Comparison

nightguard vs LinX CGM

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

LinX CGM

This app receives and displays glucose concentration values from a continuous glucose monitoring system. It alerts users when blood glucose levels exceed preset limits and helps analyze readings to form reports. Measurements are not for diabetes diagnosis.

Highlights
  • Receive and display glucose concentration
  • Alerts for high/low blood glucose
  • Analyze glucose readings
  • Generate reports
  • System settings
Features
Read full description

Lin X is an application available on your phone used to receive and display the glucose concentration value and remind when the blood glucose value exceeds the upper or lower limit of the preset blood glucose value. It also has system Settings and other functions to help users analyze and evaluate the glucose reading of the continuous glucose monitoring system and form a report. Measurements displayed on Lin X cannot be used for the diagnosis or screening of diabetes. The app is intended for informational use only and is not a substitute for professional medical advice. Always seek the advice of your doctor or other qualified health provider with any questions you may have regarding a medical condition. Note: The compatible medical hardware is certified and available for use in the following countries/regions: European Union (EU). Disclaimer: Lin X is designed to support, not replace, professional medical care. Always consult your doctor or a qualified healthcare provider before making any medical decisions based on the information provided by this app. The app and its developers are not responsible for any health-related outcomes resulting from the use of or reliance on the data displayed.

Screenshots

nightguard4 screens
LinX CGM3 screens

Verdict

The call

The clearest difference is rating: nightguard at 4.5 against LinX CGM's 3.3. nightguard also leads on review sentiment (70% vs 37%) and ratings volume (889 vs 13). LinX CGM's advantage is in-app purchases (none vs 2) and iOS requirement (14.0 vs 17.0). On price, update cadence, ads 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. LinX CGM asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

nightguard holds the better App Store score, 4.5 against 3.3. That said, the two scores are not equally well evidenced: nightguard has 889 ratings behind it against 13, 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 37% of LinX CGM's.

UpkeepUpdate frequency

nightguard ships an update monthly, LinX CGM every 4 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard6 real differences · 4 level
nightguard versus LinX CGM: the parameters behind the verdict, then further details
ParameternightguardLinX CGM
PriceFreeFree
Rating4.5 (889 ratings) — better3.3 (13 ratings)
Positive reviews70.1% of reviews — better36.8% of reviews
Number of ratings889 — better13
Update frequencyMonthlyEvery 4 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple WatchiPhone, iPod, Apple Watch
Requires iOS17.014.0 — better
Further details — not scored
Size13 MB112 MB
Age rating17+4+
DeveloperSPORTMEOMicro Tech Medical (Hangzhou) Co., LTD.

Customer experience

nightguard

All ratings887 ratings
Positive86.1%
Neutral4.1%
Negative9.8%
Written reviews221 reviews
Positive70.1%
Neutral13.1%
Negative16.7%

LinX CGM

All ratings7 ratings
Positive71.4%
Neutral0.0%
Negative28.6%
Written reviews19 reviews
Positive36.8%
Neutral21.1%
Negative42.1%

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

LinX CGM

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
None

LinX CGM

No in-app purchases

Questions

Is nightguard free?
nightguard is free to download, with in-app purchases available.
Is LinX CGM free?
LinX CGM is free to download, with no in-app purchases.
Which has better reviews, nightguard or LinX CGM?
nightguard is rated higher. nightguard averages 4.5 out of 5 from 889 ratings, while LinX CGM averages 3.3 from 13 ratings.
Do nightguard or LinX CGM have ads?
Neither nightguard nor LinX CGM shows ads.
Which is updated more often, nightguard or LinX CGM?
nightguard ships an update monthly, and LinX CGM every 4 weeks. Most recently, nightguard was updated on October 26, 2026 and LinX CGM on October 27, 2026.

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