Comparison

Perfect OCR vs RPN

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

Head to head
About

Perfect OCR

Scan and convert documents into editable text with high accuracy. This app offers advanced image processing for clear scans, supports multiple languages for OCR, and allows easy sharing of documents as PDFs or text files. All processing is done offline for enhanced privacy.

Highlights
  • High-accuracy OCR for documents
  • Advanced image processing for clear scans
  • Email documents as PDF with text or image
  • Offline processing for data privacy
  • Multi-language OCR support
  • Automatic document edge detection
  • SureScan mode for jitter-free images
Features
Read full description

Perfect OCR gives you both a general purpose OCR app and a document scanner. Now you can scan and OCR your letter-size or A4 documents with an accuracy of 90% or more, edit, copy and store the recognized text, and e-mail your documents as PDF files with text, SINGLE page image, or both together! NOTE: To ensure the advertised results it is important that you follow the OCR TIPS below (or in the app's help). Perfect OCR scans your documents using advanced image-processing algorithms to eliminate uneven lighting and shadows and improve contrast. The result is the clearest and most readable scans possible from the iPhone's camera. Perfect OCR also offers SureScan, our proprietary scanning mode that delivers sharper images with less jitter or smear. Our unique "Email to myself" feature lets you send documents to a predefined address, or even upload them to an online storage service like Evernote or Box.net, with a single tap. Uploading documents to online services via email is fast, secure, and can be done even if you're temporarily off line. Refer to app help for details. All processing happens on your iPhone, and the confidentiality of your data is never compromised. There is also no subscription fee, and no Internet access is needed to scan documents or run OCR. PERFECT OCR FEATURES: • Letter-size or A4 page OCR with accuracy of 95% for model 3GS, 98% for iPhone 4, and up to 90% for 3G • OCR languages: English, French, Spanish, German, Dutch, Italian, Portuguese, Swedish, Russian, Polish, Hungarian, Czech and Ukrainian. • Email multipage PDFs with text, SINGLE page image, or both • Automatic document edge detection and perspective correction • Multipage text recognition with accuracy indicator • Text editing and copy-to-clipboard operations • Built-in OCR text archive with file sharing via iTunes • "Email to myself" feature • Email text and image files (.TXT + .JPG), or save image to library • Searchable PDFs with document images (single page) • Preserves simple text formatting • Option to auto-remove line breaks • SureScan mode for jitter-free scans • Simple yet powerful user interface • Instant brightness, rotation, and color controls • Compact attachments with adjustable size IMPORTANT TIPS FOR OCR: • Make sure your document is flat and well lit. Hold your iPhone still while shooting. • Always scan documents using "SureScan 3x" mode. • Glossy paper may not work well (avoid glare). • When scanning books keep the pages as flat as possible and your iPhone parallel to the surface. • Perfect OCR cannot recognize handwritten, very large text or spreadsheets correctly. • Make sure to select the right language for OCR in app settings. We're constantly improving Perfect OCR, and we value our customers' opinions and feedback. Please contact us at support@turboscanapp.com. If you have a problem with our software, please contact us before submitting a comment to the app store. We can solve most of the problems, but we cannot respond to comments.

About

RPN

This app is a photo-realistic simulation of a classic Hewlett-Packard programmable business calculator. It offers advanced programming features, extensive register memory, and a library of pre-installed programs for various financial and statistical calculations.

Highlights
  • Photo-realistic look-and-feel
  • Programmable with subroutines and flags
  • 20 registers with unlimited store/recall
  • Indirect register addressing
  • Program library and sharing
  • Financial and statistical functions
  • Date and calendar calculations
Features
Read full description

RPN-38 CX is the first photo-realistic simulation of Hewlett-Packard's popular high-end programmable business calculator HP-38C for the iPhone. Produced from 1979 through 1983, it was the "Chive" member of the third-generation HP calculators known as the "Spice" series. While the simulator works like the original calculator, a number of carefully designed extensions make it a lot easier to use. RPN-38 CX is fully compatible with the HP-12C, except for calculations and programs involving Bonds and Depreciation. Features: • Photo-realistic look-and-feel • Programmable (99 steps, program memory not shared with register memory) • Subroutines, flags, loop control, extended conditional branching • Insert and delete steps with automatic address correction • 20 registers, "continuous", with unlimited store/recall arithmetic • Indirect register addressing • Register view • Program listing view • Program library view • Additional functions (nominal and effective interest rate) • Shortcuts for often-used key combinations • Store and retrieve any number of programs • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • 40 programs pre-installed Calculator functions: • Percentage (%, ∆%, %Total) • Simple and Compound Interest • Optional odd periods (like HP-12) • Nominal/Effective interest rate conversion • Amortization • Discounted Cash Flow Analysis • Net Present Value, Internal Rate of Return • Date and Calendar (actual or 30/360 day basis) • Statistics (mean, weighted mean, standard deviation) • Linear Regression • Additional functions not found on the HP-38: - Subroutines, flags, loop control, random number, Pi, Log, x² and more Details: cuveesoft.ch/rpn38

Screenshots

Perfect OCR4 screens
RPN4 screens

Verdict

The call

The clearest difference is review sentiment: RPN at 100% against Perfect OCR's 65%. RPN also leads on rating (5.0 vs 4.7) and iOS requirement (12.0 vs 16). Perfect OCR's advantage is ratings volume (118 vs 7) and price ($0.99 vs $1.99). On update cadence, ads, in-app purchases and monetization model 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

Perfect OCR costs $0.99 and RPN $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RPN holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Perfect OCR has 118 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 65% of Perfect OCR's written reviews are positive against 100% of RPN's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
Perfect OCR versus RPN: the parameters behind the verdict, then further details
ParameterPerfect OCRRPN
Price$0.99 — better$1.99
Rating4.7 (118 ratings)5.0 (7 ratings) — better
Positive reviews64.5% of reviews100.0% of reviews — better
Number of ratings118 — better7
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPod
Requires iOS1612.0 — better
Further details — not scored
Size25 MB12 MB
Age rating4+4+
DeveloperPiksoft Inc.CuVee Software

Customer experience

Perfect OCR

All ratings118 ratings
Positive94.9%
Neutral2.5%
Negative2.5%
Written reviews409 reviews
Positive64.5%
Neutral8.1%
Negative27.4%

RPN

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Perfect OCR

Reported bugs

3 issues
  • Crashes on iOS 4 devices
  • Issues with image capture and orientation
  • Inconsistent OCR performance

Requested features

5 requests
  • Support for more languages
  • Improved OCR accuracy
  • Ability to process multiple pages at once
  • Integration with cloud storage and productivity apps
  • Spell check and editing tools

RPN

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Perfect OCR

No in-app purchases

None

RPN

No in-app purchases

Questions

Is Perfect OCR free?
Perfect OCR costs $0.99, with no in-app purchases.
Is RPN free?
RPN costs $1.99, with no in-app purchases.
Which has better reviews, Perfect OCR or RPN?
RPN is rated higher. Perfect OCR averages 4.7 out of 5 from 118 ratings, while RPN averages 5.0 from 7 ratings.
Do Perfect OCR or RPN have ads?
Neither Perfect OCR nor RPN shows ads.
Which is updated more often, Perfect OCR or RPN?
Perfect OCR ships an update every 2 months, and RPN every 2 months. Most recently, Perfect OCR was updated on November 1, 2026 and RPN on October 31, 2026.

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