# Trial&Error vs Focus4

The clearest difference is ads: Focus4 at none against Trial&Error's shown. Trial&Error's advantage is update cadence (weekly vs every 6 weeks) and iOS requirement (15.4 vs 17.6). On price, in-app purchases 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 and Focus4 sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Trial&Error ships an update weekly, Focus4 every 6 weeks. The most recent releases landed on September 13, 2026 and June 8, 2026 respectively.

## The numbers

| Metric | Trial&Error | Focus4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 6 weeks |
| Size | 17 MB | 9 MB |
| Requires iOS | **15.4** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Naruhito Ozawa](https://appshunter.io/developer/1166703594) | [Kirlos Yousef](https://appshunter.io/developer/1514432748) |

## 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 |


### Focus4

[App page](https://appshunter.io/ios/app/focus4-work-and-study-ai-timer/id6739164359)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Membership (Monthly) | $2.99 | per month |
| Premium Membership | $19.99 | per year |


## Frequently asked questions

### Is Trial&Error free?

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

### Is Focus4 free?

Focus4 is free to download, with in-app purchases available.

### Do Trial&Error or Focus4 have ads?

Trial&Error shows ads; Focus4 does not.

### Which is updated more often, Trial&Error or Focus4?

Trial&Error ships an update weekly, and Focus4 every 6 weeks. Most recently, Trial&Error was updated on September 13, 2026 and Focus4 on June 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.*