Comparison

nightguard vs FLwatch

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

nightguard

Monitor blood glucose levels from your Nightscout backend. Receive alerts for out-of-range values, track historical data with overlay charts, and tune basal rates with statistics. Optionally sync data to Apple HealthKit.

Highlights
  • Blood glucose value display
  • Customizable glucose range alerts
  • Alert snoozing and reactivation
  • Rapid rise/fall alerts
  • Historical overlay charts
  • Basal rate tuning statistics
  • HealthKit data sync
Features
Read full description

Disclaimer! Don't use this App for medical decisions. It comes with absolutely no warranty. Use it at your own risk! You can use nightguard to submit your bg values to the Apple HealthKit. This is disabled by default but can be enabled in the nightguard app. Nightguard is an app that displays your blood glucose values from the Nightscout backend. It is a native iOS App with support for the Apple Watch. Features are: - Define a range of acceptable blood glucose values. - Whenever your values are out of range you will be alerted. - You can snooze the alerts all the time and for a defined time period. - You can reactivate the alerts all the time. - You can activate alerts if the values are rising or falling too fast. - The app displays yesterdays values as an overlay chart. This way you have a hint about how your values could behave in the future. - Tune your basal rates with the statistics function to overlay different days - Sync your bg values to HealthKit (optional) For the alarms to work the app has to be active. So you can enable a screen lock that keeps the app running all night long. Have a look at www.nightscout.info for more information about how to setup your own Nightscout backend.

About

FLwatch

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.

Highlights
  • 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
Features
Read full description

FLwatch displays blood glucose readings from Abbott FreeStyle Libre 2, Libre 3 and Libre 3+ sensors, as well as Dexcom G6 / G7 / ONE+ sensors, on your iPhone and Apple Watch. Glucose data can be received through the LibreLinkUp cloud, Dexcom Share, or a direct Bluetooth connection to Libre 3 and Libre 3+ sensors. Workout mode is available with every supported CGM provider. Follow your glucose graph during exercise and set a workout-specific low-glucose alert to help you notice when your glucose falls. With Libre 3 and Libre 3+, direct-to-watch Bluetooth support lets you leave your iPhone behind during exercise. Start a workout in FLwatch to receive sensor readings directly on your Apple Watch. Record insulin doses and view insulin-on-board and insulin activity graphs. With Apple Watch support, widgets, Live Activities, and configurable glucose and sensor alerts, your glucose data is easily accessible across your Apple devices. FLwatch is free and open source. FEATURES Glucose Monitoring • Blood glucose graph on iPhone and Apple Watch • Interactive chart on iPhone — tap to inspect individual readings • Optional calibration offset for directly connected Libre 3 and Libre 3+ sensors • Check your current glucose and trend using Shortcuts or Siri • Optional always-on display mode for quick viewing CGM Providers • Direct Bluetooth connection to Libre 3 and Libre 3+ sensors • LibreLinkUp cloud • Dexcom Share Alerts • Configurable low and high-glucose alerts on iPhone, Apple Watch, and CarPlay • Additional critical-low and signal-loss alerts for directly connected Libre 3 and Libre 3+ sensors • Libre 3 and Libre 3+ warm-up status, remaining sensor life, and expiry and replacement notifications • Optional critical delivery and individual Do Not Disturb times Insulin Tracking • Record insulin doses on iPhone, or with Shortcuts and Siri on iPhone and Apple Watch • Basic carbohydrate and insulin calculator using portion size and a configurable insulin-to-carbohydrate ratio • Insulin on Board (IOB) calculation • Supports rapid-acting and fast-rapid-acting bolus insulins • Insulin on board graph • Insulin activity graph Widgets, Live Activities and CarPlay • iOS Home Screen widgets, with and without graphs • Lock Screen widgets • StandBy widgets for bedside view • Live Activities for quick glucose updates • CarPlay view showing current glucose and IOB • Glucose graphs in CarPlay through widgets and Live Activities Apple Watch • Native watchOS app • Workout mode with glucose monitoring and configurable low-glucose alerts for all supported CGM providers • Direct-to-watch Bluetooth readings from Libre 3 and Libre 3+ during workouts • A wide range of widgets and watch face complications • Glucose graph directly on the watch • On watchOS 11 or later, Live Activities can be mirrored to the Smart Stack For the best direct-to-watch connection, wear your watch on the arm closest to the sensor. Connection drops can still occur and interrupt readings. Data Sharing • Export glucose readings and recorded insulin doses to Apple Health • When using a direct Libre 3 or Libre 3+ Bluetooth connection, export glucose readings and recorded insulin doses to your own Nightscout server MORE INFORMATION For documentation, feature details, and the open-source code, visit: https://flwatch.app/ DISCLAIMER Not for treatment decisions. The information provided by this app and its extensions must not be used for treatment or insulin dosing decisions. Always rely on your glucose monitoring system and consult a healthcare professional when making medical decisions. TRADEMARK NOTICE All product names, trademarks, and registered trademarks are the property of their respective owners. Their use here is for identification purposes only and does not imply affiliation with or endorsement by the trademark holders. This app is not affiliated with or endorsed by Abbott Diabetes Care Inc. or Dexcom Inc.

