PsyPad vs MyMetraKey
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
PsyPad
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PsyPad is an open source platform for facilitating visual psychophysics experiments on an iPad. Using customisable staircases or MOCS, the researcher can control presentation of any stimuli that can be precomputed as PNG image files, including movies. Features include participant accounts, up to 4 response buttons, comprehensive log files, and remote test configuration using the PsyPad server. A demo mode with access to a public gallery of tests also makes PsyPad useful for teaching. The project is open source, with repositories for the application code and example server code. https://github.com/davidlawson/PsyPad https://github.com/davidlawson/PsyPad-Server
MyMetraKey
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The MyMetraKey (MMK) app gives you the freedom to remotely book, use and manage your Metra smart locker via your smartphone. With one click your locker will unlock and the locker doors will spring open (or unlock, in case of using Metra's push-open smart lock). Remote, touchless and secure. Almost magic like. The MMK gives total freedom to both staff and management. Pre-book/allocate a locker to have one waiting for you on arrival, assign cleaning and/or maintenance of your lockers, and also open your locker for other staff members when working remotely (or when on a well-deserved vacation). Use the MMK app in your office, school, hospital and elsewhere as a sole 'key' for your locker or in combination with your access card/badge. The MMK app can be used with personal and shared/group lockers (when you have access to a group locker). The MMK app is suitable for all working and other environments, from traditional to highly dynamic ones (ABW).
Screenshots
Verdict
The clearest difference is update cadence: MyMetraKey at every 2 months against PsyPad's every 4 months. MyMetraKey also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PsyPad ships an update every 4 months, MyMetraKey every 2 months. Both last shipped on October 26, 2026.
| Parameter | PsyPad | MyMetraKey |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPad | iPhone, iPad, iPod โ better |
| Requires iOS | 13.5 | 12.1 โ better |
| Further details โ not scored | ||
| Size | 4 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Turpin | Metra d.o.o. |
In-app purchases
PsyPad
No in-app purchases
MyMetraKey
No in-app purchases









