Comparison

Tandem Mobi® mobile app vs Bionic Circle

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

Head to head
About

Tandem Mobi® mobile app

This app controls a small, durable automated insulin delivery system. It offers convenience and discretion, allowing users to manage their diabetes directly from a compatible iPhone. Prescription required for use.

Highlights
  • Automated insulin delivery control
  • Small and durable system
  • iPhone controllable
  • Discreet operation
  • Requires prescription
Read full description

Tandem Mobi is the world’s smallest, durable automated insulin delivery system.1 Impressively small and offering next-level convenience and discretion, Tandem Mobi is controllable with a compatible, personal iPhone.* Use of the Tandem Mobi mobile app requires a prescription. Always consult a healthcare professional for information about how to manage diabetes. Features * Mobile Control: The Tandem Mobi system is controllable from a compatible, personal iPhone, offering discreet and convenient access to therapy data and pump functions* * Advanced Therapy Visualization: View a 24-hour graphical representation of glucose readings (CGM and BGM), basal and bolus events, insulin on board, carbohydrate intake, suspensions, and other therapy-related data * Pump Status Monitoring: Real-time visibility into pump battery level, available insulin, active Personal Profile, CGM sensor and transmitter status, and more * Customizable User Experience: Personal Profiles and activity settings allow users to tailor therapy to their lifestyle, with enhanced personalization features * AutoBolus: The only system with AutoBolus to help with missed meal boluses and preventing hyperglycemia† * Seamless Data Sync: Wireless data uploads to the Tandem Source platform to ensure therapy data is securely backed up and accessible‡ ALWAYS READ THE LABEL AND FOLLOW THE DIRECTIONS FOR USE. The electronic instructions for use for the Tandem Mobi mobile app (Basic UDI-DI: 00389152690940) can be accessed through the Tandem Mobi user guide, available here: https://www.tandemdiabetes.com/support/resources/documents. Upon request, a printed copy of the user guide can be provided within seven days at no additional cost. If the language set on your smartphone is supported by the mobile app, then the mobile app will display in that language. If the language set on your smartphone is not supported by the mobile app, then the mobile app will display in English. *The mobile app requires a compatible smartphone model and operating system (sold separately). †If glucose values are predicted to be above 180 mg/dL (or 10.0 mmol/L), Control-IQ+ technology calculates an AutoBolus using the Personal Profile settings and a target of 110 mg/dL (or 6.1 mmol/L) and delivers 60% of that value. ‡Uploads to the Tandem Source platform do not take place in real time and should not be relied upon by healthcare providers, pump users, or caregivers for remote patient monitoring. Standard carrier data rates may apply. Smartphone sold separately. Reference 1. As of Dec., 2025. Data on file, Tandem Diabetes Care.

About

Bionic Circle

This app allows designated individuals to remotely monitor the diabetes management of an iLet user. It provides real-time access to crucial data like glucose levels, insulin status, and alerts, offering peace of mind for caregivers and family members.

Highlights
  • View CGM values
  • Monitor pump battery and insulin levels
  • See meal announcements
  • Track insulin doses
  • Receive critical alerts (low, high, no data)
  • Remote monitoring from anywhere
Read full description

Bionic Circle – Join the Bionic Circle and see your loved one's diabetes management - from anywhere! iLet users can invite up to 10 people to join their Circle. Loved ones can accept the invitation and download this Bionic Circle App to see: - CGM Values - Pump Battery and Insulin Cartridge Levels - Meal Announcements - Insulin Doses - Alerts - Urgent Low - Urgent Low Soon - Low - High - No Data Joining the Bionic Circle allows loved ones to monitor the iLet users from anywhere. With the secure wireless connection from the iLet App, the Bionic Circle allows you to follow glucose levels, meal announcements, insulin doses and trends throughout the day and night. If your loved one is at school, at a friend’s house, traveling or just at work or home, you’ll have confidence that the iLet is taking care of their diabetes management. If you have any questions about this app, please call our Customer Care team at 1-855-745-3800 option 1. WARNING: Dosing decisions should not be made based on this device. Users should follow instructions on the iLet Bionic Pancreas System.  Please note that any changes made to your iLet therapy settings should be done under the guidance and supervision of a qualified healthcare professional. Before making any adjustments, it is important to consult with your doctor to ensure that the changes are appropriate for your individual needs and health status. For iLet Bionic Pancreas safety information, visit www.betabionics.com/safety

