PebbleOS - Changelog

Looking for the Pebble mobile app changelog?

What’s new in PebbleOS?

| June 4, 2026 | PebbleOS v4.11.0 | - Added speaker volume control

Health units now match SI symbols
LECO font supports all ASCII characters
Quick launch button/action are now exposed to apps
New Moddable debug flag exposed in SDK
Many small bug fixes/improvements
New release version scheme: we will increase minor field by default (v4.11.0, v4.12.0...) and reserve the patch field for fixes until next minor public release | | --- | --- | --- | | May 28, 2026 | PebbleOS v4.9.183 | - Alarm sounds (default vibe only)
Low power watchface now also shows the date
Notifications can now choose between bold or non-bold status bar
Allowing Touch during Quiet Time is now toggable
Cleaned up Quiet Time Settings
Improved Italian translation (Thank you blu8!)
Add large-bold clock mode
Drop HRM events when queue is full
Attempt to fix some BLE related crashes for some iOS users
Add watchface squish options
Fix all the small things
Improve guarding against fake ANCS/AMS services causing crashes
Various bug fixes that we are not going to type out one by one haha | | May 20, 2026 | PebbleOS v4.9.178 | - PT2/PR2 now run with MPU (Memory Protection Unit) enabled, effectively sandboxing applications/watch faces.
Major security/syscall hardening pass. A few issues where applications could gain kernel-level access have been fixed (thanks, Liam, for the initial report).
Updated translations, and some are now built-in (English, Catalan, German, Spanish, French, Italian, Dutch, and Portuguese).
Multiple tiny UI improvements
Added optional native hourly and disconnect vibrations.
Improvements to the audio capture pipeline.
Improved metrics that allow us to diagnose problems better (connectivity, crashes, etc.)
For developers: The QEMU emulator can now run with decorations, so it looks like the real watches on desktop. | | May 8, 2026 | PebbleOS v4.9.175 | - Speculative fix for an annoying Bluetooth issue causing disconnects and bad battery life on PT2
Low power mode is now entered at 4% (was 2%)
Adjust PT2 to a warmer default backlight colour (#FFBFA2)
Improved OOM handling on nRF5 microphone driver
Fixed bug in compositor App-to-App transition rendering
Simple dialog now center contents
Some adjustments to ambient light sensor sampling (related to backlight)
New 'Gentle' alarm vibe pattern (thanks @cvuorinen!)
Standby mode threshold has been reduced, it was causing spurious BT disconnections
Speaker mute control (global and during quiet time)
Fix Touch in left-hand mode
Apps can now react to the backlight turning on/off (pending new SDK release)
iOS notification filter rules are now supported
Speaker tones sound more balanced across pitches
Square-wave speaker tones sound cleaner, less buzzy
Heart-rate recovery tracking starts automatically when a workout ends
Heart-rate monitor no longer keeps running longer than an app asked for
Arabic text lays out and truncates correctly
Better handling of invisible/formatting characters in text
App crashes from divide-by-zero no longer take down the watch
Small visual glitch fixed when dismissing an alarm | | April 30, 2026 | PebbleOS v4.9.171 | - Added Speaker API in the public SDK (notes, tracks, PCM streaming)
Raised app limit to 1MB
Added Touch API in the public SDK
Added Display → Touch toggle
Changed ‘Wake on touch’ to support Off / Double Tap (default) / Tap
Added new emojis (Thanks to the many artists and @Krazer89 for the PR!)
Improved backlight settings UI
Fixed backlight brightness scaling
Improved low power behaviour when watch is stationary
MAJOR qemu overhaul 4.x → 10.x!
Fixed task CPU tracking overflow that could affect battery/crash analytics
More PT2/PR2 fixes and improvements | | April 22, 2026 | PebbleOS v4.9.163 | - Fixed ‘Dictation not available’
Fixed an infinite disconnect/connect loop on iOS
Watchface will redraw automatically if changing time format 12/24h
Restored some missing glyphs in Emoji fonts
Adjusted TicToc watchface for Gabbro (Thanks hellcp!)

