DerFit ‑ Size Recommender vs FitGenius: AI 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.
The short answer
- Only FitGenius lists a free plan. Paid plans start at $29/month for DerFit and $9.99/month for FitGenius.
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
Free
- · 1 size chart, rule-based engine
- · 5 recommendations per month
Basic
- · 500 recommendations, unlimited charts
Pro
- · 5,000 recs, AI engine, photo analysis
Enterprise
- · 25,000 recs, priority support, API
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.
Sizing uncertainty is a top cause of returns and abandoned carts. FitGenius adds a size recommendation widget to product pages: shoppers answer 3 quick questions on height, build, and fit preference, and get a recommendation with a confidence score and reasoning. Unlike static size charts, recommendations are specific to each product. Build size charts from templates, CSV, or manual entry.
- 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
- Instant size recommendations via a measurement-based engine or AI analysis
- Create size charts from templates, CSV import, or manual entry
- Analytics dashboard showing recommendation volume, size distribution, and trends
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 |  FitGenius |
|---|---|---|
| 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 | FitGenius |
|---|---|---|
| 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 |
FAQ
DerFit and FitGenius: common questions
- Is DerFit or FitGenius cheaper?
- Only FitGenius lists a free plan. Paid plans start at $29/month for DerFit and $9.99/month for FitGenius. 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; 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. 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.