Screenshots

Tandem Mobi® mobile app4 screens
Bionic Circle4 screens

Verdict

The call

The clearest difference is rating: Bionic Circle at 4.8 against Tandem Mobi® mobile app's 3.3. Bionic Circle also leads on review sentiment (77% vs 39%) and iOS requirement (16.0 vs 18.0). Tandem Mobi® mobile app's advantage is ratings volume (220 vs 70). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Bionic Circle holds the better App Store score, 4.8 against 3.3. Both are backed by a comparable volume of ratings — 220 and 70 respectively. Written reviews point the same way: 39% of Tandem Mobi® mobile app's written reviews are positive against 77% of Bionic Circle's.

UpkeepUpdate frequency

Tandem Mobi® mobile app ships an update every 2 months, Bionic Circle every 3 months. The most recent releases landed on September 27, 2026 and August 5, 2026 respectively.

Scorecard4 real differences · 6 level
Tandem Mobi® mobile app versus Bionic Circle: the parameters behind the verdict, then further details
ParameterTandem Mobi® mobile appBionic Circle
PriceFreeFree
Rating3.3 (220 ratings)4.8 (70 ratings) — better
Positive reviews39.1% of reviews76.9% of reviews — better
Number of ratings220 — better70
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone, iPad — better
Requires iOS18.016.0 — better
Further details — not scored
Size153 MB36 MB
Age rating4+4+
DeveloperTandem Diabetes Care Inc.Beta Bionics Inc.

Customer experience

Tandem Mobi® mobile app

All ratings144 ratings
Positive58.3%
Neutral15.3%
Negative26.4%
Written reviews138 reviews
Positive39.1%
Neutral24.6%
Negative36.2%

Bionic Circle

All ratings70 ratings
Positive95.7%
Neutral1.4%
Negative2.9%
Written reviews26 reviews
Positive76.9%
Neutral3.8%
Negative19.2%

User reviews

Tandem Mobi® mobile app

From 220 App Store ratings

What we love

  • 🚀 Great for reducing high and low blood glucose levels
  • 🚀 Helps keep you in range
  • 🚀 Smaller and lighter pump
  • 👍 Easy to use app
  • 👍 Mostly intuitive to use

Room to improve

  • 🐛 Frequent connection issues with CGM
  • 🐛 Graph data disappearing
  • 🐛 Unreliable app performance
  • 🔕 Excessive and repetitive notifications
  • 🔕 Inability to customize notifications

Bionic Circle

From 70 App Store ratings

What we love

  • 💡 First app of its kind
  • 👍 Ease of use
  • 👍 Helpful for families and caregivers
  • 👍 Customizable alerts
  • 👍 Provides peace of mind

Room to improve

  • 🔋 Lack of battery level and insulin unit information

Bugs and requests

Tandem Mobi® mobile app

Reported bugs

4 issues
  • Frequent disconnections between pump and app
  • Graph data disappearing
  • Incompatibility with newer iPhone models
  • Bolus timeout issues

Requested features

7 requests
  • Longer stop delivery alarm delay
  • Ability to set exercise and activity timers
  • More customization options for notifications
  • Apple Watch app integration
  • Home screen and lock screen widgets
Show 2 more
  • Siri integration for checking glucose levels
  • Ability to view total daily dose in app

Bionic Circle

No bugs or feature requests surfaced in reviews.

In-app purchases

None

Tandem Mobi® mobile app

No in-app purchases

None

Bionic Circle

No in-app purchases

Questions

Is Tandem Mobi® mobile app free?
Tandem Mobi® mobile app is free to download, with no in-app purchases.
Is Bionic Circle free?
Bionic Circle is free to download, with no in-app purchases.
Which has better reviews, Tandem Mobi® mobile app or Bionic Circle?
Bionic Circle is rated higher. Tandem Mobi® mobile app averages 3.3 out of 5 from 220 ratings, while Bionic Circle averages 4.8 from 70 ratings.
Do Tandem Mobi® mobile app or Bionic Circle have ads?
Neither Tandem Mobi® mobile app nor Bionic Circle shows ads.
Which is updated more often, Tandem Mobi® mobile app or Bionic Circle?
Tandem Mobi® mobile app ships an update every 2 months, and Bionic Circle every 3 months. Most recently, Tandem Mobi® mobile app was updated on September 27, 2026 and Bionic Circle on August 5, 2026.

Other comparisons