Prime AI Clothing Size Finder is a UK size recommender listed on the Shopify App Store since April 2025. The size finder is free; virtual try-on is an optional add-on sold as credits, $12 for 80 try-ons, $45 for 300 and $120 for 800. Its recommendation uses the shopper's age, height, weight, body shape and fit preference, and the company says it also analyses "real purchase data, returns, customer behaviour patterns". Garu estimates measurements from one photo and renders the garment on the shopper. Prime AI facts come from its App Store listing and site on September 21, 2026.
We make Garu, so read accordingly. Where the other side is ahead, this page says so plainly.
The short answer
Choose Prime AI if you want a free size finder that asks a few questions and the option to buy try-on renders in small batches. The listing carries 3.8 stars from six reviews.
Choose Garu if you want the size to come from the shopper's measurements rather than height and weight, and the try-on to be the core product rather than an add-on: front and back on every plan, and on Plus every size rendered.
Side by side
| Garu | Prime AI | |
|---|---|---|
| How you buy | Shopify App Store, self-serve | Shopify App Store, self-serve |
| Published price | Free, $199, $399, Plus from $999 | Size finder free; try-on credits $12/80, $45/300, $120/800 |
| Shopper input | One full-length photo | Age, height, weight, body shape, fit preference; bra size optional |
| Recommendation basis | Measurements matched to your chart | Predictive model over shopper inputs, purchase data and returns |
| Virtual try-on | Rendered, front and back; 360° and every size on Plus | Optional add-on bought with credits |
| Shopify App Store rating | 5.0 ★ (1 review), live since May 2026 | 3.8 ★ (6 reviews), live since April 2025 |
Where Prime AI is genuinely ahead
- Free size finder. No monthly fee for the recommendation. Garu's free tier is 25 try-ons a month, then $199.
- Cheap try-on entry. $12 for 80 renders is a low first step. Look at what kind of render that buys before comparing per-image prices.
- Multi-user profiles. Recommendations for a partner or a child from one account.
Where Garu is built differently
- Measurements, not proxies. Chest, waist and inseam from a photo, not height and weight, and never from past purchases, which go stale as bodies change.
- The render is the product. Front and back on every plan, rendered from a body estimate rather than pasted on the photo.
- Every size on Plus. The M and the L, rendered separately on the same shopper.
The honest decision rule
If you want a free recommender and an occasional render, Prime AI is the cheaper entry. If try-on and sizing are the thing you are buying, Garu is built around them.