Screenshots

nightguard4 screens
FLwatch4 screens

Verdict

The call

The clearest difference is update cadence: FLwatch at every 5 days against nightguard's monthly. FLwatch also leads on monetization model (free vs free with in-app purchases) and rating (4.7 vs 4.5). nightguard's advantage is ratings volume (882 vs 38). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. nightguard sells 2 in-app purchases, starting at $1.99 per month and FLwatch sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

FLwatch holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: nightguard has 882 ratings behind it against 38, so its average is the more settled of the two. Written reviews point the same way: 70% of nightguard's written reviews are positive against 84% of FLwatch's.

UpkeepUpdate frequency

nightguard ships an update monthly, FLwatch every 5 days. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

Scorecard5 real differences · 5 level
nightguard versus FLwatch: the parameters behind the verdict, then further details
ParameternightguardFLwatch
PriceFreeFree
Rating4.5 (882 ratings)4.7 (38 ratings) — better
Positive reviews70.1% of reviews84.1% of reviews — better
Number of ratings882 — better38
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple Watch — betteriPhone, Apple Watch
Requires iOS17.0 — better18.0
Further details — not scored
Size13 MB20 MB
Age rating17+17+
DeveloperSPORTMEOPhilipp Poeml

Customer experience

nightguard

All ratings882 ratings
Positive86.1%
Neutral4.1%
Negative9.9%
Written reviews221 reviews
Positive70.1%
Neutral13.1%
Negative16.7%

FLwatch

All ratings38 ratings
Positive89.5%
Neutral7.9%
Negative2.6%
Written reviews44 reviews
Positive84.1%
Neutral11.4%
Negative4.5%

Bugs and requests

nightguard

Reported bugs

4 issues
  • Readings stuck or not updating
  • Nightscout URL not recognized
  • Glucose data not syncing to Apple Health
  • Sudden disappearance of Apple Watch app

Requested features

4 requests
  • Add ability to view/scan graph data points
  • Improve Apple Watch complication and widget
  • Allow custom high/low alert thresholds
  • Provide more detailed user manual/documentation

FLwatch

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

nightguard

Subscriptions2
  • Nightguard Pro$1.991 Month
  • Nightguard Max Subscription$3.991 Month
4 purchases

FLwatch

One-time4
  • Some good coffee beans$4.99
  • Some more good coffee beans$9.99
  • Many good quality coffee beans$24.99
Show 1 more
  • Lots good quality coffee beans$49.99

Questions

Is nightguard free?
nightguard is free to download, with in-app purchases available.
Is FLwatch free?
FLwatch is free to download, with in-app purchases available.
Which has better reviews, nightguard or FLwatch?
FLwatch is rated higher. nightguard averages 4.5 out of 5 from 882 ratings, while FLwatch averages 4.7 from 38 ratings.
Do nightguard or FLwatch have ads?
Neither nightguard nor FLwatch shows ads.
Which is updated more often, nightguard or FLwatch?
nightguard ships an update monthly, and FLwatch every 5 days. Most recently, nightguard was updated on October 16, 2026 and FLwatch on October 15, 2026.

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