Ruler / Measuring Tape vs iScan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ruler / Measuring Tape
Measure objects using your device's screen, augmented reality, or by printing a ruler. Offers three distinct methods for on-demand measurement without physical tools.
- Measure against screen
- Augmented reality measurement
- Printable ruler via AirPrint
- ARKit integration
- No ads or in-app purchases
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Three ways to measure when you don't have a measuring tape or a ruler: 1 – AGAINST YOUR SCREEN Simple and precise for small measurements. 2 – IN AUGMENTED REALITY Place a virtual measuring tape on a vertical or horizontal surface, such as a wall, table or floor. Built with ARKit. 3 – USING AIRPRINT Print a ruler! Accuracy depends on the printer, so check the result against the on-screen ruler. NO ADS / NO IN-APP PURCHASES / NO TRACKING If you enjoy this app, discover "Print to Size" and my other independent apps at clafou.com
iScan
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iScan-D is a document scanner for anything from receipts and contracts to posters — no fixed page size. Capture, de-skew, OCR, search, and export all happen on your device. There's no sign-in, and your images and recognized text are never sent to a server. ■ Two scan modes • Normal scan: capture receipts, business cards, postcards, and everyday documents one sheet at a time. • Long scan: move the camera slowly downward to stitch a very long receipt into a single tall image. ■ Import from your photo library Already have a photo? Select one or several and bring them in as pages — no need to reshoot. ■ Precise cropping and de-skewing • The document's four corners are detected automatically. Fine-tune them by hand, with a magnifier so your finger never hides the corner. • A perspective transform straightens the page so a photo taken at an angle looks like it was shot head-on. • Corner cropping and a final rectangular crop are separate steps. ■ Finishing touches • Rotate, rectangular crop, brightness, contrast, saturation, sharpness, grayscale. • One-tap "Enhance" removes shadows and uneven lighting, whitens the background, and makes text crisp. • Brightness, contrast, and saturation preview in real time and can each be reset individually. ■ OCR in 9 languages Japanese, English, Italian, Spanish, French, German, Korean, and Chinese (Simplified / Traditional). OCR runs on device using Apple's technology, and the language follows your app language automatically. Recognized text is fully editable, and pages that fail recognition can be typed in by hand. ■ Find it, share it • Full-text search across titles, notes, and OCR text, with a snippet of the matching text. • PDF export embeds an invisible text layer so you can search inside the exported PDF. • Export as PDF, JPEG, or PNG, with paper sizes (A4, A5, B5, Letter, custom) and image sizes (original, large, medium, small, custom). • Combine multiple pages into one PDF in order and share it. ■ Organize and manage • Give each document a title and a note; the title is generated from the capture date. • The original image is always kept, so you can redo corner adjustment, perspective, editing, and OCR even after saving. • Deleted documents go to Trash. They can be restored for 10 days, then are permanently deleted automatically. You can also delete permanently right away. ■ Privacy • Images, OCR results, and document information are never sent off device. • All key processing, including OCR, works on device and offline. • No account or sign-in. • No cloud sync or built-in backup. ■ Requirements Supports the latest iOS and the two previous major versions. Works on iPhone and iPad. Note: This app shows a banner ad (Google AdMob) at the bottom of the document list.
Screenshots
Verdict
The clearest difference is ads: Ruler / Measuring Tape at none against iScan's shown. Ruler / Measuring Tape also leads on iOS requirement (16.0 vs 18.0). iScan's advantage is update cadence (every 9 days vs every 4 months). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Ruler / Measuring Tape ships an update every 4 months, iScan every 9 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Ruler / Measuring Tape | iScan |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (238 ratings) — better | — |
| Positive reviews | 50.7% of reviews | — |
| Number of ratings | 238 — better | — |
| Update frequency | Every 4 months | Every 9 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 6 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Clafou Ltd | kenta isomi |
Bugs and requests
Ruler / Measuring Tape
Reported bugs
26 issues- Cannot accurately measure anything
- Force turns off the flashlight
- Shows totally wrong scale on iPhone 15 Pro Max
- cm and inch are in reverse directions
- Ne s’adapte pas au zoom de l’écran
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- Wouldn’t detect any surface
- Incorrect for iPad 7th Gen
- Doesn’t work as advertised (requires camera access)
- Impossibilité de mesurer des verticales
- Sólo sirve para cosas pequeñas
- Pas fiable, mesures différentes comparées avec un mètre-ruban
- Ne fonctionne pas
- Ne marche pas
- Tardo años, no sirve
- Can’t detect flat surface
- iPhone 6s: marche une fois sur dix
- Keeps analysing repeatedly with no recognition whatsoever
- Funktioniert nicht
- No vale para nada, no funciona y no detecta el suelo ni la mesa
- Todavía no entiendo para que sirve
- The augmented reality doesnt work accurately and the rules wont allow us to touch the screen
- Not working at all
- Ne semble pas fonctionner, passe son temps à analyser
- L'app prends énormément de temps à analyser
- AR läuft nicht, erkennt keine Fläche
- Can’t get it to measure anything
Requested features
9 requests- Option to change ruler pips (16/1, 8/1)
- Scrolling ruler for longer objects
- Button to turn on flashlight
- Compatibility for iPad Air 2
- Tutorial or instructions
Show 4 moreShow fewer
- Numeric measurements near the rule
- Ability to take multiple measurements simultaneously
- Dark mode option
- Advanced analytics dashboard
iScan
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ruler / Measuring Tape
No in-app purchases
iScan
No in-app purchases









