Comparison

Ruler vs Document Scanner

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

Head to head
About

Ruler

Measure objects and distances with an on-screen ruler and augmented reality. Supports inches and centimeters, with features for linear sizes, angles, area, volume, and more. Save your measurements for later use.

Highlights
  • On-screen ruler for small objects
  • Augmented Reality (AR) measuring
  • Measure linear sizes in cm/inches
  • Calculate angles, area, and volume
  • Save measurements
  • Generate plan projections
Features
Read full description

Measure everything with a beautiful on-screen ruler.  Choose between inches and centimeters.  Tap the screen to start using the best multi-touch measuring system and find the size of all curious objects around you.  Also with your camera measure everything accurate by using Augmented Reality (AR) feature. 1) Allows to tape measure linear sizes in cm, inches 2) With Bubble meter allows you to level objects horizontal 3) Save measurments 4) Allows to tape measure distance from device camera to a fixed point on the detected 3D plane. 5) Angle – allows to tape measure corners on 3D planes. 6) Area and Perimeter – allows to tape measure perimeter and area of the room. 7) Volume – allows to tape measure size of 3D objects. 8) Path – allows to calculate the length and area of the path. 9) Height – allows to tape measure height relative to the recognized surface. 10) Plan – generates plan projection for drawn objects and exports it . 11) On-screen Ruler app – measure small objects directly on the smartphone’s screen.

About

Document Scanner

Features
Read full description

Turn paper into clean, searchable digital documents. Document Scanner helps you capture paper, import photos or PDFs, correct uneven lighting and perspective, recognize text, and export the result. Keep multi-page documents organized without sending your files to an external processing server. KEY FEATURES • Scan single-page or multi-page documents with the camera • Import multiple images from your photo library • Import PDFs and edit their pages • Automatically detect document edges and correct crop, perspective, and skew • Reduce shadows and uneven lighting for a clearer paper background • Choose Original, Document, Color, Grayscale, or B&W filters • Adjust brightness and contrast, or rotate pages in 90-degree steps • Compare the original and processed page with a slider • Recognize Japanese or English text, with automatic language selection • Run OCR on one page or the full document, copy results, and search recognized text • Remove handwriting on demand and refine the affected area with Erase and Restore brushes • Undo, redo, reset, resize the brush, zoom, and pan while editing • Add, delete, reorder, and save pages as one document • Search saved documents by title or recognized text • Select and delete multiple documents at once • Export and share PDF, PNG, JPEG, TXT, or Markdown files • Choose original size, A4, or Letter for PDFs, plus standard or high quality • Set the appearance, default filter, OCR language, export format, and JPEG quality GREAT FOR • Class handouts, worksheets, and study materials • Receipts, forms, meeting notes, and business documents • Converting multi-page paper documents into PDFs • Copying Japanese or English text from an image • Cleaning up written-on worksheets when you choose to • Finding a saved document from words inside it BUILT AROUND YOUR ORIGINAL The Document filter is applied to new imports to improve readability. Your original image remains available, so you can revisit filter, brightness, contrast, rotation, and handwriting-removal edits. Handwriting removal runs only when you request it. Results depend on the source, and Erase and Restore tools let you adjust the removal area. Documents are stored on your device. After importing or scanning, cleanup, OCR, editing, search, and export work offline. No account, sync feature, or in-app purchase is included. PRIVACY Image processing, handwriting detection, and OCR run locally on your device. Imported images, PDFs, and recognized text are not uploaded to an external server for processing. The app does not include tracking or analytics.

Screenshots

Ruler4 screens
Document Scanner1 screens

Verdict

The call

The clearest difference is price: Ruler at Free against Document Scanner's $2.99. Ruler also leads on iOS requirement (13.0 vs 18.0). Document Scanner's advantage is ads (none vs shown). On 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

CostPrice · In-app purchases · Ads · Monetization

Ruler is free to download; Document Scanner costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard3 real differences · 7 level
Ruler versus Document Scanner: the parameters behind the verdict, then further details
ParameterRulerDocument Scanner
PriceFree — better$2.99
Rating4.2 (419 ratings) — better—
Positive reviews15.2% of reviews—
Number of ratings419 — better—
Update frequencyEvery 14 months—
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better18.0
Further details — not scored
Size6 MB5 MB
Age rating4+4+
DeveloperMatrix Software Co.Moca LLC

Bugs and requests

Ruler

Reported bugs

8 issues
  • App crashes on iPhone 17 and iPad
  • App crashes within 1 minute
  • AR mode not functional
  • Cannot switch to cm
  • Measurements are out of scale
Show 3 more
  • Centimeter measurement is wrong
  • Ruler markings are wrong (10ths instead of 16ths)
  • iPhone 14 Pro Max measured as over 9 inches

Requested features

7 requests
  • Fix crashing issues
  • Enable switching to metric (cm)
  • Improve AR mode usability
  • Add save and print functionality
  • Provide usage instructions
Show 2 more
  • Ensure accurate scaling for all devices
  • Fix ruler marking divisions

Document Scanner

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Ruler

No in-app purchases

None

Document Scanner

No in-app purchases

Questions

Is Ruler free?
Ruler is free to download, with no in-app purchases.
Is Document Scanner free?
Document Scanner costs $2.99, with no in-app purchases.
Do Ruler or Document Scanner have ads?
Ruler shows ads; Document Scanner does not.

Other comparisons