# t vs BolusCalc

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.

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.

## The numbers

| Metric | t | BolusCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (116 ratings)](https://appshunter.io/ios/app/tsimulator-app/id955568377/reviews) | **[3.8 (23 ratings)](https://appshunter.io/ios/app/boluscalc/id1521364754/reviews)** |
| Number of ratings | **116** | 23 |
| Positive reviews | **42.4% of reviews** | 42.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 31 MB | 65 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Tandem Diabetes Care Inc.](https://appshunter.io/developer/955568376) | [BC Children's Hospital](https://appshunter.io/developer/1521364756) |

## What reviewers say

### t

[App page](https://appshunter.io/ios/app/tsimulator-app/id955568377)

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.

**Highlights:** Explore touchscreen interface, Demonstrates pump features, No prescription required, Educational tool, Mobile device compatible

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Great for education and training
- 👍 Realistic pump interface replica
- 👍 Useful for pre-pump decision making
- 👍 Easy to use and understand
- 👍 Helpful for understanding the pump

**What reviewers complain about**

- 🐛 Simulator not interactive
- 🐛 Doesn't simulate real-world issues (occlusions)
- 🐛 Lacks confirmation screens and alarms
- 🐛 Not a true simulation of pump usage
- 🐛 Only shows basic functions

**Reported bugs**

- 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

**Requested features**

- 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


### BolusCalc

[App page](https://appshunter.io/ios/app/boluscalc/id1521364754)

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.

**Highlights:** Simple insulin bolus calculation, Insulin sliding scale generation, Correction for CGMS arrows, Supports MDI users, Canadian and U.S. units

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is t free?

t is free to download, with no in-app purchases.

### Is BolusCalc free?

BolusCalc is free to download, with no in-app purchases.

### Which has better reviews, t or BolusCalc?

BolusCalc is rated higher. t averages 3.6 out of 5 from 116 ratings, while BolusCalc averages 3.8 from 23 ratings.

### Do t or BolusCalc have ads?

Neither t nor BolusCalc shows ads.

### Which is updated more often, t or BolusCalc?

t ships an update every 2 months, and BolusCalc every 2 days. Most recently, t was updated on September 21, 2026 and BolusCalc on September 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*