Trial&Error vs モバイルKPT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trial&Error
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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.)
モバイルKPT
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Simplify your daily KPT. This mobile app helps you record your daily reflections by organizing them into three categories: Keep, Problem, and Try. With a focus on a simple design and minimal features, it's perfect for those who want to make reflection a habit.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Trial&Error | モバイルKPT |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Weekly |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 17 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Naruhito Ozawa | Riana Uchima |
In-app purchases
Trial&Error
- Monthly fee$0.491 Month
- PremiumPlan(onetime-purchase)$2.99
モバイルKPT
No in-app purchases