PT2

Default PT2 to ‘Medium’ backlight intensity and motion sensitivity to lower power consumption
Added new 'Touch to backlight' option (this will change from single tap to double tap in future version FYI)
Fixed 🤞major crash that was sucking battery power | | April 17, 2026 | PebbleOS v4.9.157 | - Added toggle to disable Health (saves battery life if you aren’t using it)
Fixed major bug that caused some watchfaces showing seconds to tick too fast
Improved PT2 UI (Weather, Workout apps, etc)
Fixed vibration levels on PT2
Fixed more DST issues
More bug fixes! | | March 26, 2026 | PebbleOS v4.9.152/153 | - Major work on reducing PT2 power consumption (roughly 20 day average now)
Added settings menu to set date/time manually from the watch (woah, finally!)
Revamped heartbeat analytic metrics to help with power consumption investigations
Added LECO60 font
Bilinear scaling as an alternative option to NN
Added option to disable motion backlight during quiet time (thanks @hexxeh!)
Added support for Hebrew text rendering
Fixed issues with re-subscription failing in ANCS
Periodic heart rate sampling can now be adjusted (default 10 mins)
Removed Rocky.js (RIP)
Updated to upstream Moddable (7.2.1)
Fixed a TON of crashes on PT2
PT2 UI tweaks
PT2: Added wear detection support for HR sensor, disabled SpO2 sampling (for now)
Fixed modal animation on emery emulator
Add bilinear scaling as an option (vs NN)
Add new toggle to disable HR on detected activities (eg walk/run)
Fixed issue where watch would not be discoverable after BT airplane mode toggle | | March 4, 2026 | PebbleOS v4.9.135 | - Per-segment amplitude control of vibes in public SDK (external)
New combo back+up for quick launch
Fixed left-handed mode not working on low-power mode
Reverted tick service workaround causing some apps to be slower
Resolved an issue with asserts causing infinite reboot loops
Resolved some issues with the nRF fuel gauge (e.g., init while charging)
Resolved some issues with the watchdog not triggering in some cases
Fixes some random BLE crashes due to insufficient ACL buffer count | | Feb 23, 2026 | PebbleOS v4.9.127 | - Moddable engine 🎉
Improved appearance of the health screen (back to the rhombus)
Fix deadlock in PPoGATT path
Fixed dismissed notification not removed from list
Remove inconsistent menulayer height
Simplify custom colouring in settings
Fix animation origin for dialogues | | Feb 18, 2026 | PebbleOS v4.9.125 | - Added RTL text support (e.g. Arabic and Hebrew) (Thanks EladDv and Ahmed!)
Use large icons on phone call UI
Added H/M/+ glyphs to LECO36
Experimental support for building on Nix | | Jan 31, 2026 | PebbleOS v4.9.121 | - New app icons for reddit and a few others (thanks @saltedlolly!)
Fix for smart alarm not firing
Fix for major deadlock issue on Pebble 2. Duo that caused a lot of crashes
Added Timeline app in menu (thanks @MrXANA91!)
Added right-hand orientation in Display settings (Claudio’s first feature!) | | Jan 26, 2026 | PebbleOS v4.9.111 | - Support for Settings sync between watch and phone app
Support for iOS custom notification icons, vibration patterns, and colors (thanks @asyba!)
Various Bug Fixes and Improvements | | Jan 13, 2026 | PebbleOS v4.9.108 | New Features
Toggle if backlight turns on during notifications
New Distance Unit setting to choose preferred measurement units
Support for custom vibration patterns
Added Youtube, Signal, and Twitch Icons for notifications

Improvements

Improved Bluetooth reliability
Improved battery life (Time 2)
Improved display rendering (Time 2) | | Dec 12, 2025 | PebbleOS v4.9.100 | New Features
Notification vibe timing setting: Choose to vibrate at beginning or end of notification animation
Added new notification icons (Discord, Beeper, etc)
Custom Vibration Patterns per App!

Bug Fixes

Fixed Bluetooth issue that could cause the watch to reset into recovery
Fixed incorrect daylight saving time in some timezones
Fixed sleep tracking being too sensitive to movement | | Dec 1, 2025 | PebbleOS v4.9.91 | New Features
Quiet Time Settings: Added "Notifications" toggle option to control notifications during Quiet Time
Notification Timeout: Added 30-second option to notification timeout settings
Health: Replace health nag with one-time insights onboarding prompt
Sleep Tracking: Now displays yesterday's sleep data if today's is not yet recorded
Activity Thresholds: Decreased sleep notification trigger thresholds
ANCS Recovery: Auto-recover from lost ANCS (Apple Notification) subscriptions
Banking Apps: Added European neobanks to ANCS notification handling
Phone Calls: Use proper resource for iOS Phone app during calls

Bug Fixes

Fixed transition animation for settings
Fixed Low Power Mode not exiting when charger is connected
Fixed use-after-free bug in voice reply | | Nov 26, 2025 | PebbleOS v4.9.88 | - Added support for left-handed UX (Thanks Claudio!)
Weather and Reminder apps are now enabled (pending app support) | | Nov 17, 2025 | PebbleOS v4.9.83 | - Added single-click quick launch options
Fixed issues for users in the Eurpoe/Dublin Timezone
Added some logs to help find issues with ANCS. Having notification issues on iOS? Please update to this version and report if they continue. | | Nov 6, 2025 | PebbleOS v4.9.76 | - Adjusted low power shut down to 2%
Adjusted battery capacity (~400h) so ‘1 day battery left’ warning should be more correct
Disabled old 'welcome' message
Enforce single phone pairing
Sizes for Flint have been increased in SDK
Fixed crash when pairing a new phone
Fixed issues with alarm popup dismiss | | Oct 24, 2025 | PebbleOS v4.9.71-stop0 | - Improved responsiveness of voice input- Fix Notifications not opening in notifications app- Ensure sleep and step tracking work on first boot |

