# ISTQB Study Buddy CTFL vs Performance Engineer Trainer

The clearest difference is in-app purchases: Performance Engineer Trainer at none against ISTQB Study Buddy CTFL's 2. ISTQB Study Buddy CTFL's advantage is update cadence (daily vs every 4 days) and iOS requirement (13.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. ISTQB Study Buddy CTFL sells 2 one-off in-app purchases. Performance Engineer Trainer asks for nothing beyond the download.

ISTQB Study Buddy CTFL ships an update daily, Performance Engineer Trainer every 4 days. The most recent releases landed on October 8, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | ISTQB Study Buddy CTFL | Performance Engineer Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 4 days |
| Size | 18 MB | 4 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Roland Ross Lacdan Hadi](https://appshunter.io/developer/1678311523) | [Kirill Kalistratov](https://appshunter.io/developer/1888794382) |

## What reviewers say

### ISTQB Study Buddy CTFL

[App page](https://appshunter.io/ios/app/istqb-study-buddy-ctfl/id6446593084)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ISTQB Study Buddy CTFL | $6.99 | one-time |
| Full Version | $6.99 | 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 ISTQB Study Buddy CTFL free?

ISTQB Study Buddy CTFL 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 ISTQB Study Buddy CTFL or Performance Engineer Trainer have ads?

Neither ISTQB Study Buddy CTFL nor Performance Engineer Trainer shows ads.

### Which is updated more often, ISTQB Study Buddy CTFL or Performance Engineer Trainer?

ISTQB Study Buddy CTFL ships an update daily, and Performance Engineer Trainer every 4 days. Most recently, ISTQB Study Buddy CTFL was updated on October 8, 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.*