Stronger: AI Muscle Filter

Body editor for gym photos

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Pick one of nine looks and see your muscular self in seconds, with a before/after slider. Your photo is never stored on our servers. Upload a photo and see how another body would look on you. Stronger uses generative AI to hand your own photo back with more mass, sharper definition or a leaner shape — and lets you compare before and after by dragging across the same image. NINE LOOKS, ONE TAP Bulk, Cut and Lean, each in three levels. All of them sit on the same screen: pick one and the image is generated right there, without switching screens or filling in forms. Not convinced? Tap another one. BEFORE AND AFTER, ON THE SAME PHOTO The slider runs across the image under your finger. No collages, no frames: the same photo, split wherever you want it. YOUR RESULTS, ON YOUR PHONE The app keeps your last 30 results in its own gallery, on the phone itself, and you can reopen any of them in the comparator whenever you like; once you reach 30, the oldest one makes room for the new one. You can delete them all at once from Settings. WHAT WE DO WITH YOUR PHOTO, NO SMALL PRINT Your photo leaves your phone encrypted, goes through an automatic safety check at Google, then to our AI provider to generate the result, and the result goes through that same check before you see it. It is never stored on Stronger's servers. Before your first upload we tell you exactly who processes the image and under whose policies. No accounts, no sign-up, no ads. EVERY RESULT IS MARKED AS AI Because EU law requires it and because it is the honest thing to do. On the free tier the result also carries the app's visible mark. And there is a report button right on the result screen. FREE AND PRO Free: 3 generations a day, with a 10-second wait between them, and no saving or sharing. Pro: up to 20 a day and 150 a month under fair use, saving and sharing, and no waiting. The subscription is billed monthly or yearly and comes with no free trial: the price in your own currency is right there on the subscription screen, before you decide. SIX LANGUAGES English, Spanish, French, German, Italian and Portuguese. 18+ only. Upload photos of yourself, or of adults who have given you permission. Results are AI-generated fantasy images for entertainment: they predict no real physical change, and the app gives no medical, fitness or nutrition advice. Terms of Use (EULA): https://julenlara.dev/stronger/eula Privacy Policy: https://julenlara.dev/stronger/privacy

Ratings & Reviews

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Editor polish and the fixes that got in the way most: • Your remaining photos now update straight away, without waiting for you to pick an image. • Going Pro grants the higher daily allowance on the spot. • Restore purchases now tells you what actually happened. • Redrawn save and undo buttons, and style thumbnails you can finally tell apart. • New app icon.

Version 1.1.0

The developer, Julen Lara Trigo, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
    • User Content
    • Identifiers
    • Usage Data
    • Diagnostics
    • Other Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Julen Lara Trigo
Size
  • 47.1 MB
Category
  • Photo & Video
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 10 more
  • English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Spanish, Turkish
Age Rating
18+
  • 18+
  • Learn More
  • Frequent
    Sexual Content or Nudity

    Infrequent
    Mature or Suggestive Themes

    Contains
    User-Generated Content
In-App Purchases
Yes
Copyright
  • © 2026 Julen Lara Trigo
  • Developer Website
  • Privacy Policy
  • License Agreement

    • More by Julen Lara Trigo