Size test vs Prometheus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Size test
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This app is designed to assess how quickly the user reacts to changes in the size of an object. Users can select one of the test modes: 'Increasing the object', 'Decreasing the object', 'Decreasing or increasing the object'. When the user observes a change in the size of an object, the user must break contact with the device screen. The recorded test time reflects the user's ability to perceive the change in object size. Once the test is completed, the results are tested for normality of distribution (Shapiro-Wilk test). If the values deviate from the law of normal distribution, the program analyzes the data sets, removes the worst value and adds an additional attempt. In the program settings you can select the number of attempts - from 10 to 30. The choice of the number of attempts depends on the performer's age and professional activity. In addition, in the program settings the user can save a backup copy of his measurements in JSON format anywhere (Save backup), add measurements from another device (Add backup), replace already saved measurements with new ones (Replace backup) or delete all data (Delete all data). This application is intended to be used by athletes and teachers in specialized educational institutions for scientific research.
Prometheus
Access a vast library of online courses from top educators in Ukraine, covering business, IT, personal development, and more. Learn new skills, gain certificates, and advance your career with this educational platform.
- Wide range of course topics
- Free and paid course options
- Learn anytime, anywhere
- Downloadable lectures
- Certificates for resume
- Expert instructors
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Master the current skills in online courses from the best teachers on the largest educational platform in Ukraine! Register and take courses in business, IT, English, critical thinking, psychology, history, personal development, project management and other areas! We also have courses for civil servants and educators. Download the mobile application and get access to knowledge that can change your life! Prometheus is the largest online education platform in Ukraine, with 1,500,000 students. In partnership with leading lecturers, companies and international organizations, we create online courses on the most relevant topics. Prometheus will help you: Get the latest skills in any field You will definitely find courses that will interest you, because we have many topics to choose from - from IT and business to psychology. Learn for free and interactively More than 200 courses at Prometheus are free, and the number is growing every month! Adopt the expertise of famous teachers At Prometheus + you will find paid courses from star lecturers who provide access to the best teaching practices of a new level. Learn anywhere and anytime Learn when it's convenient for you! All you need is a computer / smartphone and internet access. Or download lectures and watch them even in his absence! Get a certificate that you can add to your resume Prometheus certificates are valued by potential employers, so you can proudly add them to your resume! Prometheus' mission is to make the best education available to everyone. There is no fee for Internet traffic for users of Lifecell mobile programs (Lifecell Campus program) and Kyivstar (Knowledge without Restrictions program).
Screenshots
Verdict
The clearest difference is price: Prometheus at Free against Size test's $0.99. Prometheus also leads on device support (3 vs 1). On update cadence, ads, in-app purchases and iOS requirement 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
Prometheus is free to download; Size test costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Size test ships an update every 10 months, Prometheus every 16 months. The most recent releases landed on October 29, 2026 and November 2, 2026 respectively.
| Parameter | Size test | Prometheus |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 4.3 (16 ratings) — better |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | — | 16 — better |
| Update frequency | Every 10 months — better | Every 16 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Freemium |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Viacheslav Romanenko | Prometheus NGO |
In-app purchases
Size test
No in-app purchases
Prometheus
No in-app purchases









