# Keystone Correction vs タテ帳

The clearest difference is update cadence: Keystone Correction at every 2 months against タテ帳's every 4 months. Keystone Correction also leads on iOS requirement (11.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Keystone Correction ships an update every 2 months, タテ帳 every 4 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Keystone Correction | タテ帳 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/keystone-correction-comcam/id1504346555/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Ad-supported | — |
| Size | 19 MB | 26 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masayoshi Shibata](https://appshunter.io/developer/1474388626) | [Takehiro Ichimnura](https://appshunter.io/developer/1697514237) |

## 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


### タテ帳

[App page](https://appshunter.io/ios/app/id6451317442)

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

**In-app purchases:** none


## Frequently asked questions

### Is Keystone Correction free?

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

### Is タテ帳 free?

タテ帳 is free to download, with no in-app purchases.

### Do Keystone Correction or タテ帳 have ads?

Both Keystone Correction and タテ帳 show ads.

### Which is updated more often, Keystone Correction or タテ帳?

Keystone Correction ships an update every 2 months, and タテ帳 every 4 months. Most recently, Keystone Correction was updated on November 3, 2026 and タテ帳 on October 27, 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.*