FLwatch: Glucose Sensor Graph

FLwatch: Glucose Sensor Graph

Insulin On Board + Activity

33 ratings
36 reviews
Free
In-App Purchases

Details

  • Released
  • Updated

Features

FLwatch: Glucose Sensor Graph screenshot #1 for iPhone
FLwatch: Glucose Sensor Graph screenshot #2 for iPhone
FLwatch: Glucose Sensor Graph screenshot #3 for iPhone
FLwatch: Glucose Sensor Graph screenshot #4 for iPhone
FLwatch: Glucose Sensor Graph screenshot #5 for iPhone
FLwatch: Glucose Sensor Graph screenshot #6 for iPhone
FLwatch: Glucose Sensor Graph screenshot #7 for iPhone
FLwatch: Glucose Sensor Graph screenshot #8 for iPhone
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About

Visualize blood glucose readings from compatible sensors on your iPhone and Apple Watch. Track insulin doses, view insulin-on-board and activity graphs, and integrate data with Apple Health for comprehensive diabetes management.

Blood glucose graph on iPhone and Apple Watch
Insulin on Board (IOB) calculation
Insulin activity graph
iOS Home Screen and Lock Screen widgets
Live Activities for quick glucose updates
CarPlay support
Export to Apple Health
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What's New in FLwatch

2.3.0

May 28, 2026

* completing Dexcom Share support * other small bugfixes

4

In-App Purchases

$4.99

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User reviews

Great looking app but it eats battery charge!

I installed this app two days ago and have to say that initially I was very impressed. Really nice graphics and faultless operation. After 24 hours it became apparent that both phone and watch battery charge levels were being badly impacted. Another 24 years on and the iPhone battery app reports over 50% usage by the FLwatch app.
I have reverted to SweetDreams app which functions the same but only uses a few percent in the same time. Real shame. 😞

Update. After a rebuttal from the writer, I reinstalled the App just to find that it screws battery life just as bad as before. Over 60% of my battery consumption was the FL Watch app on the first day. Needless to say I’ve removed it again.
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Response from developer

Thanks for taking the time to leave feedback and for trying FLwatch. FLwatch is a free and open-source project that I develop in my spare time to help the diabetes community. I genuinely appreciate bug reports, feature suggestions, and constructive criticism, because they help improve the app for everyone. That said, some limitations are outside of the app’s control — especially regarding iOS/watchOS background updates, widget refresh frequency, and battery usage, which are heavily restricted by Apple’s system policies and can vary significantly between devices and configurations. I always try to improve performance, reliability, and battery efficiency whenever possible. If something is not working as expected, please consider reaching out through the project channels with details about your setup so issues can be investigated properly. Thank you again for your support, patience, and understanding.

A Very Underrated App, IMO

There are other Glucose apps, which charge for live activities not nearly as accurate and helpful as FLwatch. I started using this when I still had an Apple watch which I’ve since ditched because of the inexcusable battery life. Still use on my iPhone and the Live Activities update with my Librelink app immediately. Thank you for a great app with both privacy and great performance.
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Response from developer

Thank you so much for your kind words and for taking the time to leave such a thoughtful review! I’m really happy to hear that FLwatch continues to be useful for you, even after switching away from the Apple Watch. It’s especially great to know that the Live Activities and LibreLink updates are working well for you. FLwatch is a free, open-source project that I develop in my spare time, so feedback like yours means a lot. Reviews like this are not only a huge motivation to keep improving the app, but they also help increase its visibility in the App Store, making it easier for other people with diabetes to discover it. Thank you again for your support and for being part of the FLwatch community. Wishing you all the best and stable glucose readings!

Works great

This app does what Libre 3 is too lazy to do, it talks to my Apple Watch! Yay! Now I have to figure out why it won’t talk to Apple Health.

Response from developer

Thanks for the review. Maybe some missing permissions for Apple Health? Please send an email to support if the problem persists.

Top

This is exactly what the Abbot app is missing. Thank you very much for working on this!

Usefull

This app is great. It brings functionality that Freestyle should really supply via their app. Well done and thanks

Response from developer

Thanks. Glad it helps! 😊

Developer apps

FAQ

What does FLwatch do?

FLwatch displays blood glucose readings from Abbott FreeStyle Libre 2 and Libre 3 sensors on your iPhone and Apple Watch. It also allows you to record insulin doses and visualize insulin-on-board and insulin activity with dedicated graphs, aiding in understanding glucose and insulin interactions.

What are the key features of FLwatch?

Key features include a blood glucose graph on iPhone and Apple Watch, insulin on board (IOB) calculation, insulin activity graphs, iOS widgets, Live Activities, Apple Watch integration, and CarPlay support. It also allows for exporting data to Apple Health.

Is FLwatch free to use?

Yes, FLwatch is free and open source. There are no costs associated with using the app or its features.

What devices is FLwatch compatible with?

FLwatch is designed for Apple devices, including iPhone and Apple Watch. It utilizes LibreLinkUp cloud for data and offers integration with CarPlay and Apple Health.

How can FLwatch help with diabetes management?

FLwatch supports daily diabetes management by providing constant visibility of glucose data through graphs and widgets on your Apple devices. The insulin tracking features help users understand the interplay between insulin and glucose levels, complementing their existing monitoring systems.