EchoVis Street vs Mathematicus Parvus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EchoVis Street
An audio-based game designed to enhance hearing skills, particularly for visually impaired individuals. Players navigate virtual environments by analyzing traffic sounds to avoid obstacles. It can also serve as an educational tool for understanding the blind perspective.
- Audio-based gameplay
- Traffic sound simulation
- Virtual road crossing challenges
- Text-to-speech integration
- Educational tool for spatial orientation
- Multiple game levels
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EchoVis Street is a simple audio game, aimed for blind and visually impaired people. The main goal of this game is to present one of many possibilities of use the mobile devices to develop ability to use hearing skills by visually impaired people. We recommend sight persons also to try their skills in this area. This game consist several levels, each with a different traffic sounds simulation. The player's main objective is to cross the road in the virtual environment avoiding to be hit by a passing car or tram. This should be done in base of acoustic informations analysis arriving to the player's ears. Therefore, we recommend playing with stereophonic headphones connected to your smartphone and without looking at mobile phone screen. All of the necessary communicates are being read with use of text to speech synthesizer In our opinion, this application can be successfully used, for example, by spatial orientation instructors or trainers conducting training in explaining to sighted people the way the blind perceive the world. To reach this goal, we have planned to create 3 games in the EchoVis project boundaries - more information can be obtained on www.echovis.tt.com.pl website. We encourage you to provide us with your opinions, ideas, application functionality issues, etc. Watch out for speeding cars and trams.
Mathematicus Parvus
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Mathematicus Parvus is an app to practice and encourage mental arithmetic. The app is easy to use and fully accessible using VoiceOver. Add and subtract to 10, 100 or 1000. Multiply and divide with numbers from 1 to 12. Fun auditory and visual effects. Don't hesitate to try the app for free.
Screenshots
Verdict
The clearest difference is iOS requirement: EchoVis Street at 15.0 against Mathematicus Parvus's 17.0. 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. EchoVis Street sells 3 one-off in-app purchases and Mathematicus Parvus sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | EchoVis Street | Mathematicus Parvus |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 197 MB | 1 MB |
| Age rating | 12+ | 4+ |
| Developer | Transition Technologies S.A. | Kristof Nijs |
In-app purchases
EchoVis Street
- Small payment$0.99
- Medium Payment$2.99
- Large payment$4.99
Mathematicus Parvus
- Purchase of the app$0.99
Questions
Is EchoVis Street free?
Is Mathematicus Parvus free?
Do EchoVis Street or Mathematicus Parvus have ads?
Which is updated more often, EchoVis Street or Mathematicus Parvus?
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