Memex

Memex is an open-source AI journal app designed for iOS and Android, focusing on privacy and local-first data storage. It enables users to capture text, photos, voice notes, reminders, and daily fragments, automatically organizing these entries into structured timeline cards using a multi-agent AI system. The platform is intended for individuals seeking a private and intelligent way to manage their personal records and gain insights from their daily activities.

The app supports multi-modal recording, allowing users to input text, photos, and voice in a single flow, with features such as long-press audio recording, auto EXIF extraction, on-device OCR, and image labeling. Memex’s AI agents categorize records into various types of timeline cards, including tasks, events, metrics, people, places, galleries, articles, and transactions, among others. Its insight engine surfaces patterns across entries as trend charts, radar maps, timelines, highlight quotes, composition breakdowns, and narrative summaries, helping users discover connections and trends they might not have noticed otherwise.

All records are stored locally as interconnected Markdown files and a local SQLite database, ensuring data portability and zero vendor lock-in. Users can export their data with one click and back up or sync via iCloud Drive, a custom folder, or app storage. Memex operates on a bring-your-own-LLM model, supporting connections to more than a dozen large language model providers, such as OpenAI, Claude, Gemini, Ollama, and others. Prompts are sent directly from the device to the chosen provider, and the platform does not access user data or API keys. Users can also build custom AI agents within the app, leveraging event-driven triggers, custom prompts, JavaScript execution, and inter-agent workflows, all running on their device.

0 license and is available through the App Store, Google Play, and GitHub. Its open-source nature and local-first approach make it distinct among journal apps, offering privacy-conscious users control over their data and AI integrations.