Userbrain Recorder vs Principle Mirror
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Userbrain Recorder
Earn money by providing feedback on digital products and services. Record your user experience, share your opinions, and receive invitations to test for global brands. The app only records during active testing sessions, ensuring your data privacy.
- Earn money for feedback
- Record user experience
- Share opinions
- Test global brands' products
- Easy application process
- Data privacy during testing
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The Userbrain app is a great way to earn money for your feedback. Use digital products and services of global brands, record your experience, share your opinions and earn additional income. HOW DOES IT WORK? Becoming a Userbrain tester is a great way to earn a few extra dollars on the side. The application process is easy and can be completed in 3 simple steps: You create an account on tester.userbrain.com and fill out some basic demographic information. You complete a short practice test (We’ll guide you through it step by step). The Userbrain team will then manually review your video and, if everything looks good, approve your request. You’ll then receive invitations to use products and services of global brands, record your experience and share your opinions. IS MY DATA SAFE? The Userbrain app is ONLY active when participating in a testing session. In case you are not actively participating in a session, the app won't record anything nor collect any data. If you have any questions or concerns, please contact us anytime at tester@userbrain.com.
Principle Mirror
Design interactive user interfaces with this companion app for a popular Mac design tool. Seamlessly open Principle files or mirror your Mac's design work directly to your device.
- Open Principle files
- Mirror Principle for Mac
- Interactive UI design
- Companion app functionality
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Principle Mirror is the companion app to Principle for Mac, a tool for designing interactive interfaces. Principle Mirror can open Principle files from other apps or mirror Principle for Mac when plugged in. “I just wanted to write to you quickly just to say — this. is. amazing. while I was watching the first tutorial I got tears in my eyes! seriously.” Hugo Ahlberg Designer, IDEO "This tool is amazing, very well done." Patrick Wong Designer, Lyft
Screenshots
Verdict
The clearest difference is rating: Principle Mirror at 4.2 against Userbrain Recorder's 1.3. Principle Mirror also leads on review sentiment (45% vs 21%) and ratings volume (14 vs 3). Userbrain Recorder's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model 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.
Principle Mirror holds the better App Store score, 4.2 against 1.3. Both are backed by a comparable volume of ratings — 3 and 14 respectively. Written reviews point the same way: 21% of Userbrain Recorder's written reviews are positive against 45% of Principle Mirror's.
Userbrain Recorder ships an update every 3 weeks, Principle Mirror every 2 months. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.
| Parameter | Userbrain Recorder | Principle Mirror |
|---|---|---|
| Price | Free | Free |
| Rating | 1.3 (3 ratings) | 4.2 (14 ratings) — better |
| Positive reviews | 20.5% of reviews | 45.2% of reviews — better |
| Number of ratings | 3 | 14 — better |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 11.0 — better |
| Further details — not scored | ||
| Size | 36 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | Userbrain GmbH | Daniel Hooper |
Customer experience
Userbrain Recorder
Principle Mirror
In-app purchases
Userbrain Recorder
No in-app purchases
Principle Mirror
No in-app purchases
Questions
Is Userbrain Recorder free?
Is Principle Mirror free?
Which has better reviews, Userbrain Recorder or Principle Mirror?
Do Userbrain Recorder or Principle Mirror have ads?
Which is updated more often, Userbrain Recorder or Principle Mirror?
Other comparisons
