BYOAIK — Bring Your Own AI Key: a directory of AI tools that run on your own API key.

SiYuan

Privacy-first, self-hosted block-based knowledge base with built-in AI writing and Q&A via your own API key.

Website Source code

Category:

Writing Tools

Pricing:

Open Source

Open source:

Yes (AGPL-3.0)

Self-hostable:

Yes

Local-first:

No

Platforms:

Desktop, Mobile, Self-hosted, Web, Docker

AI providers (bring your own key):

OpenAI, Azure OpenAI, Custom / OpenAI-compatible

API key storage:

Stored locally on device

Key risk level:

LOW

Trust score:

85/100

SiYuan is an open-source, privacy-first personal knowledge management application built around block-level editing, bidirectional links, databases, and spaced-repetition flashcards. It runs fully self-hosted (desktop, mobile, and Docker/web) with local-first data storage. Its built-in AI writing and Q&A features (writing continuation, translation, grammar correction, chat) are powered by the end user's own credentials: Settings → AI lets you choose an API Provider (OpenAI or Azure), and enter your own API Key, API Base URL ("the URL of the OpenAI-compatible API"), and API Model. Because the base URL is user-configurable, any OpenAI-compatible endpoint works (DeepSeek, OpenRouter, local/self-hosted models via a compatible gateway, etc.).

How your API key is handled

Your API key is stored locally on your device. Requests are sent directly to the AI provider. Because it can be self-hosted, your key never has to touch a third-party backend.

Setup

Open settings, paste your provider API key, choose a model, and start — the key stays on your device.