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The Best AI Chatbot Builders and Platforms in 2025

· 2 min read
CEO @ Optimly

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Introduction

AI chatbots are now essential for customer support, sales, onboarding, and automation. But with so many platforms and tools available, how do you choose the right one for your business or project? In this guide, we review the best chatbot builders and platforms in 2025—covering no-code, low-code, and open source options.


What Makes a Great Chatbot Platform?

  • Ease of use: Can you build and deploy without deep technical skills?
  • AI capabilities: Does it use LLMs, NLP, or simple rules?
  • Integrations: Can it connect to your website, WhatsApp, Slack, or CRM?
  • Customization: Can you control the bot’s tone, logic, and knowledge?
  • Analytics: Does it track conversations, leads, and user satisfaction?
  • Pricing: Is there a free plan or trial?
  • Open source: Is the code available for self-hosting or custom development?

The 6 Best Chatbot Builders and Platforms in 2025

1. Optimly

  • Type: No-code, LLM-powered
  • Best for: Fast website/chatbot deployment, analytics, business users
  • Highlights: Drag-and-drop builder, knowledge base, analytics, multi-channel (web, WhatsApp, more), free plan
  • Website: optimly.io

2. Dialogflow (by Google)

  • Type: Low-code, NLP/LLM
  • Best for: Developers, Google Cloud users
  • Highlights: Powerful intent detection, voice and text, integrates with Google ecosystem, supports fulfillment via webhooks
  • Website: dialogflow.cloud.google.com

3. Microsoft Bot Framework

  • Type: Low-code, open source SDK
  • Best for: Enterprises, developers, Microsoft stack
  • Highlights: SDKs for C#, JS, Python; Azure Bot Service; multi-channel; open source core
  • Website: dev.botframework.com

4. Rasa

  • Type: Open source, developer-focused
  • Best for: Custom, on-premise, privacy-sensitive projects
  • Highlights: Full control, train your own models, open source, strong community, advanced dialogue management
  • Website: rasa.com

5. ManyChat

  • Type: No-code, marketing focus
  • Best for: Social media, e-commerce, lead gen
  • Highlights: Facebook Messenger, Instagram, WhatsApp, SMS; visual builder; templates; automation for marketing
  • Website: manychat.com

6. Botpress

  • Type: Open source, visual builder
  • Best for: Developers, teams wanting open source with UI
  • Highlights: Visual flow editor, LLM support, on-premise or cloud, plugin ecosystem
  • Website: botpress.com

Top Open Source Chatbot Platforms (Bonus)

  • Rasa: Python-based, highly customizable, strong for enterprise and privacy
  • Botpress: Node.js, visual builder, plugin system
  • ChatterBot: Python, simple rule-based or ML chatbots
  • DeepPavlov: NLP-focused, research and production
  • OpenDialog: Conversation design, open source, flexible

How to Choose the Right Chatbot Builder

  • For business users: Look for no-code tools with analytics and easy website integration (e.g., Optimly, ManyChat)
  • For developers: Consider open source or low-code platforms (Rasa, Botpress, Dialogflow, Microsoft Bot Framework)
  • For privacy/compliance: Open source, self-hosted options (Rasa, Botpress)
  • For marketing: Social media and automation features (ManyChat)
  • For multi-channel: Check WhatsApp, Messenger, web, and API support

Frequently Asked Questions

Are open source chatbots free?
Yes, but you’ll need to host and maintain them yourself.

Can I use LLMs (like GPT-4) with these platforms?
Most modern platforms support LLM integration, either natively or via API.

Do I need to code?
No-code tools require no coding. Open source and low-code platforms are best for developers.

Which is best for my website?
If you want fast, no-code setup and analytics, try Optimly. For full control, try Rasa or Botpress.


Get Started Free with Optimly

Want to build your own AI chatbot in minutes? Sign up free and launch your first bot today!

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How to Connect an OpenAI Chatbot to Your Website

· 3 min read
CEO @ Optimly

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Introduction

OpenAI’s language models (like GPT-4) have made it possible to build chatbots that can answer questions, guide users, and automate support with natural, human-like conversation. But how do you actually connect an OpenAI chatbot to your website?

This guide walks you through the process, from planning and setup to embedding and improvement. The focus is on practical steps and best practices, not just promotion.


