FitKit ‑ Size Charts & Guide vs SizeID
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for FitKit, Oct 13, 2026 for SizeID.
The short answer
- Only FitKit lists a free plan. Paid plans start at $6.99/month for FitKit and $19.90/month for SizeID.
- FitKit lists 1 features SizeID’s listing doesn’t mention, including Size charts.
Head to head
Boost your sales with multi-featured size recommender.
Free
Growth
Pro
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 featureSizing doubt is the #1 reason fashion shoppers hesitate, and wrong sizes drive costly returns. FitKit fixes both without slowing your store: the size guide link renders with zero network calls and the modal is under 5 KB, loaded only when a shopper clicks. Start from ready-made templates (tops, pants, shoes, rings, kids), edit rows and columns freely, and let shoppers switch cm/inches automatically.
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.
- Featherweight modal under 5 KB, lazy-loaded — zero impact on store speed
- Ready-made templates with automatic cm/inches switching for shoppers
- Rule-based size recommender — instant, private, no AI (Pro)
- 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 |  FitKit |  SizeID |
|---|---|---|
| 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 | FitKit | SizeID |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | 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
FitKit and SizeID: common questions
- Is FitKit or SizeID cheaper?
- Only FitKit lists a free plan. Paid plans start at $6.99/month for FitKit and $19.90/month for SizeID. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- FitKit lists 1 the others don’t mention, such as Size charts. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- 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 14, 2026 for FitKit, 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 Oct 14, 2026 for FitKit, 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.