GravLens3 vs UMStudy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GravLens3
Simulate the effects of gravitational lensing on your iPhone or iPad. Adjust lens parameters and apply distortions to your photos or live camera feed. Share your creations or project them for educational purposes.
- Simulate Hubble Space Telescope images
- Adjust lens size and ellipticity
- Distort photos from library or camera
- Live real-time lensing view
- AirPlay and external monitor support
- Save and share distorted images
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Gravitational lensing is a remarkable astrophysical phenomenon, where the light of a distant galaxy is bent by a massive foreground galaxy. Now you can simulate the effect of a gravitational lens on your iPhone or iPad! With GravLens3, a remarkable and educational tool you can: * Simulate Hubble Space Telescope images of strong gravitational lenses * Adjust the size and ellipticity of the lens model * See the distortion on a picture from your photo library or camera * Save the image, tweet it, post to Facebook, or print it * Live View: view the world through a gravitational lens! Real-time lensing with your camera. * Airplay and external monitor support. Broadcast your lensing to an external projector or Apple TV. Great for lectures! * Retina display, iPhone 6/6 plus all supported.
UMStudy
This app connects university students with academic support services. Students can book tutor appointments, join study groups, and attend peer-led sessions to enhance their understanding of course material and achieve academic goals.
- Book tutor appointments
- Attend drop-in sessions
- Find study groups
- Peer-led study sessions
- Collaborative learning environments
- One-on-one academic support
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University of Michigan's UMStudy App connects students to academic resources to optimize learning. You can now use the app to book appointments with Tutors, attend drop-in sessions, and find Study Groups. Peer-led study sessions provide opportunities for students to meet in collaborative group or one-on-one environments, develop academic success strategies, better understand course concepts, and achieve educational objectives.
Screenshots
Verdict
The clearest difference is rating: UMStudy at 5.0 against GravLens3's 3.7. UMStudy also leads on update cadence (every 2 months vs every 17 months). GravLens3's advantage is device support (3 vs 1) and ratings volume (6 vs 2). 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.
UMStudy holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 6 and 2 respectively.
GravLens3 ships an update every 17 months, UMStudy every 2 months. The most recent releases landed on September 29, 2026 and October 2, 2026 respectively.
| Parameter | GravLens3 | UMStudy |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (6 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 6 — better | 2 |
| Update frequency | Every 17 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 6.1 — better | 26.0 |
| Further details — not scored | ||
| Size | 4 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Eli Rykoff | Tedu, LLC |
Customer experience
GravLens3
UMStudy
In-app purchases
GravLens3
No in-app purchases
UMStudy
No in-app purchases