What You Need to Get Started

  • An OpenAI API key (from platform.openai.com)
  • A website where you can add custom code (WordPress, Wix, Shopify, Webflow, custom HTML, etc.)
  • (Optional) A chatbot platform that supports OpenAI integration (for no-code setup)

Step 1: Plan Your Chatbot

Before you start coding or configuring, consider:

  • Purpose: What do you want your chatbot to do? (Support, sales, onboarding, etc.)
  • Audience: Who will use it? What are their common questions?
  • Knowledge: What info should it have? (FAQs, product details, policies)
  • Tone: Should it be formal, friendly, or playful?

Step 2: Choose Your Integration Method

You have two main options:

1. Direct API Integration (Custom Code)

  • Use JavaScript (frontend) or Python/Node.js (backend) to call the OpenAI API
  • Build your own chat UI and handle message flow
  • Full control, but requires programming skills

2. No-Code/Low-Code Chatbot Platform

  • Use a platform (like Optimly) that connects to OpenAI for you
  • Drag-and-drop builder, knowledge base, analytics, and easy website embed
  • No coding required

Step 3: Build and Test Your Chatbot

If Using Direct API Integration

  1. Set up your chat UI (HTML/CSS/JS or a framework like React)
  2. Capture user input and send it to your backend or directly to OpenAI’s API
  3. Display the AI’s response in the chat window
  4. Add error handling, loading states, and basic security (never expose your API key in frontend code)

Example (Node.js backend):

const { Configuration, OpenAIApi } = require('openai');
const configuration = new Configuration({ apiKey: process.env.OPENAI_API_KEY });
const openai = new OpenAIApi(configuration);

app.post('/chat', async (req, res) => {
const userMessage = req.body.message;
const response = await openai.createChatCompletion({
model: 'gpt-4',
messages: [{ role: 'user', content: userMessage }],
});
res.json({ reply: response.data.choices[0].message.content });
});

If Using a No-Code Platform

  1. Sign up and create a new chatbot agent
  2. Add your business knowledge (FAQs, docs, etc.)
  3. Connect your OpenAI API key (if required)
  4. Test the chatbot in the platform’s console

Step 4: Embed the Chatbot on Your Website

  • Copy the embed code (JavaScript snippet or iframe) from your platform or your own code
  • Paste it before the closing </body> tag on your website
  • Save and publish—your chatbot is now live!

Best Practices

  • Never expose your OpenAI API key in frontend code—always use a backend or a secure platform
  • Be transparent: Let users know they’re chatting with AI
  • Review conversations: Regularly check logs to improve accuracy
  • Provide escalation: Offer a way to reach a human for complex issues
  • Respect privacy: Don’t collect sensitive info unless you have proper security

Frequently Asked Questions

Can I use OpenAI chatbots on any website?
Yes, as long as you can add a code snippet or use a supported platform.

Do I need to code?
Not if you use a no-code platform. Direct API integration requires programming skills.

Is it secure?
Never expose your API key in the browser. Use a backend or a trusted platform.

Can I connect to other channels (WhatsApp, Messenger, etc.)?
Many platforms support multi-channel deployment.


Get Started Free with Optimly

Want to connect an OpenAI chatbot to your website in minutes? Sign up free and launch your first AI chatbot today!

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How to Deploy a GPT-Powered Chatbot on Your Website

· 3 min read
CEO @ Optimly

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Introduction

Adding a GPT-powered chatbot to your website can transform how you support, engage, and convert visitors. These AI chatbots use advanced language models to answer questions, guide users, and automate tasks—24/7, with natural, human-like conversation.

This guide walks you through the process of deploying a GPT-powered chatbot on your website, from planning and setup to launch and improvement. No prior coding experience required.


What Is a GPT-Powered Chatbot?

A GPT-powered chatbot uses a large language model (like OpenAI’s GPT-4) to understand and respond to user messages. Unlike rule-based bots, GPT chatbots can:

  • Handle open-ended questions
  • Understand context and intent
  • Generate natural, helpful replies
  • Learn from your business knowledge and FAQs

Why Add a GPT Chatbot to Your Website?

  • Instant support: Answer questions any time, even outside business hours
  • Lead generation: Capture emails, book meetings, and qualify prospects
  • Reduce workload: Automate repetitive queries and free up your team
  • Personalization: Tailor responses to each visitor’s needs

Planning Your Chatbot

Before you start, consider:

  • Goals: What do you want your chatbot to achieve? (Support, sales, onboarding, etc.)
  • Audience: Who will use it? What are their common questions?
  • Knowledge: What info should it have? (FAQs, product details, policies)
  • Tone: Should it be formal, friendly, or playful?

