According to AlphaMoat, in 2026-09 the AI app Obsidian saw 144,782 downloads over the last 30 days — ranked #471 of 2,900 AI apps, and #23 of 201 in Office & Collaboration; its top market is United States (13.8% of downloads).
What is Obsidian
Obsidian is a personal knowledge base that works on top of a local folder of plain text Markdown files, described by its developer as a second brain that is now available on Android. Notes stay in ordinary files rather than a proprietary format.
- 01A customizable toolbar and pull-down quick actions
- 02graph view for seeing how notes connect to each other
- 03sharing into and out of Obsidian
- 04community plugins for extending the app
- 05themes for changing its look
- 06sidebar pinning on tablets
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Data month: 2026-09 · Downloads and in-app purchase revenue are third-party estimates (trailing 30-day window), aggregated monthly. Revenue covers App Store and Google Play in-app purchases (including subscriptions) only — excluding Android app stores in mainland China and other payment channels such as web subscriptions. See methodology.