# CGMSIM vs T1 Masters

The clearest difference is in-app purchases: CGMSIM at none against T1 Masters's 1. CGMSIM also leads on update cadence (every 2 months vs every 8 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. T1 Masters sells 1 one-off in-app purchase. CGMSIM asks for nothing beyond the download.

CGMSIM ships an update every 2 months, T1 Masters every 8 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | CGMSIM | T1 Masters |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/cgmsim/id1667105182/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Free | — |
| Size | 43 MB | 84 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Lorenzo Sandini](https://appshunter.io/developer/1667105184) | [TagMango Inc](https://appshunter.io/developer/1611765353) |

## What reviewers say

### CGMSIM

[App page](https://appshunter.io/ios/app/cgmsim/id1667105182)

Simulate managing Type 1 Diabetes by administering meals and insulin. Maintain target blood glucose levels while minimizing lows and highs. Integrate activity data for a realistic experience.

**Highlights:** Virtual Type 1 Diabetes subject management, Meal and insulin administration (MDI/CSII), Glycemic target range maintenance, Hypo/hyperglycemia alerts, Activity tracker integration (Fitbit, Google Fit), Nightscout CGM trace display, Success report generation

**Features:** macOS Compatibility

**In-app purchases:** none


### T1 Masters

[App page](https://appshunter.io/ios/app/t1-masters/id6748383882)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mastering your a1c | $69.99 | one-time |


## Frequently asked questions

### Is CGMSIM free?

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

### Is T1 Masters free?

T1 Masters is free to download, with in-app purchases available.

### Do CGMSIM or T1 Masters have ads?

Neither CGMSIM nor T1 Masters shows ads.

### Which is updated more often, CGMSIM or T1 Masters?

CGMSIM ships an update every 2 months, and T1 Masters every 8 months. Most recently, CGMSIM was updated on October 24, 2026 and T1 Masters on October 16, 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.*