Step 1: Choose a Platform

To deploy a GPT-powered chatbot, you’ll need a platform that supports large language models and website integration. Look for:

  • Easy setup (no-code or low-code)
  • Customizable knowledge base
  • Website embed options
  • Analytics and improvement tools

Step 2: Set Up Your Chatbot

  1. Create an account on your chosen platform (e.g., Optimly).
  2. Create a new chatbot agent.
  3. Add your business knowledge: Upload FAQs, documents, or write custom answers.
  4. Customize the chatbot’s personality and welcome message.
  5. Test the chatbot using the built-in console to ensure it answers as expected.

Step 3: Embed the Chatbot on Your Website

  1. Go to the Integrations or Embed section in your chatbot platform.
  2. Copy the provided code snippet (usually JavaScript or iframe).
  3. Paste the code before the closing </body> tag on your website.
  4. Save and publish your site. The chatbot should now appear as a chat bubble or widget.
  • Works with most website builders (WordPress, Wix, Shopify, Webflow, custom HTML, etc.)
  • You can usually customize the chat bubble’s color, position, and greeting

Step 4: Monitor and Improve

  • Use analytics to track conversations, common questions, and user satisfaction
  • Update your knowledge base as new questions arise
  • Refine responses and add integrations (lead forms, appointment booking, WhatsApp, etc.)

Best Practices

  • Be transparent: Let users know they’re chatting with AI
  • Escalate when needed: Offer a way to reach a human for complex issues
  • Review conversations: Regularly check logs to improve accuracy
  • Respect privacy: Don’t collect sensitive info unless you have proper security

Frequently Asked Questions

Do I need to know how to code?
No. Most modern platforms offer no-code setup and easy embedding.

Can I use my own GPT model?
Some platforms let you connect your own API key or use their built-in models.

Will it work on any website?
Yes, as long as you can add a code snippet to your site.

Can I connect to other channels (WhatsApp, Messenger, etc.)?
Many platforms support multi-channel deployment.


Get Started Free with Optimly

Want to deploy a GPT-powered chatbot in minutes? Sign up free and launch your first AI chatbot today!

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How to Build Your First AI Chatbot (Step by Step)

· 3 min read
CEO @ Optimly

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Introduction

Want to add a smart, conversational AI chatbot to your website—without writing a single line of code? In this guide, you’ll learn how to build, customize, and launch your own AI chatbot for free using Optimly’s no-code platform.


Why Add a Chatbot to Your Website?

  • 24/7 support: Answer questions and capture leads even when you’re offline.
  • Instant responses: Delight visitors with fast, accurate answers.
  • Grow your business: Book appointments, collect emails, and qualify leads automatically.
  • No coding required: Anyone can do it—no technical skills needed!

What Is an AI Chatbot?

An AI chatbot is a software application that uses artificial intelligence and natural language processing (NLP) to simulate human-like conversations. Modern chatbots can answer questions, guide users, collect information, and even perform actions like booking appointments or capturing leads. They can be rule-based (simple scripts) or powered by large language models (LLMs) for more flexible, context-aware interactions.


How Do Website Chatbots Work?

Website chatbots typically appear as a chat bubble or widget on your site. When a visitor types a question, the chatbot processes the input, searches its knowledge base or uses an AI model to generate a response, and replies instantly. Advanced chatbots can:

  • Understand context and intent
  • Pull information from documents or FAQs
  • Escalate to a human if needed
  • Integrate with tools (CRMs, calendars, email, etc.)

Planning Your Chatbot

Before you build, consider:

  • Purpose: What do you want your chatbot to do? (Answer FAQs, qualify leads, support customers, etc.)
  • Audience: Who will use it? What are their common questions or needs?
  • Knowledge: What information should it have? (Product info, policies, troubleshooting, etc.)
  • Tone: Should it be formal, friendly, playful?

Write down a few sample questions and answers to guide your setup.


Step 1: Sign Up for a Free Optimly Account

  1. Go to optimly.io and click Get Started Free.
  2. Create your account in seconds—no credit card required.

Step 2: Create Your First Chatbot Agent

  1. In your Optimly dashboard, click Create Agent.
  2. Give your agent a name (e.g., "Website Assistant").
  3. Choose a personality and language style.
  4. Click Create to launch your agent.

Step 3: Add Knowledge and Customize Responses

  1. Go to the Knowledge tab for your agent.
  2. Add FAQs, product info, or upload documents.
  3. Use Optimly’s templates for common business types (support, sales, bookings, etc.).
  4. Test your agent in the built-in console.
  • Tip: Start with your most common questions. You can always add more later.
  • Testing: Use the test console to see how your bot responds and refine as needed.

