t vs BolusCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
t
Explore the features of an insulin pump's touchscreen interface without needing a prescription. This app is ideal for individuals with diabetes, their caregivers, or healthcare professionals to understand pump functionality.
- Explore touchscreen interface
- Demonstrates pump features
- No prescription required
- Educational tool
- Mobile device compatible
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The t:simulator™ App is an easy way to explore the simple touchscreen interface of the t:slim X2™ Insulin Pump from Tandem Diabetes Care, no prescription or insurance verification required! Whether you’re a person living with diabetes, a relative or caregiver, or a healthcare provider, we make it simple to explore the t:slim X2 Pump’s features on your mobile device. THIS APPLICATION IS FOR DEMONSTRATION PURPOSES ONLY. IT SHOULD NOT BE USED FOR THERAPY DECISIONS. Due to the variety of sizes of compatible devices, the t:simulator App may not display the pump at actual size. Actual size is 2” x 3.13”. Please refer to the Technical Specifications in the Resources section of the app for more detailed information.
BolusCalc
This app assists with calculating insulin doses for individuals managing diabetes. It offers features for simple bolus calculations, insulin sliding scales, and adjustments based on continuous glucose monitoring data. Supports both Canadian and U.S. blood glucose units.
- Simple insulin bolus calculation
- Insulin sliding scale generation
- Correction for CGMS arrows
- Supports MDI users
- Canadian and U.S. units
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his app is designed for simple calculations of insulin doses in the Canadian home and school setting (although calculations can also be done in U.S. mg/dL blood glucose units). There are 4 screens available: The “Simple Insulin Bolus” screen calculates an insulin dose for people on multiple daily injections (MDI) based on carb ratio, correction/sensitivity factor (ISF), target BG (the default is 6 mmol/L or 100 mg/dL for daytime, and 8 mmol/L or 120 mg/dL for bedtime), carbs to be consumed, and current BG. The “Simple Insulin Scale” screen generates a simplified insulin sliding scale for people who are on a fixed dose of carbs at a meal, based on baseline insulin dose, ISF, and target BG. The “Full Sliding Scale” screen generates a full insulin scale for people on MDI based on carb ratio, ISF, and target BG. The “Correcting for Arrows” screen allows CGMS users to calculate an increase or decrease in insulin dose (or carbs) to account for positive or negative direction arrows.
Screenshots
Verdict
The clearest difference is update cadence: BolusCalc at every 2 days against t's every 2 months. t's advantage is ratings volume (116 vs 23). On price, rating, review sentiment and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BolusCalc holds the better App Store score, 3.8 against 3.6. That said, the two scores are not equally well evidenced: t has 116 ratings behind it against 23, so its average is the more settled of the two. Written reviews split almost evenly too, at 42% and 42% positive.
t ships an update every 2 months, BolusCalc every 2 days. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.
| Parameter | t | BolusCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (116 ratings) | 3.8 (23 ratings) — better |
| Positive reviews | 42.4% of reviews — better | 42.1% of reviews |
| Number of ratings | 116 — better | 23 |
| Update frequency | Every 2 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 31 MB | 65 MB |
| Age rating | 4+ | 17+ |
| Developer | Tandem Diabetes Care Inc. | BC Children's Hospital |
Customer experience
t
BolusCalc
Bugs and requests
t
Reported bugs
13 issues- App won't open once downloaded
- Simulator crashes on launch
- App broken on iOS 12
- Simulator app broken on iOS 12
- Simulator crashes as soon as app is open
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- Simulator not working
- App crashes when opening on iPhone X
- Simulator crashes on iOS 12
- Simulator doesn't work
- App bombs on launch
- Lagging and not working properly
- Doesn't update as often
- US version installed on iPhone, needs German version
Requested features
14 requests- Actual app to control and manage the pump
- App available in Canada/Europe
- Display beep noises for alerts
- Simulate real-world issues like occlusions
- Ability to simulate changing the pump
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- Bolus from the app
- Option to change mmol/l to mg/dl
- Bluetooth control of the pump
- App to upload reports from the pump for iPad
- Integrate with Apple Watch for alerts
- Actual app that sends information to phone
- Simulate confirmation screens and alarms
- More realistic simulation of pump usage
- Display insulin on board information
BolusCalc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
t
No in-app purchases
BolusCalc
No in-app purchases









