SiYuan vs Standard Notes

SiYuan is a personal knowledge management system for building a linked collection of notes. It supports Markdown, block-level references and bidirectional links, and organizes content into blocks with more than 20 block-level and more than 10 span-level element types. Backlinks can be filtered and searched; relationship graphs are available across a notebook and at block level. Databases support relations, rollups and templates, while flashcards use the FSRS spaced-repetition algorithm. Its AI feature connects to OpenAI for writing continuation, translation, summaries, brainstorming and grammar or spelling corrections. SiYuan supports offline access, and the maker describes multi-device synchronization as incremental and end-to-end encrypted. It is available on Windows, macOS, Linux, iOS, Android and the web, with a Chrome/Edge extension, API and Docker self-hosting. The maker says data stays under the user's control on their device. Free access is free; PRO Features is listed at $64 a month with lifetime-use wording, and Subscription at $148 a month with 8GB cloud storage.

Standard Notes is a note-taking app for keeping notes across web, Windows, macOS, Linux, iOS, and Android, with offline access. Its free Standard plan includes end-to-end encryption, unlimited device sync, plain-text notes, tags, and two-factor authentication. Notes can be shared, though real-time collaboration is not supported. The Productivity plan costs $90 per year and adds Markdown and rich-text editing, checklists, code snippets, spreadsheets, folders, a web clipper, and one year of note revision history. Professional costs $120 per year and includes 100 GB of storage and up to five accounts. Listed integrations are Evernote, Google Keep, and Aegis. Standard Notes is open source. Its maker was founded in 2016 and is headquartered in Chicago, Illinois.