ProgressLens vs Spren
A one-off scan or rating, or a running read of your own progress? Here’s how they differ.
Short answer
Spren a guided body composition scan with lean mass, fat mass and a downloadable report. ProgressLens is an AI progress photo app for iPhone and Android: it reads your photos together with your tape measurements, so its body-fat range stays steady, and every Progress Report says what changed, whether you’re losing fat or muscle, and whether to cut, lean bulk, recomp or maintain. Pick Spren for a detailed body composition report from a guided scan; pick ProgressLens to track whether it’s working and what to do next, on any phone, in 11 languages.
Disclosure: we make ProgressLens. Details about other apps come from their own store listings and websites as of November 2026; prices and features change, so check the listing before you pay. We name each app’s weaknesses and our own.
| ProgressLens | Spren | |
|---|---|---|
| Platforms | iPhone, iPad, Android | iPhone |
| What the AI gives you | Body-fat range, what changed, fat vs muscle, cut / lean bulk / recomp / maintain | Phone-camera body composition scan with PDF reports and AI coaching |
| Body fat based on | Photos + tape measurements + your history | Photos |
| Same photos, same result | Yes | Not stated |
| Languages | 11 | Check listing |
| Matching help | Ghost overlay + grid | See listing |
| Price | $39.99/year with a 14-day free trial, or $7.99/month | Subscription (one of the pricier options) |
| Account and storage | No account; analyzed photos not stored or used for training | Processed in the cloud per its listing |
Choose Spren if…
you want a detailed body composition report from a guided scan.
Choose ProgressLens if…
you want to know whether your progress is working and what to do next: a steady body-fat range from photos plus tape, what changed since last time, a fat vs muscle check, and a clear cut or bulk verdict, on iPhone or Android, in your language, without an account.
Why photos plus tape beat a single scan
Photo-based body fat estimates move with lighting, pump, pose and clothing, so two scans a week apart can disagree by several points. In our analysis of Reddit posts, people quoting estimates from different AIs saw gaps of 2 to 8 points. ProgressLens anchors the photo read with the US Navy tape formula and your history, and the same photos always give the same result.
FAQ
Frequently asked questions
Is there an Android alternative?
Yes. ProgressLens runs on Android and iPhone with the same AI Progress Report on both.
Is there a Spren alternative that uses tape measurements too?
ProgressLens Pro is $39.99 a year with a 14-day free trial, and reads your photos plus tape measurements every check-in.
Sources
- Spren store listing, accessed November 2026
- ProgressLens: this website and the released apps, November 2026