# Keystone Correction vs Otayori Pocket

The clearest difference is in-app purchases: Keystone Correction at none against Otayori Pocket's 1. Keystone Correction also leads on ratings volume (5 vs 1) and iOS requirement (11.0 vs 13.0). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Otayori Pocket sells 1 one-off in-app purchase. Keystone Correction asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Keystone Correction against 5.0 for Otayori Pocket. That said, the two scores are not equally well evidenced: Keystone Correction has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 67% of Keystone Correction's written reviews are positive against 70% of Otayori Pocket's.

Keystone Correction ships an update every 2 months, Otayori Pocket every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Keystone Correction | Otayori Pocket |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/keystone-correction-comcam/id1504346555/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/otayori-pocket/id1551256228/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 66.7% of reviews | **69.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 19 MB | 55 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masayoshi Shibata](https://appshunter.io/developer/1474388626) | [sky-nexus Inc.](https://appshunter.io/developer/512522554) |

## What reviewers say

### Keystone Correction

[App page](https://appshunter.io/ios/app/keystone-correction-comcam/id1504346555)

Easily scan and auto-correct documents directly on your device. This secure app keeps your images private by not uploading them online, making it ideal for sensitive business use. All functions are available for free, with no registration or complicated steps required.

**Highlights:** Automatic keystone correction, Secure offline processing, Easy document digitization, Free to use all functions, No user registration, Simple interface

**In-app purchases:** none


### Otayori Pocket

[App page](https://appshunter.io/ios/app/otayori-pocket/id1551256228)

Organize school handouts and important documents in one place. Scan physical papers or save digital files from communication apps. Easily manage information for multiple children and access it offline.

**Highlights:** Scan and photograph physical handouts, Save digital handouts from communication apps, Organize handouts for multiple children, Offline access to registered handouts, Tagging for easy searching, Share handouts with others, Automatic deletion of overdue data

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads / Add member colors | $2.99 | one-time |


## Frequently asked questions

### Is Keystone Correction free?

Keystone Correction is free to download, with no in-app purchases.

### Is Otayori Pocket free?

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

### Which has better reviews, Keystone Correction or Otayori Pocket?

Keystone Correction and Otayori Pocket are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do Keystone Correction or Otayori Pocket have ads?

Both Keystone Correction and Otayori Pocket show ads.

### Which is updated more often, Keystone Correction or Otayori Pocket?

Keystone Correction ships an update every 2 months, and Otayori Pocket every 3 months. Most recently, Keystone Correction was updated on November 3, 2026 and Otayori Pocket on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*