What should work in PebbleOS for Pebble 2 Duo🤞

Time
Notifications
- dismissing notifications on phone from watch
- (Android only) replying with emoji or canned replies
Calendar (configure in mobile app, no actions or invites yet)
Music control
Compass
Voice input
Phone calls
Alarms
All settings (vibration, quiet time, 12/24hr, etc)
Watchfaces
Apps
Appstore and locker (via Rebble.io sign in)

What isn’t working or built yet 🤦

Battery life on on Pebble 2 Duo is not fully optimized yet. Expect 10-14 days of battery life. Soon we’ll optimize it for 30 days of battery life with a firmware upgrade.
Backlight strength controlled by ambient light sensor
Speaker and barometer on P2D
Send Text app

⚠️ How to troubleshoot and fix Pebble 2 Duo problems ⚠️

Full changelog

Oct 20, 2025	PebbleOS v4.9.65-stop0	- Longer battery life, up to 14 days are expected!
Oct 8, 2025	PebbleOS v4.9.63	- Improved microphone recording quality- Fixed some boot time crashes while the file system was being setup- Further refinements to accelerometer failure handling- Improved display data transfer performance- New backlight toggle application- Serial console is now disabled by default on release builds.
Oct 2, 2025	PebbleOS
v4.9.9-core59	- Add ambient light threshold setting

Some more accelerometer tweaks | | Sept 26, 2025 | PebbleOS v4.9.9-core57 | - Fix issue where steps and sleep were not counted correctly | | Sept 22, 2025 | PebbleOS v4.9.9-core52 | - Increase microphone gain and implement automatic gain control
More Accel fixes for backlight triggers | | Sept 17, 2025 | PebbleOS v4.9.9-core47 | - Fixed issue that caused accelerometer to stop detecting steps/sleep/wrist movement | | Sept 9, 2025 | PebbleOS v4.9.9-core45 | - Updated time zone database
Improved accelerometer overall stability
Experimental support for magnetometer
Fixed issues with time sync causing health data loss.
Multiple minor fixes for reported issues (e.g., calendar reminder issues) - Keep reporting! | | | PebbleOS v4.9.9-core35 | - Some accelerometer improvements/fixes (e.g., spurious shake events)
Standby mode is now enabled by default.
Fixed some BLE issues related to GATT notifications. | | | PebbleOS v4.9.9-core33 | - Initial experimental accelerometer support (feedback welcome!) - Thanks Matthew Wardrop for the initial work and testing!
Enabled the ‘Workout’ app.
Fixed some crashes when the microphone was being used.
Decreased logging verbosity as it seems to cause stability issues in some scenarios. | | | PebbleOS v4.9.9-core32 | - Initial microphone support (not yet in mobile app)
Fixed some mobile app reconnect issues on iOS.
Potentially fixed some crashes caused by recently increased logging. | | | PebbleOS v4.9.9-core31 | - Fixed issues with ANCS (iOS) being unreliable.
Adjusted BLE advertising parameters (follows Apple accessory guidelines)
Adjusted BLE connection parameters. This should potentially fix some connectivity issues observed in the field.
Watch now detects BLE service changes, so it can rediscover if needed (e.g., if the app crashes or is updated).
Fixed occasional crashes when toggling airplane mode.
Removed “airplane toggle” workaround during service discovery as root cause has been fixed.
Implemented BLE CCCD persistence
Improved logging in a few areas so we will now catch more details on new/existing issues. | | | PebbleOS v4.9.9-core22 | - Fixed issue where ‘Fully Charged’ popup could appear after partially charging the battery.
BLE repeat pairing is now supported. | | | PebbleOS v4.9.9-core21 | - Fixes issues with reported/notified values with BLE BAS service
Other minor charging current tweaks | | | PebbleOS v4.9.9-core19 | - Watch exposes GATT Battery Service; the mobile app will now report the watch battery level.
Battery model has been adjusted to potentially resolve some issues like the percentage stuck at 100%.
PMIC will now handle charging fully discharged batteries.
Added extra logging for battery constants and connectivity actions so we can collect more metrics from devices in the field.
Notifications now have an alternative design option. | | | PebbleOS v4.9.9-core18 | Bluetooth workaround - auto-cycle airplane mode if service discovery fails | | | PebbleOS v4.9.9-core17 | Battery life improvements - should get ~4 days battery life now! | | | PebbleOS v4.9.9-core14 | Battery % now shows actual %, rather than just 10% chunks. | | | PebbleOS v4.9.9-core13 | Fixes Bluetooth stability issue with core12, but reverts some battery life improvements (back to ~1 day battery life) |