# Trial&Error vs モバイルKPT

The clearest difference is in-app purchases: モバイルKPT at none against Trial&Error's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Trial&Error sells 2 in-app purchases, starting at $0.49 per month. モバイルKPT asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on November 12, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Trial&Error | モバイルKPT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Weekly | Weekly |
| Size | 17 MB | 18 MB |
| Requires iOS | 15.4 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Naruhito Ozawa](https://appshunter.io/developer/1166703594) | [Riana Uchima](https://appshunter.io/developer/1202581511) |

## What reviewers say

### Trial&Error

[App page](https://appshunter.io/ios/app/trial-and-error/id1612021152)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly fee | $0.49 | per month |
| PremiumPlan(onetime-purchase) | $2.99 | one-time |


### モバイルKPT

[App page](https://appshunter.io/ios/app/kpt/id6745092774)

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

**In-app purchases:** none


## Frequently asked questions

### Is Trial&Error free?

Trial&Error is free to download, with in-app purchases available.

### Is モバイルKPT free?

モバイルKPT is free to download, with no in-app purchases.

### Do Trial&Error or モバイルKPT have ads?

Both Trial&Error and モバイルKPT show ads.

### Which is updated more often, Trial&Error or モバイルKPT?

Trial&Error ships an update weekly, and モバイルKPT weekly. Most recently, Trial&Error was updated on November 12, 2026 and モバイルKPT on November 8, 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.*