is an AI chatbot notable for its ability to conduct in-depth information searches and provide clear source citations. Unlike traditional AI tools that often just provide answers, Perplexity is an intelligent search tool that can display search results with a list of sources, helping users access, verify, and continue to explore content easily and visually.

You can continue expanding your search by entering additional questions or selecting from a list of related search suggestions. Responses will be stacked in a scrolling format, allowing you to easily follow the information flow throughout the conversation.

Perplexity also supports purpose-specific search modes, such as product suggestions, healthy cooking recipes, or finding hotels through TripAdvisor. You just need to check “Copilot” in the search bar, and this AI Chatbot will present a series of sub-questions to clarify your intention, then compile the most accurate and complete content.

Perplexity also has the ability to share conversations: recipients can continue the conversation from where you left off, while you can see the number of views, likes, and follow-up questions from the community. This AI Chatbot also has a “Discover” section – a place that compiles popular searches into short, easy-to-understand, and engaging articles. Technologically, Perplexity uses many powerful AI models such as OpenAI GPT, Claude, and DeepSeek, while also leveraging Wolfram Alpha to process real-time data or solve complex problems.

The free version of Perplexity allows users to use some basic features, including 3 Pro queries per day. Meanwhile, the Perplexity Pro package ($20/month) expands access to up to 300 Pro queries/day, along with the ability to analyze files, display data in image format, and choose AI models at will.

Regarding the interface, Perplexity is rated as clean and easy to use, with help sections, guides, and shortcuts clearly arranged. The system always operates stably, and the user community on Discord as well as Perplexity’s blog regularly share knowledge and effective usage tips.

Grok

Grok is an AI chatbot developed by xAI, Elon Musk’s company. The name “Grok” comes from an English word meaning “to understand intuitively,” and true to its name, Grok was built to become an AI Chatbot with deep reasoning abilities and intelligent responses.

Initially, Grok was only available within the X social media platform (formerly Twitter) and required users to pay. However, currently, you can use Grok for free through web and mobile applications, making it more accessible to many people. The latest version of this AI Chatbot is Grok 3, released in February 2025, quickly entering the top chatbot rankings, surpassing many other well-known competitors.

This AI Chatbot has a diverse system of functions, with options serving many learning, work, and entertainment needs such as:

• DeepSearch: Dive deep into a specific topic
• Brainstorm: Support creative idea generation
• Analyze Data: Aanalyze documents, data
• Create Images: Create images on request (for example, “an otter playing ukulele”)
• Code: Programming support

Regarding response style, Grok has a friendly approach with a touch of light humor, not too serious but also not excessively comedic. Some users describe Grok’s style as “slightly rebellious” compared to GPT-4o, but overall it maintains coherence and professionalism when needed.

Another significant advantage of Grok is its ability to update and respond in real-time. Because it’s deeply integrated with the X platform – which frequently updates trends and news – Grok can answer questions about hot topics quickly and flexibly.

However, Grok has also been involved in controversies related to accuracy, especially when handling topics with political elements. This requires users to verify information in sensitive cases or those of high importance.

Outstanding benefits of AI Chatbot

AI Chatbot brings clear benefits to both businesses and customers:

• 24/7 Customer Support: Before chatbots, all customer inquiries required direct human response. This was especially difficult when issues arose outside working hours, on weekends, or holidays. Maintaining a 24/7 support team requires high costs and is challenging to manage. With AI Chatbot, businesses can solve human resource issues, ensuring timely support, eliminating waiting times, and ensuring customers always receive immediate responses.
• Reduced Operating Costs: Implementing chatbots can help save up to 30% of operating costs, reducing the need for customer support center staffing, while minimizing time and costs related to training employees to answer repetitive queries.
• Enhanced Customer Experience and Loyalty:The ability of chatbots to respond quickly and accurately creates an excellent user experience. Satisfied customers are more likely to show loyalty to the brand and complete purchase transactions.
• Improved Human Resource Management: Chatbots automate workflows and free employees from repetitive tasks, allowing them to focus on more complex issues. Businesses can enhance staff efficiency to meet increased demands.

• Generate Leads and Increase Conversion Rates: Chatbots can assist customers in the purchasing process by answering questions about products or services on the spot, helping customers move toward making a purchase. For complex transactions, chatbots can assess lead quality and connect them with sales agents.
• Continuous Learning and Improvement: With Deep Learning technology and Natural Language Processing (NLP), AI chatbot continuously learns from previous interactions to improve response quality, becoming smarter and more flexible in handling complex queries.
• Internal Administration Support: AI Chatbot integrates into internal management systems, helping automatically retrieve and synthesize data from digital document repositories. Departments such as human resources, accounting, or operations management can quickly access information, create reports, and make decisions based on real-time data.
• Multi-channel Integration and Technology Ecosystem: Chatbots easily integrate with many communication platforms such as websites, social media, and mobile applications. This flexibility helps businesses reach customers at various touchpoints while creating a seamless technology ecosystem to effectively collect and analyze customer data.

