AI · alternatives · 2026

24 alternatives to Open-Source ChatGPT

Build a chatbot for your own data with open source LLM

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Open-Source ChatGPT launched in 2023; newer entries below may have overtaken it.

1
CustomGPT▲538
Build your own ChatBOT
2023 · its alternatives →
2
ChatGPT▲1,647
Optimizing language models for dialogue
2022 · chatgpt.com · its alternatives →
3OS
Open source alternative to ChatGPT and ChatPDF-like AI tools▲234
Hey everyone, We have been building SecureAI Tools -- an open-source application layer for ChatGPT and ChatPDF-like AI tools. It works with locally running LLMs as well as with OpenAI-compatible APIs. For local LLMs, it supports Ollama which supports all the gguf/ggml models. Currently, it has two features: Chat-with-LLM, and Chat-with-PDFs. It is optimized for self-hosting use cases and comes with basic user management features. Here are some quick demos: * Chat with documents using OpenAI's GPT3.5 model: https://www.youtube.com/watch?v=Br2D3G9O47s * Chat with documents…
2023 · github.com · its alternatives →
4
GPTs by OpenAI▲300
Create your own ChatGPT
2023 · its alternatives →
5
ChatbotGPT▲123
Custom ChatGPT agents with your own data
2023 · its alternatives →
6
Dolly▲113
Democratizing the magic of ChatGPT with open models
2023 · its alternatives →
7
Hugging Chat▲374
The first open source alternative to ChatGPT
2023 · its alternatives →
8
ChatGPT Plugins▲357
Open AI announced ChatGPT Plugins to access real-world data
2023 · its alternatives →
9IB
I built a free in-browser Llama 3 chatbot powered by WebGPU▲547
I spent the last few days building out a nicer ChatGPT-like interface to use Mistral 7B and Llama 3 fully within a browser (no deps and installs). I’ve used the WebLLM project by MLC AI for a while to interact with LLMs in the browser when handling sensitive data but I found their UI quite lacking for serious use so I built a much better interface around WebLLM. I’ve been using it as a therapist and coach. And it’s wonderful knowing that my personal information never leaves my local computer. Should work on Desktop with Chrome or Edge. Other browsers are adding WebGPU support as well - see…
2024 · github.com · its alternatives →
10
CodebaseChat▲207
Create a GPT chatbot for any GitHub repo in just 30 seconds
2023 · its alternatives →
11
Suportal for Devs▲99
Custom ChatGPT for your website - using your own API Key
2023 · its alternatives →
12
Chat Interface for OpenAI Assistants▲119
ChatGPT-like customer interactions in a website widget
2024 · its alternatives →
13
nanochat▲349
Build your won ChatGPT for $100 on a single GPU
Oct 2025 · github.com · its alternatives →
14
ChatNode▲200
Train ChatGPT on your own data, in seconds
2023 · its alternatives →
15
Chatgot▲214
Chat freely, got every AI assistants here for you
2023 · its alternatives →
16
Databerry.ai▲208
Build a ChatGPT plugin in minutes
2023 · its alternatives →
17
AnswerFlow AI▲155
Build unlimited custom ChatGPT bots, with a lifetime license
2023 · its alternatives →
18
Lemonfox.ai▲157
The fast, easy and cheap OpenAI alternative
2023 · its alternatives →
19
Instant Answers▲88
Custom ChatGPT with your data on your website
2023 · its alternatives →
20
Libraria▲86
Create and embed custom AI assistants
2023 · its alternatives →
21
ChattyUI▲149
Run open-source LLMs locally in the browser using WebGPU
2024 · its alternatives →
22
Chat Thing▲115
ChatGPT chatbots with your own data (Notion, Web & Files)
2023 · its alternatives →
23
ChatGPT Plugin Builder▲143
Build ChatGPT plugin w/ your own websites and docs—in mins
2023 · its alternatives →
24
Chatpad AI▲142
Not just another ChatGPT user-interface
2023 · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →