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.

What’s New

Version 3.2

Camera now works on iOS8 + iPad

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

A. Designer ,

Needs an update for ios 11

This is a fantastic app when it works - but it doesn't save your edits reliably. It keeps saving the unedited source.


11/18: iOS 12.1 on a new iPhone X - still isn't working properly. It allows you to manipulate the image to your heart's content, but will not save anything but the source image. Very disappointing. Used to be a great app.

CptSteiny ,

Excellent app

Does exactly what it says. Yes, it is somewhat like some Photoshop effects, but this is real physics. And cool physics at that!

ChuckKeeton ,

Great app

Well done! Easy to use, instructive, and fun.


Eli Rykoff
3.7 MB

Requires iOS 6.1 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Eli Rykoff


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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