Polygraf vs SpaceOver
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Polygraf
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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
SpaceOver
Experience a guided space journey using advanced accessibility features like VoiceOver and spatial sound. Explore celestial bodies with interactive 3D models and unique soundscapes, making space travel accessible to everyone.
- AR-guided celestial object location
- Unique music for each astronomical object
- 3D models of celestial bodies
- VoiceOver support for all features
- Spatial sound for location guidance
- Interactive space travel
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SpaceOver uses VoiceOver, spatial sound, haptics, etc. SpaceOver makes it possible for the blind and visually impaired(BVI) to go on a space journey. [Navigation function] - Utilizes the AR function to guide the location of astronomical objects in the solar system based on the current user's location. - Each astronomical object has its unique music, which together creates the harmony of our universe. - You can move your phone to find a specific astronomical object and enjoy the music of that object. [Search function] - You can find the object by selecting the object you want to find. - You can receive guidance on where to go through voice-over, and you can feel the location of celestial bodies through spatial sound. [Astro travel function] - If you find specific astronomical objects, you can travel to those objects. - You can enjoy the appearance of astronomical objects as a 3D model. - You can enjoy the space journey through voice-over and music. [Voice Over] - The VoiceOver function is supported for all aspects of the app so that everyone can travel through space without any trouble. Developed by. Sohyeon Kim, Junhyuk Park, Hyemin Seok, Heeji Sohn, Seik Oh, Yoonyoung Lee, A-young Jo Designed by. A-young Jo Music composed by. Hyemin Seok, A-young Jo
Screenshots
Verdict
The clearest difference is iOS requirement: Polygraf at 9.0 against SpaceOver's 15.0. On price, update cadence, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Polygraf ships an update every 6 months, SpaceOver every 5 months. The most recent releases landed on October 2, 2026 and September 29, 2026 respectively.
| Parameter | Polygraf | SpaceOver |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 6 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 40 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Masaryk University | Hyemin Seok |
In-app purchases
Polygraf
No in-app purchases
SpaceOver
No in-app purchases









