# Trelson vs ETT Prep

The clearest difference is in-app purchases: Trelson at none against ETT Prep's 9. ETT Prep's advantage is update cadence (weekly vs every 6 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. ETT Prep sells 9 one-off in-app purchases. Trelson asks for nothing beyond the download.

Trelson ships an update every 6 months, ETT Prep weekly. The most recent releases landed on October 7, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Trelson | ETT Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/ett-prep/id6757318362/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 6 MB | 46 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trelson AB](https://appshunter.io/developer/1770975622) | [A One Institute](https://appshunter.io/developer/1524365853) |

## What reviewers say

### Trelson

[App page](https://appshunter.io/ios/app/trelson/id1437379265)

**Features:** Vision Pro support

**In-app purchases:** none


### ETT Prep

[App page](https://appshunter.io/ios/app/ett-prep/id6757318362)

Prepare for the Digital SAT with full-length practice tests, thousands of targeted questions, and video lectures. Track your progress with smart analytics and personalized recommendations to improve your score.

**Highlights:** Full-length Digital SAT practice tests, Thousands of practice questions with explanations, Video lessons organized by topic, AI-powered explanations, Progress tracking & analytics, Dark mode support

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Premier from Core | $58.00 | one-time |
| Upgrade to Core from Prep Rookie | $86.00 | one-time |
| Core Renewal - 12 Months | $91.00 | one-time |
| Upgrade to Premier from Score Soare | $95.00 | one-time |
| Prep Rookie | $96.00 | one-time |
| Premier Renewal - 12 Months | $119.99 | one-time |
| Upgrade to Premier from Prep Rookie | $143.99 | one-time |
| Core - 12 Month Access | $181.99 | one-time |
| Premier - 12 Month Access | $239.99 | one-time |


## Frequently asked questions

### Is Trelson free?

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

### Is ETT Prep free?

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

### Do Trelson or ETT Prep have ads?

Neither Trelson nor ETT Prep shows ads.

### Which is updated more often, Trelson or ETT Prep?

Trelson ships an update every 6 months, and ETT Prep weekly. Most recently, Trelson was updated on October 7, 2026 and ETT Prep on September 29, 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.*