# Trial&Error — Trial and error to achieve

> Trial and error to achieve (iPhone/iPad app by Naruhito Ozawa.)

- Source: https://appshunter.io/ios/app/trialerror/id1612021152 (this page in markdown: same URL + `.md`)
- Developer: [Naruhito Ozawa](https://appshunter.io/developer/1166703594)
- Category: Productivity, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.4 · 17 MB
- Languages: English, Japanese
- Released: 2022-03-27
- Data updated: 2026-01-10
- User reviews in markdown: https://appshunter.io/ios/app/trialerror/id1612021152/reviews.md

## What is Trial&Error?

Trail and error is an app that looks back on what you have done and how you can modify your actions to better achieve your goals.

You can use this app like how you would use a sticky note on a board.

Organize your thoughts and categorize them into what you have already tried , what you were able to accomplish, what you can try next. 
Similar to the KPT (keep, problem, try) method, this is a retrospective method.

The content entered is saved on your device. not sent to a server. Making your data secure. Alternatively you can upload your note to iCloud for backup.

In the future, if the number of users increases, we may add a function to share / post the described data, but when adding the function, sharing / posting will be executed by the user's operation. Details will be described in the version upgrade information.

The functions of this application are as follows.



[Function]
・List multiple things you want to achieve
・ A list of trial and error actions is displayed, such as
"What to try", "What you could do", "What you understood", "What to do next".
・ Backup to iCloud and data loading  from iCloud.

[Terms of use]
https://oz-app.blogspot.com/p/blog-page_5.html
(You can switch languages ​​from Translate at the top of the page.)

[Privacy policy]
https://oz-app.blogspot.com/p/blog-page_38.html
(You can switch languages ​​from Translate at the top of the page.)

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly fee | $0.49 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| PremiumPlan(onetime-purchase) | $2.99 | one-time |



## Version history (last 5 releases)

### 1.5 — 2023-05-21

- layout adjustment
- New information page added

### 1.4 — 2023-05-11

minor change

### 1.3 — 2023-05-06

- fix bugs
- add premium plan

### 1.2 — 2022-03-27

add new information display, update localization.

### 1.1 — 2022-03-20

・Added the ability to show if it's the latest version of the app.
・Localization support
・Modify screen of about this app

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-01-10.*