Keystone Correction vs 書類フォルダ
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Keystone Correction
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.
- Automatic keystone correction
- Secure offline processing
- Easy document digitization
- Free to use all functions
- No user registration
- Simple interface
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* [Easy] scan and auto-correction * [Secure] don't upload images to the Internet. * [Free] free for all functions. Comcam is a simple, secure, and powerful scanner App ## how to use Step 1: Take a photo or load an existing photo Step2. cut out the part you want Step3. save to a photo app or share to another app ## features - Since the captured images are not uploaded to the Internet, you can be used for business without worrying about security. - Paper documents can be easily digitized, making it possible to go paperless with little effort. - There are no complicated functions, so anyone can use it easily. - Use all features for free. - No user registration required. - No need to upload images to the Internet.
書類フォルダ
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書類フォルダは、写真に撮った書類などを見やすく整理することができるアプリです。 学校からのプリントや、仕事の書類、レシピなど。もちろん書類以外にも普通の写真もフォルダ分けして整理できます。 【おすすめポイント】 ・書類はスキャン機能により文字が見やすく保存されます。 ・保存した書類には手書き、文字入力、スタンプを使用してメモをすることができます。 ・タグを設定することができるので、「期限つき」や「重要」などのタグを見やすく表示できます。タグの種類は自由に追加できます。 ・「撮影日順」「インポート日順」「名前順」でソートすることができます。 ・写真に名前をつけることができます。写真にすると同じような見た目で探しずらい事象もこれで解消です！
Screenshots
Verdict
Keystone Correction and 書類フォルダ both sit at 5.0 stars, but that hides the real split: 67% of Keystone Correction's written reviews are positive against 25% of 書類フォルダ's. Keystone Correction also leads on in-app purchases (none vs 1) and ratings volume (5 vs 1). 書類フォルダ's advantage is ads (none vs shown) and update cadence (every 2 days vs every 2 months). On price, rating 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. 書類フォルダ 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 書類フォルダ. 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 25% of 書類フォルダ's.
Keystone Correction ships an update every 2 months, 書類フォルダ every 2 days. The most recent releases landed on October 20, 2026 and October 14, 2026 respectively.
| Parameter | Keystone Correction | 書類フォルダ |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) | 5.0 (1 ratings) |
| Positive reviews | 66.7% of reviews — better | 25.0% of reviews |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 2 months | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 19 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Masayoshi Shibata | Takatoshi Fukino |
Customer experience
Keystone Correction
書類フォルダ
In-app purchases
Keystone Correction
No in-app purchases
書類フォルダ
- 書類フォルダフルバージョン$1.99
