# reminDO vs 逆算勉強

The clearest difference is in-app purchases: 逆算勉強 at none against reminDO's 11. 逆算勉強 also leads on ads (none vs shown) and update cadence (daily vs weekly). On price and device support there is nothing between them.

Both are free to download. reminDO sells 11 in-app purchases, starting at $1.99 per month. 逆算勉強 asks for nothing beyond the download.

reminDO ships an update weekly, 逆算勉強 daily. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | reminDO | 逆算勉強 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (61 ratings)](https://appshunter.io/ios/app/remindo-ensure-knowledge/id1058865810/reviews)** | — |
| Number of ratings | **61** | — |
| Positive reviews | 71.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 78 MB | 51 MB |
| Requires iOS | 15 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [atkk](https://appshunter.io/developer/543439608) | [Kodai Maki](https://appshunter.io/developer/1674346013) |

## What reviewers say

### reminDO

[App page](https://appshunter.io/ios/app/remindo-ensure-knowledge/id1058865810)

This app helps you retain information by sending timely reminders before you forget it. It optimizes your study sessions based on the forgetting curve, ensuring maximum memorization with minimal effort. Easily manage your learning materials and study across multiple devices.

**Highlights:** Optimized studying based on forgetting curve, Manage 'to do' lists for learning, Study on smartphone, tablet, or PC, Memorize book/article gists, Capture and recall notes, Remember quotes and foreign language words

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

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Member (Monthly) | $1.99 | per month |
| Monthly + 7 Days Free | $1.99 | per month |
| Plus Member (Monthly) | $2.99 | per month |
| Plus Member (Monthly) | $4.49 | per month |
| 3 Months + 3 Days Free | $5.99 | per 3 months |
| 3 Months + 7 Days Free | $5.99 | per 3 months |
| Annual + 7 Days Free | $14.99 | per year |
| Plus Member (Yearly) | $19.99 | per year |
| Annual + 3 Days Free | $19.99 | per year |
| Annual + 7 Days Free | $19.99 | per year |
| Lifetime License | $34.99 | one-time |


### 逆算勉強

[App page](https://appshunter.io/ios/app/id6445865041)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is reminDO free?

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

### Is 逆算勉強 free?

逆算勉強 is free to download, with no in-app purchases.

### Do reminDO or 逆算勉強 have ads?

reminDO shows ads; 逆算勉強 does not.

### Which is updated more often, reminDO or 逆算勉強?

reminDO ships an update weekly, and 逆算勉強 daily. Most recently, reminDO was updated on September 21, 2026 and 逆算勉強 on June 1, 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.*