Perfect OCR vs RPN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- 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
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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
Verdict
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
Perfect OCR costs $0.99 and RPN $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
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.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.
| Parameter | Perfect OCR | RPN |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 4.7 (118 ratings) | 5.0 (7 ratings) — better |
| Positive reviews | 64.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 118 — better | 7 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 16 | 12.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Piksoft Inc. | CuVee Software |
Customer experience
Perfect OCR
RPN
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
Perfect OCR
No in-app purchases
RPN
No in-app purchases









