Prediction asks 3–4 quick lifestyle questions (height, weight, fit preference) and the AI predicts the shopper’s measurements behind the scenes. Best for shoppers who don’t have a tape measure handy.

Precision asks the shopper to enter their actual body measurements (chest, waist, hips). Best when accuracy matters — fitted clothing, tailored items, lingerie.

Mini example. A shopper buying a relaxed-fit hoodie probably doesn’t want to grab a tape measure — Prediction is the right choice (“I’m 5'8", 160 lb, I like a relaxed fit” → Your size is L). A shopper buying a structured blazer wants a real fit — Precision is the right choice (“Chest 38 in, waist 32 in, hips 39 in” → Your size is 40R).

Yes — this is recommendation memory, included on every Pro plan.

Mini example. A shopper takes the quiz on a t-shirt and is recommended M. They come back two weeks later to a different product with a totally different size table — say a fitted dress with sizes 4 / 6 / 8 / 10. SmartSize remaps their stored measurements against the new chart and shows them Size 8 without asking them to retake anything.

Flat monthly price, no usage charges. Four plans listed on the Shopify App Store:

• Free — $0, 2 size charts, no quiz.
• Starter — $9/mo, 10 charts, advanced design + AI features, no quiz.
• Growth — $12/mo, unlimited charts, no quiz.
• Pro 100 — $19/mo, unlimited charts + the size quiz, up to 100 size recommendations / month.

If you outgrow Pro 100, higher Pro tiers (Pro 250 → Pro 10K) are unlocked in-app and billed through Shopify the same way — no separate checkout. Annual billing saves 20% on every paid plan.

A size recommendation is counted per unique shopper per calendar month. The first time a shopper gets a recommendation in a given month, your quota decreases by one. If the same shopper comes back later that same month and gets another recommendation — even on a different product — your quota does not decrease again.

Mini example. You’re on Pro 100 (100 recommendations/month).

• Shopper A takes the quiz on a hoodie → quota: 99 left.
• Shopper A comes back the next day, takes the quiz on a pair of jeans → still 99 left (same shopper, same month).
• Shopper B takes the quiz on a t-shirt → quota: 98 left.

So “100 recommendations / month” really means up to 100 distinct shoppers per month, with unlimited repeat visits to each.

You’ll know long before it happens. Your current quota is shown live on the SmartSize home page in the admin, and we send email notifications as you get close to your cap so you can plan an upgrade in advance.

If the cap is reached, the quiz is not taken offline — there’s a brief countdown delay of a few seconds in front of the quiz for new shoppers, a soft throttle that nudges merchants to upgrade without hiding the experience. Returning shoppers continue to see their size instantly from recommendation memory with no delay. Upgrading to the next Pro tier is one click and removes the delay immediately.

Yes — annual billing saves 20% on every paid plan.

Mini example. Pro 100 monthly is $19/month. Pro 100 annual is $182.40/year — that’s $15.20/month, a savings of $45.60 a year. The savings compound on higher tiers (Pro 10K saves about $1,200/year).