Release record
Release notes
Editorial synthesis with inline references and a source ledger when citations are available.
Source ledger
Sources are linked to the claims they support. Publication and access dates are shown when available.
Apple Support · Apple · 2023-11-02T00:00:00.000Z · iOS 15.1 and iPadOS 15.1 — Released October 25, 2021
Documented & observed
Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.
Release changes
Features, fixes, removals, and regressions first observed in this release record.
security · fixed
Apple’s advisory records multiple CVE-tracked fixes in the October 25 release.
Recorded at Public
feature · introduced
The public update enabled synchronized playback, shared controls, smart volume, and screen sharing in FaceTime.
Recorded at Public
feature · introduced
iOS 15.1 added ProRes video capture on iPhone 13 Pro and iPhone 13 Pro Max.
Recorded at Public
enhancement · changed
The update expanded verifiable health-record use and translation language coverage.
Recorded at Public
Milestones
Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.
Developer beta
Developer beta
Developer beta
Developer beta
Release candidate
Public release
iOS 15.1 reached the public release channel on October 25, 2021. iOS 15.1 delivered the delayed SharePlay experience and expanded camera, health-record, translation, and Home capabilities. This article records the public appearance only and does not attribute cumulative notes to an earlier beta.
Historical context
Pace, intervals, and duration compared with earlier releases on the same platform.
Historical avg for .1 releases
48 days, 5.2 milestones
Based on 20 previous iOS .1 releases
Cycle vs. platform average
34d (avg: 58d)
24 days shorter than the iOS average
Duration ranking
#78 of 92
Middle of the pack iOS beta cycles
Longest gap in this cycle
8 days
Between Beta 2 and Beta 3