What is an app update changelog?

Every time an app ships a new version, the developer publishes release notes describing what changed. We collect these from Apple and Google every 4 hours and aggregate them across all tracked apps.

Can I see release notes for past versions?

Yes - every version page (/apps/[platform]/[slug]/[id]/versions/[version]) shows the full release notes for that version, plus a side-by-side diff against the previous version at /diff.