Notable Applications of AI Chatbot

Common use cases for chatbots include:

• Personalized E-commerce: In online retail, e-commerce chatbots provide personalized product recommendations based on purchase history and browsing behavior, helping increase conversion rates and improve shopping experiences.
• Conversational Marketing Strategies: Marketers use Marketing chatbots to promote products, services, and collect insights about customer interaction and purchasing patterns, creating engaging and personalized conversations across web and messaging channels.
• Office Process Automation: In finance and healthcare fields, AI chatbot helps identify fields in forms, capture customer information, and schedule appointments for healthcare offices, minimizing processing time and errors.
• Employee Self-service: IT and HR teams use chatbots to allow employees to solve common issues themselves, such as resetting passwords, accessing company policy information, or asking benefits-related questions.
• Intelligent Call Management: At contact centers, chatbots function as Interactive Voice Response (IVR) systems, streamlining incoming communications and directing customers to the right resources, along with the ability to seamlessly transfer to support staff when necessary.
• Smart Personal Assistants: Chatbots can provide automatic reminders for time or location-based tasks, helping users manage schedules and work more effectively.
• Advanced Conversational Analytics: Chatbot technology also helps extract valuable information from natural language communications between customers and businesses, providing deep insights to improve services and products.

Chatbot interaction interfaces are also very diverse, from social media messaging applications, independent messaging platforms, website integration and proprietary applications, to phone calls. This helps businesses easily reach customers across multiple channels while creating a consistent and seamless experience.

How is AI Chatbot Different from Traditional Chatbots and Virtual Assistants?

Chatbot technology has advanced tremendously since its inception in the 1960s. From interactive FAQ programs based on a limited set of common questions with fixed scripted answers requiring users to choose from simple keywords and phrases to continue the conversation, today we have intelligent AI chatbots with many impressive capabilities such as:

• Understanding complex contexts in conversations
• Overcoming everything from typing errors to translation issues (Machine Translation)
• Mapping meaning with specific intentions that users want chatbots to perform
• Creating natural, diverse, and appropriate responses for each user
• Communicating in many different languages
• Self-improving performance through each interaction without requiring programmer intervention

Although the initial cost to deploy AI chatbot is higher than traditional chatbots, businesses will save many long-term costs because they don’t need to maintain large customer care teams to handle complex requests or frequently upgrade systems when business needs change.

The latest advancement in Chatbot software is chatbots using Generative AI. They are called “intelligent virtual assistants,” “Virtual Agents,” or “Virtual Assistants,” with famous representatives like Siri, Alexa, Gemini, and ChatGPT.

Besides the ability to understand and respond to user questions through Natural Language Processing (NLP) and Machine Learning, Virtual Assistants combine Conversational AI and Robotic Process Automation (RPA) to proactively perform actions on behalf of users.

For example, when asked about tomorrow’s weather, a Virtual Assistant doesn’t just answer that “it will rain” but also proactively suggests setting an earlier alarm to avoid delays due to rain. Additionally, thanks to Large Language Models (LLMs), Gen AI Chatbot can also:

• Create entirely new content (text, images, sound)
• Automatically answer questions outside the script scope based on the organization’s knowledge base without pre-programming
• Learn from previous conversations to continuously improve how conversation flows are routed
• Adapt to each user’s communication style
• Express empathy in responses

In other words, AI Chatbot are like helpful friends who know a lot of information, while Virtual Assistants are like actual personal assistants who can act on your behalf.

According to the CEO’s Guide to Generative AI report from the IBM Institute for Business Value (IBV), 85% of executives believe that Gen AI Chatbot will interact directly with customers in the next two years. Enterprise-level chatbots can also integrate into software like Microsoft Teams, creating efficient work centers, and handling from simple tasks to complex processes across different applications, helping businesses automate services and enhance user experiences.

In summary, AI Chatbot is intelligent virtual assistant, capable of learning and continuously developing to deliver optimal user experiences. This technology is changing how businesses and customers communicate while optimizing workflows and supporting management. With constant advances in Machine Learning, NLP, and Generative AI, in the future, AI Chatbot will become increasingly sophisticated, bringing convenience and improving service quality for users and businesses.