SAIZ ‑ Size & Fit Recommender vs SizeID
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026 for SAIZ, Oct 13, 2026 for SizeID.
The short answer
Head to head
Instant & accurate size recommendation for fashion products
Boost your sales with multi-featured size recommender.
- Germany
- Poland
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
XSMALL
- · Recommendation based on body sizes
- · Up to 20 size charts for your products
- · Up to 300 uses of SizeID Advisor
SMALL
- · Recommendation based on body sizes
- · Up to 1 000 uses of SizeID Advisor
- · Up to 50 size charts for your products
MEDIUM
- · Recommendation based on body sizes
- · Up to 100 size charts for your products
- · Up to 5 000 uses of SizeID Advisor
LARGE
- · Recommendation based on body sizes
- · Up to 20 000 uses of SizeID Advisor
- · Up to 200 size charts for your products
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureSAIZ combines your exact product specs with 65M+ real customer body profiles, delivering unmatched sizing accuracy at scale. Our Recommender adapts to your products, categories, and markets, offering truly personalized size recommendations and forming the foundation for powerful analytics.
Reduce returns and costs associated with them and increase the conversion of your store with the new SizeID Advisor SMART! Recommendation based on simple customer data: height, weight and age. Give your customers assurance from shopping and get useful data from purchases. SizeID Analytics offers you a number of data analysis tools that allow you to better optimize and plan.
- Help your customers choose the right size when shopping with you.
- Reduce returns based on a 1:1 match between your customers and your products.
- Fit consistency across all products: learn from your best and worst performers.
- Know what your customers look like and which sizes they shop & return.
- 6000+ size charts of 750+ brands. Possibility to create your own.
- Easy size recommendations based on height, weight, and age.
- Size recommendations based on accurate body measurements.
- Family and friends connection to get recommendation even for them.
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 |  SAIZ |  SizeID |
|---|---|---|
| Detected stores | 8 | 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 | Apparel & Accessories | Not published |
| Top store countries | Germany, Poland | Not published |
Reviews
| Measure | SAIZ | SizeID |
|---|---|---|
| App Store rating | 2.0 ★ | Not published |
| App Store reviews | 2 | 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
SAIZ and SizeID: common questions
- 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 Nov 9, 2026 for SAIZ, Oct 13, 2026 for SizeID; 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 Nov 9, 2026 for SAIZ, Oct 13, 2026 for SizeID. 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.