DerFit ‑ Size Recommender vs WeeFizz Size Recommender
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026 for DerFit, Oct 23, 2026 for WeeFizz Size Recommender.
The short answer
- Paid plans start at $29/month for DerFit and $59/month for WeeFizz Size Recommender.
Head to head
Starter
- · 500 monthly scans
- · AI-powered sizing
- · Category-based fit logic
Growth
- · 3,000 monthly scans
- · AI body scan & perfect size
- · Custom feedback settings
Solo
- · 500 recommandations / mois
- · Marque blanche et personnalisations
- · Statistiques d'usage
Studio
- · 2000 recommandations / mois
- · Marque blanche et personnalisations
- · RDV de 30 min
- · Statistiques d'usage
Agency
- · Marque blanche et personnalisations
- · RDV de 30 min
- · Recommandations illimitées
- · Statistiques d'usage
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureSizing guesswork costs you sales and sends returns through the roof. DerFit fixes that at the source. Unlike simple size quizzes, DerFit uses a real AI body scan — your customers take 4 quick photos, and DerFit matches their real body measurements against your garment specs for a precise size recommendation at checkout. Not a guess. Real measurements, every time. Fewer wrong sizes, fewer returns, higher margins.
WeeFizz aide vos clients à trouver leur taille idéale en quelques secondes, sur la fiche produit. À partir de quelques informations (taille, poids, âge, morphologie) ou d'une photo, WeeFizz calcule leurs mensurations et recommande la bonne taille selon votre grille. Résultat : plus de confiance à l'achat, plus de conversion et moins de retours dus aux erreurs de taille.
- AI-powered body scan delivers precise size recommendations on product pages.
- Custom admin size rules to map measurements to sizes per product.
- Easy setup — add size widget to any product page in minutes
- La bonne taille recommandée à chaque client, sur la fiche produit
- Moins de retours et d'échanges liés aux erreurs de taille
- Plus de confiance à l'achat et un meilleur taux de conversion
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  DerFit |  WeeFizz Size Recommender |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | DerFit | WeeFizz Size Recommender |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 1 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | DerFit | WeeFizz Size Recommender |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $29/month(ahead) | $59/month |
| Longest free trial | 30 days | 14 days |
| Plans listed | 2 | 3 |
Listing
| Measure | DerFit | WeeFizz Size Recommender |
|---|---|---|
| Shopify category rank | #199(ahead) | #438 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | May 24, 2026 | Sep 23, 2026 |
| Languages | 1 | 1 |
| Developer | DerFit | WeeFizz |
FAQ
DerFit and WeeFizz Size Recommender: common questions
- Is DerFit or WeeFizz Size Recommender cheaper?
- Paid plans start at $29/month for DerFit and $59/month for WeeFizz Size Recommender. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 13, 2026 for DerFit, Oct 23, 2026 for WeeFizz Size Recommender; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 13, 2026 for DerFit, Oct 23, 2026 for WeeFizz Size Recommender. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.