# SIGMA Clermont vs Prepstr

The clearest difference is in-app purchases: SIGMA Clermont at none against Prepstr's 3. SIGMA Clermont also leads on iOS requirement (15.0 vs 17.0). Prepstr's advantage is update cadence (every 4 days vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Prepstr sells 3 in-app purchases, starting at $3.99 per 7 days. SIGMA Clermont asks for nothing beyond the download.

SIGMA Clermont ships an update every 10 months, Prepstr every 4 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | SIGMA Clermont | Prepstr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 4 days** |
| Size | 35 MB | 40 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AppScho](https://appshunter.io/developer/967238642) | [Prepstr](https://appshunter.io/developer/1896594682) |

## What reviewers say

### SIGMA Clermont

[App page](https://appshunter.io/ios/app/sigma-clermont/id1504916771)

**Features:** macOS Compatibility

**In-app purchases:** none


### Prepstr

[App page](https://appshunter.io/ios/app/prepstr-toeic-and-toefl/id6768670573)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hebdomadaire | $3.99 | per 7 days |
| Mensuel | $11.99 | per month |
| Annuel | $49.99 | per year |


## Frequently asked questions

### Is SIGMA Clermont free?

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

### Is Prepstr free?

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

### Do SIGMA Clermont or Prepstr have ads?

Neither SIGMA Clermont nor Prepstr shows ads.

### Which is updated more often, SIGMA Clermont or Prepstr?

SIGMA Clermont ships an update every 10 months, and Prepstr every 4 days. Most recently, SIGMA Clermont was updated on October 25, 2026 and Prepstr on October 25, 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.*