vFlat Scan vs Chouseisan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
vFlat Scan
This app digitizes books and documents with advanced features like automatic border recognition, curved page flattening, and two-page capture. It offers free text recognition (OCR) and exports to multiple formats, making scanning quick and high-quality.
- Auto-recognizing scan area
- Automatic capturing
- Flattening curved book pages
- Two-page capturing
- Free text recognition (OCR)
- Export to PDF, JPG, TXT
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Scan thick books perfectly flat—without cutting a single page. Most scanner apps can't handle open or curved books. vFlat can. AI curve correction transforms any thick textbook, sheet music, or open book into a crystal-clear, professional-grade scan—spine fully intact. · BOOK SCANNER AI automatically flattens curved pages from thick textbooks, manuals, and sheet music. No cutting required. · DOCUMENT SCANNER Scan receipts, ID cards, contracts, invoices, and forms with auto edge-detection and perspective correction. · OCR – IMAGE TO TEXT Convert scanned images into editable, searchable text instantly. Copy and paste from any document. · PDF CREATOR Combine multiple scans into a single PDF. Export as PDF, JPG, or TXT. · AUTO-CAPTURE Hold still or turn the page—vFlat auto-detects and captures. Scan 100+ pages in minutes. · FINGER REMOVAL Hold the book open—vFlat removes your fingers from every scan automatically. · 2-PAGE SPREAD Capture both open pages at once. vFlat splits and saves each page separately. · EASY SHARING Export to iCloud, Google Drive, Dropbox, email, or any app. Trusted by students, musicians, researchers, and professionals in 100+ countries. Download free and transform your iPhone into a professional scanner today. Terms of Use: https://vflat.page.link/terms_en
Chouseisan
This free scheduling app simplifies event organization for both personal and professional use. Easily create event pages and share URLs with guests to coordinate schedules efficiently. It's a top scheduling service in Japan, designed for smooth itinerary planning.
- Streamlines event scheduling
- Easy event page creation
- Shareable event URLs
- Suitable for private and business use
- Large user base in Japan
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Chouseisan is a free and easy to use scheduling application that streamlines scheduling. By streamlining scheduling, you can organize all kinds of events smoothly. ■ One of the largest scheduling services in Japan This is the official application of Chouseisan, one of the largest scheduling applications in Japan with over 8 million monthly active users. ■ Streamlines scheduling for all types of events The simple user experience makes it easy for anyone to use, and it can be used for a wide range of itinerary coordination from private to business situations. ■ Just share the URL with your guests to schedule an event. You can create an event page easily by simply entering the name of the event and possible dates. In addition, the URL of the event page can be shared with guests via chat, etc., for easy scheduling. ■ Completely free of charge Chouseisan is completely free of charge.
Screenshots
Verdict
The clearest difference is in-app purchases: Chouseisan at none against vFlat Scan's 10. Chouseisan also leads on iOS requirement (15.6 vs 17.2). vFlat Scan's advantage is ratings volume (6.3K vs 43). On price, rating, review sentiment and update cadence 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. vFlat Scan sells 10 in-app purchases, starting at $3.99 per month. Chouseisan asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for vFlat Scan against 4.9 for Chouseisan. That said, the two scores are not equally well evidenced: vFlat Scan has 6.3K ratings behind it against 43, so its average is the more settled of the two. Written reviews are what separate them: 79% of vFlat Scan's written reviews are positive against 75% of Chouseisan's.
vFlat Scan ships an update every 2 weeks, Chouseisan fortnightly. The most recent releases landed on November 8, 2026 and November 7, 2026 respectively.
| Parameter | vFlat Scan | Chouseisan |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (6.3K ratings) | 4.9 (43 ratings) — better |
| Positive reviews | 78.9% of reviews — better | 75.0% of reviews |
| Number of ratings | 6.3K — better | 43 |
| Update frequency | Every 2 weeks — better | Fortnightly |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.2 | 15.6 — better |
| Further details — not scored | ||
| Size | 215 MB | 99 MB |
| Age rating | 4+ | 4+ |
| Developer | VoyagerX, Inc. | Mixtend Inc. |
Customer experience
vFlat Scan
Chouseisan
Bugs and requests
vFlat Scan
Reported bugs
4 issues- Crashes during scanning
- Issues with dual page mode
- Incorrect page cropping and resolution in PDFs
- White borders added to scanned pages
Requested features
6 requests- Add cloud storage integration
- Allow manual cropping and contrast adjustment
- Provide more customization options for text view
- Enable editing of OCR text
- Increase free page limits for OCR
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- Add keyboard shortcuts support
Chouseisan
Not enough reviews yet to summarise bugs or requests.
In-app purchases
vFlat Scan
- Monthly subscription$3.991 Month
- Monthly subscription$4.691 Month
- Monthly subscription$4.991 Month
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- Weekly subscription$4.997 Days
- Yearly subscription$35.901 Year
- Yearly subscription7 Days trial$39.991 Year
- EduPlus Yearly Subscription$39.991 Year
- Yearly subscription$39.991 Year
- 3,000 Text recognition pages$10.00
- 10,000 Text recognition pages$20.00
Chouseisan
No in-app purchases









