Comparison

Polygraf vs Pravopis

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

Head to head
About

Polygraf

Features
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ABOUT POLYGRAF Polygraf system brings universal access to lectures, presentations, business meetings and any other kind of events. Even though the main target group are hearing and visually impaired users, the application can provide in the same time helpful features for all audience. Polygraf enables: 1. to display real-time transcript of speech (speech-to-text reporting, CART service) in user’s hand continuously; 2. to display content of presentation screen in user’s hand with option to attach the transcript of speech as subtitles (closed captions). HOW IT WORKS A professional speech-to-text reporter (CART writer) transcribes real-time spoken word into text using Polygraf Writer application which is another part of Polygraf system (see www.teiresias.muni.cz/polygraf) and the text is broadcasted via a wireless network. In the same time, content of presentation screen provided by a presenter’s computer is captured and broadcasted via the same wireless network as well. This mobile app can receive and display both resources. Note: Establishing both services in parallel is not a requirement; internet connection is not required. WHAT ARE BENEFITS FOR USERS 1. Users can follow the speech-to-text transcript on a mobile device continuously - it allows rather more comfortable and independent use of the speech-to-text service than reading the text from transcriber’s computer or from a central screen in the front; more than one mobile devices can be connected, so more users can follow the transcript in the same time. Features: - view options of the text (font family, size and color, line-spacing) - scroll the text back to display earlier portions of it - basic two-way communication (users can send text messages to speech-to-text reporter) 2. Users can view the content of presentation screen in hand on a mobile device - it brings the legibility of presentations when there is any difficulty to read it from a distance (user’s visual impairment, small size of the presentation, bad light conditions etc.). Features: - view options of the presentation (zoom, color-inverting, B/W scheme) - image refresh rate - option to attach the transcript of speech as subtitles (closed captions) For further information on other parts of Polygraf system, see www.teiresias.muni.cz/polygraf. Support Centre for Students with Special Needs Masaryk University

About

Pravopis

This app offers a modern way to practice Czech spelling, ideal for quick sessions on the go. It includes cheat sheets for common grammar challenges and a personalized tutor feature that creates custom tests based on your past performance. Track your progress with detailed statistics and improve your language skills.

Highlights
  • Personalized test creation
  • Grammar cheat sheets
  • Progress tracking statistics
  • Customizable tests
  • On-the-go learning
Features
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Pravopis is a short daily spelling trainer for Czech, Slovak, Polish, and Croatian. Five minutes, and you see exactly where your writing slips. Each language has its own trouble spots — i/y in Czech and Slovak, ó/u and rz/ż in Polish, ije/je and č/ć in Croatian. Every mistake comes with an explanation, not a score at the end. WHAT YOU GET • A daily goal and streak so you come back • A mistake log that sends you back to what you miss • Dictation and a check of your own text • Lektor: detailed explanations and drills from a topic or from your own writing The free plan has a daily limit. Pravopis+ unlocks Lektor, text checking, custom drills, and unlimited quizzes. Manage the subscription in your Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For students, parents, and adults who want to write with more confidence.

Screenshots

Polygraf3 screens
Pravopis4 screens

Verdict

The call

The clearest difference is in-app purchases: Polygraf at none against Pravopis's 4. Polygraf also leads on iOS requirement (9.0 vs 17.0). Pravopis's advantage is update cadence (every 2 weeks vs every 6 months). On price, ads 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

Both are free to download. Pravopis sells 4 in-app purchases, starting at $2.99 per month. Polygraf asks for nothing beyond the download.

UpkeepUpdate frequency

Polygraf ships an update every 6 months, Pravopis every 2 weeks. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard3 real differences · 6 level
Polygraf versus Pravopis: the parameters behind the verdict, then further details
ParameterPolygrafPravopis
PriceFreeFree
Rating—4.0 (3 ratings) — better
Number of ratings—3 — better
Update frequencyEvery 6 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.0 — better17.0
Further details — not scored
Size40 MB5 MB
Age rating4+4+
DeveloperMasaryk UniversityMatej Novak

In-app purchases

None

Polygraf

No in-app purchases

4 purchases

Pravopis

Subscriptions2
  • Pravopis+ monthly$2.991 Month
  • Pravopis+ yearly$22.991 Year
One-time2
  • Kategorie Velká a malá písmena$0.99
  • Lektor a Statistiky$1.99

Questions

Is Polygraf free?
Polygraf is free to download, with no in-app purchases.
Is Pravopis free?
Pravopis is free to download, with in-app purchases available.
Do Polygraf or Pravopis have ads?
Neither Polygraf nor Pravopis shows ads.
Which is updated more often, Polygraf or Pravopis?
Polygraf ships an update every 6 months, and Pravopis every 2 weeks. Most recently, Polygraf was updated on November 6, 2026 and Pravopis on November 1, 2026.

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