Apps similar to Thunderbolt include Jan.ai, which is free and open source. Other options are GPT4ALL, AnythingLLM, Alpaca - Ollama Client and Secret Llama. There's no shortage of AI Chatbots like Thunderbolt, with more than 50 alternatives for Mac, Linux, Windows, the web and iPhone.
Open-source offline AI platform supports local LLMs including Llama, Gemma, Qwen, GPT-oss, integrates cloud services like OpenAI and Anthropic, enables custom assistant creation, offers OpenAI-compatible API on localhost, operates across diverse hardware and ensures privacy.
Singapore
Locally runs open-source chatbots focused on privacy using consumer CPUs, requiring no internet or GPU. Supports multiple models, custom settings, code and dialogue generation, integrated model downloader, familiar chat UI, and both MIT and enterprise licensing.
United States
Open-source privacy-focused chatbot platform allowing unlimited document uploads, multi-user and single-user modes, AI-powered chat with documents, vector database and LLM compatibility, customizable interface, message history, secure desktop deployment, and full user controls.
United States
Alpaca is an Ollama client where you can manage and chat with multiple models, Alpaca provides an easy and begginer friendly way of interacting with local AI.
Costa Rica
Runs fully private, offline chatbot entirely in browser, ensuring conversation data never leaves the device. No server, installation, external services, or account needed. Supports Llama 3, Mistral, and other open source models in a ChatGPT-like interface for privacy-focused users.
Poe is a web-based AI platform that hosts multiple assistant bots—including Claude and various GPT and image/audio models—to provide conversational Q&A, image and audio generation, and automated AI workflows.
United States
The self-improving AI agent built by Nous Research. It's the only agent with a built-in learning loop — it creates skills from experience, improves them during use, nudges itself to persist knowledge, searches its own past conversations, and builds a deepening model of who...
United States
An open-source platform for seamless automation in engineering tasks, providing local execution and control. Customizable with any LLM for enhanced autonomy, enabling developers to efficiently handle debugging to deployment tasks while preserving privacy.
United States
Lightweight AI assistant runs in Apple containers with isolated Linux container processes for superior OS-level security, transparency, and privacy compared to complex chatbots, enabling quick code review, easy customization, and minimal dependencies for all users.
Access Apple’s local foundation model through a command-line tool with an OpenAI-compatible HTTP server, full function and schema calling, UNIX-friendly features, file attachments, JSON output, privacy-preserving on-device inference, and zero recurring costs.
Austria
EU
