Comparison

Perfect OCR vs Diary Calendar

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

Diary Calendar

This calendar app supports the ICS standard for seamless integration with PC calendar software like Outlook and Lightning. It offers detailed date and monthly overviews, allows for time zone-specific appointments, and enables the creation of both one-off and recurring events.

Highlights
  • ICS standard compatibility
  • Date and monthly overviews
  • Time zone management
  • Recurring event creation
  • Searchable appointment list
  • External data storage
Features
Read full description

This app is suitable for calendars according to the ICS standard RFC 5545/5546,  which is used by most computer programs.  This is the prerequisite, so that you can also use your calendar from the PC  with Outlook, Lighting or other software. This calendar inherits the following functions: - Date Overview    All appointments are displayed time-dependent. The list can be searched. The list is kept on the iPhone and can be stored and loaded externally. Appointments can also be transferred from the iPhone - Monthly Overview    Monthly overview helps navigate through calendar dates quickly.  Appointments additional are listed separately.  An overview of appointments of the day couldt be called up on the screen. - Date    Appointments can include date and time or just the date.    These can be stored with or without time zone. So, for example    the date New Year should be used without time zone as the year    actually begins on earth at different times.    In contrast, a birthday with the time zone should be deposited, in    which the jubilarian lives. Thus, at the time of congratulation    nothing goes wrong. - Series date    One-off and serial appointments can be generated.    A recurring event is controlled by a rule by which the repetitive    appointments are generated. These rules fulfill the standard.    So you do not have to dive deeper into the rules, as most common rules could be created by key combination.

Screenshots

Perfect OCR4 screens
Diary Calendar4 screens

Verdict

The call

The clearest difference is review sentiment: Perfect OCR at 65% against Diary Calendar's 33%. Perfect OCR also leads on price ($0.99 vs $2.99). Diary Calendar's advantage is iOS requirement (12.0 vs 16). 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 Diary Calendar $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Perfect OCR ships an update every 2 months, Diary Calendar every 3 months. The most recent releases landed on September 30, 2026 and September 10, 2026 respectively.

Scorecard3 real differences · 7 level
Perfect OCR versus Diary Calendar: the parameters behind the verdict, then further details
ParameterPerfect OCRDiary Calendar
Price$0.99 — better$2.99
Rating4.7 (118 ratings) — better—
Positive reviews64.5% of reviews — better33.3% of reviews
Number of ratings118 — better—
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPodiPhone, iPod
Requires iOS1612.0 — better
Further details — not scored
Size25 MB14 MB
Age rating4+4+
DeveloperPiksoft Inc.Hans Joachim Gerhardt

Customer experience

Perfect OCR

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

Diary Calendar

Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

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

Diary Calendar

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Perfect OCR

No in-app purchases

None

Diary Calendar

No in-app purchases

Questions

Is Perfect OCR free?
Perfect OCR costs $0.99, with no in-app purchases.
Is Diary Calendar free?
Diary Calendar costs $2.99, with no in-app purchases.
Do Perfect OCR or Diary Calendar have ads?
Neither Perfect OCR nor Diary Calendar shows ads.
Which is updated more often, Perfect OCR or Diary Calendar?
Perfect OCR ships an update every 2 months, and Diary Calendar every 3 months. Most recently, Perfect OCR was updated on September 30, 2026 and Diary Calendar on September 10, 2026.

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