OpponentBook is a private journal for individual-sport athletes: log matches, keep notes on everyone you face, and pin tactics directly on the piste, table, court, ring or mat. Each pin links to the exact second in your match video.
Your notes live on your own Google Drive, Dropbox or iCloud, not on our servers, so we can't read them. 17 sports and 21 languages, with a generous free tier. Premium, Pro and Max add stats, heatmaps and AI briefs based on your own notes.
OwnJournal is a zero-knowledge journaling app that keeps your entries in storage you own — never on our servers. Everything is encrypted on your device before it syncs. Open source under AGPL-3.0, built in Sweden under EU law. Free tier, or $19.99/year for Plus. iOS, Android and web, in 21 languages.
