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 app offers local or cloud AI chat with major LLMs, advanced semantic search, automation, personal newsletters, document indexing, image generation, and text-to-speech. Access from web, Obsidian, Emacs, desktop, mobile, or messaging platforms.
India
Self-hosted AI workspace offering chat, tool use, and autonomous agent support. Enables email and research tasks securely on user hardware, keeps all data local, requires no external servers, and provides customizable AI workflows for privacy-focused environments.
Japan
Privacy-first local AI agent automates web and app workflows without cloud reliance, installs in 30 seconds, supports local and API-driven models, features browser automation, self-coding Node.js tools, native integrations, and stores all data locally.
Austria
EU
Together Chat is a next-generation consumer app designed to let you interact seamlessly with today's most popular open-source models, including free access to DeepSeek R1, securely hosted in the North America.
United States
Maid is a cross-platform Flutter app for interfacing with GGUF / llama.cpp models locally, and with Ollama and OpenAI models remotely.
Customizable interface for private, on-device AI model chatting, open source and closed source LLM connections, OpenRouter support, custom backend support, and unified access to language models without reliance on a single provider, ensuring privacy and flexibility.
United States
LlamaGPT is a chatbot that provides a ChatGPT-like experience, with no data leaving your device.
The simplest way to use private LLMs: Works fully offline and private when you don’t have internet. Runs models on-device optimized for Apple silicon.
United States
Ask questions to your documents without an internet connection, using the power of LLMs. 100% private, no data leaves your execution environment at any point. You can ingest documents and ask questions without an internet connection!
GermanyEU
Open-source AI assistant builds interactive chat interfaces with elements like buttons, forms, and tables, delivers over 40 tools, supports 24 AI services, local models for offline use, encrypted chat history, no ads, free usage, and privacy by design.
GermanyEU
Complete LLM chatbot implementation, offering tokenization, pretraining, finetuning, evaluation, inference, and a simple web UI. Runs on a single 8xH100 node, features a hackable codebase, dependency-lite design, and automates the full workflow via scripts.
United States
Deeply customizable virtual assistant offering flexible AI model support, voice chat, document interaction, web search, file and conversation management, extension integration, and a unified interface for organizing productivity and personal workflows.