Step 4: Embed the Chatbot on Your Website

  1. Go to the Integrations tab.
  2. Click Embed on Website.
  3. Copy the provided code snippet.
  4. Paste it before the </body> tag on your website.
  5. Save and publish your site—your chatbot is live!
  • Where to place the code: The embed snippet works on most website builders (WordPress, Wix, Shopify, Webflow, custom HTML, etc.). Place it just before the closing </body> tag for best results.
  • Customization: You can adjust the chat bubble’s color, position, and welcome message in the Optimly dashboard.

Step 5: Track Results and Improve

  • Use the Analytics dashboard to see conversations, leads, and user satisfaction.

  • Refine your knowledge base and responses based on real user questions.

  • Add more tools (lead forms, appointment booking, WhatsApp integration) as you grow.

  • Analytics: Review which questions are most common, where users drop off, and how many leads you capture.

  • Iterate: Update your knowledge base and responses based on real conversations.

  • Integrate: As your needs grow, connect your chatbot to other channels (WhatsApp, Facebook Messenger) or tools (CRMs, calendars).


Common Use Cases for Website Chatbots

  • Customer Support: Answer FAQs, troubleshoot issues, and reduce support tickets.
  • Sales & Lead Generation: Qualify visitors, collect contact info, and book meetings.
  • E-commerce: Guide shoppers, recommend products, and handle order questions.
  • Onboarding: Help new users get started with your product or service.
  • Internal Helpdesk: Assist employees with HR, IT, or policy questions.

Video Tutorial

Prefer to watch? Check out our step-by-step video guide:

Watch on YouTube


Frequently Asked Questions

Is it really free?
Yes! Optimly offers a generous free plan—no credit card required.

Can I use my chatbot on any website?
Yes, just copy and paste the embed code into any site (WordPress, Wix, Shopify, custom HTML, etc.).

Can I connect to WhatsApp or other channels?
Absolutely! Optimly supports multi-channel integrations.

Do I need to know how to code?
Nope. Everything is point-and-click.


Limitations and Best Practices

  • AI is not perfect: Your chatbot may occasionally misunderstand or give a generic answer. Regularly review conversations to improve accuracy.
  • Privacy: Don’t use your chatbot to collect sensitive information unless you have proper security and compliance in place.
  • Escalation: For complex or sensitive issues, provide a way for users to reach a human.
  • Continuous improvement: Treat your chatbot as a living project—update it as your business and customer needs evolve.

Get Started Free with Optimly

Ready to build your first AI chatbot? Sign up free and launch in minutes!

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How to Use Your Agent’s Access Token in Optimly

· 2 min read
CEO @ Optimly

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Introduction

Every agent you create in Optimly comes with a unique access token. This token is your key to unlocking integrations, automations, and direct API access—giving you the power to connect your agent to any workflow, app, or platform.


🎬 Watch the Full Video Guide

Prefer to learn visually? Watch our step-by-step tutorial on YouTube:

How to Use Your Agent’s Access Token in Optimly

This video covers everything in this article, with live demos and extra tips for developers and business users.


Where to Find Your Access Token

  1. Log in to your Optimly dashboard.
  2. Select your agent from the list.
  3. Look for the token icon or the Integrations tab—your access token will be displayed there.

Tip: Each agent has its own token. Keep it secure and never share it publicly.


Three Ways to Use Your Agent

1. Test Interface

Use the built-in test console inside the agent dashboard to simulate conversations and see real-time responses.

Share your agent with anyone using its public page. Find the link in your dashboard and send it to teammates or customers.

3. Third-party Integration

Go to the Integrations tab in your agent’s settings. Choose your preferred format:

  • Website embed: Copy the provided code snippet and paste it into your site.
  • React app: Use the ready-to-go config for React projects.
  • WhatsApp & more: Follow the guided steps for messaging platforms. The access token is already included in the config.

Direct API Access

For full control, you can call the Optimly API directly. Just include your agent’s access token in the Authorization header:

curl -X POST https://api.optimly.io/v1/agents/{agent_id}/message \
-H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
-H "Content-Type: application/json" \
-d '{"message": "Hello!"}'

Check the Optimly API docs for more endpoints and usage examples.


Integration Guides & Advanced Use Cases


Best Practices & Security Tips

  • Keep your token secret. Never expose it in public repos or client-side code.

  • Rotate tokens if you suspect compromise.

  • Use environment variables for server-side integrations.

  • Authentication Guide: API Authentication

  • Security Best Practices: Website Integration Security


Support & Community


Conclusion & Next Steps

Your agent’s access token unlocks powerful integrations and total flexibility. Ready to build? Read the docs or create your first agent today.

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