Comparison

vFlat Scan vs Chouseisan

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Auto-recognizing scan area
  • Automatic capturing
  • Flattening curved book pages
  • Two-page capturing
  • Free text recognition (OCR)
  • Export to PDF, JPG, TXT
Read full description

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

About

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.

Highlights
  • Streamlines event scheduling
  • Easy event page creation
  • Shareable event URLs
  • Suitable for private and business use
  • Large user base in Japan
Features
Read full description

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

vFlat Scan4 screens
Chouseisan4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

vFlat Scan ships an update every 2 weeks, Chouseisan fortnightly. The most recent releases landed on November 8, 2026 and November 7, 2026 respectively.

Scorecard4 real differences · 6 level
vFlat Scan versus Chouseisan: the parameters behind the verdict, then further details
ParametervFlat ScanChouseisan
PriceFreeFree
Rating4.8 (6.3K ratings)4.9 (43 ratings) — better
Positive reviews78.9% of reviews — better75.0% of reviews
Number of ratings6.3K — better43
Update frequencyEvery 2 weeks — betterFortnightly
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.215.6 — better
Further details — not scored
Size215 MB99 MB
Age rating4+4+
DeveloperVoyagerX, Inc.Mixtend Inc.

Customer experience

vFlat Scan

All ratings6,311 ratings
Positive95.9%
Neutral1.5%
Negative2.6%
Written reviews663 reviews
Positive78.9%
Neutral5.3%
Negative15.8%

Chouseisan

All ratings43 ratings
Positive97.7%
Neutral2.3%
Negative0.0%
Written reviews20 reviews
Positive75.0%
Neutral5.0%
Negative20.0%

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
Show 1 more
  • Add keyboard shortcuts support

Chouseisan

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

vFlat Scan

Subscriptions8
  • Monthly subscription$3.991 Month
  • Monthly subscription$4.691 Month
  • Monthly subscription$4.991 Month
Show 5 more
  • 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
One-time2
  • 3,000 Text recognition pages$10.00
  • 10,000 Text recognition pages$20.00
None

Chouseisan

No in-app purchases

Questions

Is vFlat Scan free?
vFlat Scan is free to download, with in-app purchases available.
Is Chouseisan free?
Chouseisan is free to download, with no in-app purchases.
Which has better reviews, vFlat Scan or Chouseisan?
Chouseisan is rated higher. vFlat Scan averages 4.8 out of 5 from 6.3K ratings, while Chouseisan averages 4.9 from 43 ratings.
Do vFlat Scan or Chouseisan have ads?
Both vFlat Scan and Chouseisan show ads.
Which is updated more often, vFlat Scan or Chouseisan?
vFlat Scan ships an update every 2 weeks, and Chouseisan fortnightly. Most recently, vFlat Scan was updated on November 8, 2026 and Chouseisan on November 7, 2026.

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