# Tech English for Developers vs Performance Engineer Trainer

The clearest difference is in-app purchases: Performance Engineer Trainer at none against Tech English for Developers's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Tech English for Developers sells 1 one-off in-app purchase. Performance Engineer Trainer asks for nothing beyond the download.

Tech English for Developers ships an update every 5 days, Performance Engineer Trainer every 4 days. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Tech English for Developers | Performance Engineer Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 59 MB | 4 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [katsuya tamai](https://appshunter.io/developer/1504443936) | [Kirill Kalistratov](https://appshunter.io/developer/1888794382) |

## What reviewers say

### Tech English for Developers

[App page](https://appshunter.io/ios/app/tech-english-for-developers/id6742486115)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示（買い切り） | $1.99 | one-time |


### Performance Engineer Trainer

[App page](https://appshunter.io/ios/app/performance-engineer-trainer/id6761308281)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tech English for Developers free?

Tech English for Developers is free to download, with in-app purchases available.

### Is Performance Engineer Trainer free?

Performance Engineer Trainer is free to download, with no in-app purchases.

### Do Tech English for Developers or Performance Engineer Trainer have ads?

Neither Tech English for Developers nor Performance Engineer Trainer shows ads.

### Which is updated more often, Tech English for Developers or Performance Engineer Trainer?

Tech English for Developers ships an update every 5 days, and Performance Engineer Trainer every 4 days. Most recently, Tech English for Developers was updated on September 30, 2026 and Performance Engineer Trainer 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.*