How to choose product comparison and sizing apps for Shopify
Shopify files this as product comparison, but under a quarter of it compares anything - it is a sizing shelf. The decision is whether you want to publish a measurement table, recommend a size, or show the garment on a body, because those are three very different costs and only the first is nearly free.
Updated 2026-09-01 · covers 196 product comparison and sizing apps
Key takeaways
- 48 listings are static size charts, 40 recommend a size from body data, 29 are comparison tables and 23 are try-on. The cost ladder runs in roughly that order and it is steep.
- Billing complaints run 6.4% against a 16.4% platform baseline - the lowest of any category we have measured. These vendors do not overcharge.
- Support silence is the leading complaint here at 7.7% against a 5.4% baseline. Small vendors, small tools, not always a reply.
- Every tool here amplifies your source data. A recommender fed inconsistent measurements recommends inconsistently, with more confidence than a blank table would.
- Only 11 of 196 listings have fifty reviews or more.
Which of the three do I actually need?
A static chart is content you already own, published in a popup. A recommender needs consistent per-SKU measurements across the whole catalogue. Try-on needs imagery and carries a per-render cost. Most stores that bought the third had not finished the first.
Count how many of your SKUs currently carry complete, consistent measurements before you shop. If the answer is 'not many', the first purchase is not an app - it is finishing the measurements, and then publishing them free.
Do I need an app for a size chart?
Not necessarily. A size table is content, and it can live in a product metafield rendered by your theme with no monthly fee. The honest sequence is: fix the measurements, publish them free, then decide whether a recurring cost buys you anything beyond a nicer popup.
The apps earn their place when the table has to vary by product type, by region, or by brand, and maintaining that by hand becomes the bigger job. That is a real threshold and most stores reach it eventually - but reaching it is the trigger, not the launch of the store.
What does it do when it is unsure?
The question that separates good recommenders from bad ones. A tool that always returns a size is worse than one that declines, because a confident wrong recommendation produces exactly the return you were trying to prevent.
Test it with an edge case in the vendor's own demo - an unusual combination of measurements, or a product whose fit is genuinely ambiguous. What happens then tells you more than the marketing site does.
How will I know whether it worked?
Return rate on fit, by product, before and after - visible in your own reporting rather than in the app's dashboard. Agree the measurement before you install, because afterwards you have no baseline.
No independent measurement of fit-return reduction exists for any product on this shelf, ours included. Any figure a vendor quotes is a vendor figure. That is not a reason to avoid the category; it is a reason to generate your own evidence during a trial rather than accepting someone else's.
What happens to the data it collects?
Body measurements are personal data, and a size recommender collects them. Ask where it is stored, how long it is kept, and what leaves with you if you switch.
This is the one aspect of the shelf where the regulatory exposure sits with you rather than the vendor. It is also easy to check before installing and impossible to unwind afterwards.
The mistakes that cost most
- Buying a recommender before the catalogue has consistent measurements.
- Paying monthly for a popup around a table you could render from a metafield.
- Accepting a vendor's return-reduction figure as evidence.
- Choosing on rating. Only 11 apps here have fifty or more reviews and none is below 4.0.
- Collecting body measurements without deciding where they are stored.
Questions merchants ask
Is virtual try-on worth it?
It is 23 listings on this shelf and the evidence base for the category is genuinely thin - see the 3D, AR and try-on guide, where only one app in 308 has fifty reviews. Treat it as a paid pilot with a measurement attached rather than a purchase.
Which sizing app do larger stores use?
The reviewer data does not follow review count here. The shelf leader has 1,111 reviews and 8.1% of its ranked reviewers in the global top 100,000; several apps with a tenth of the reviews sit two to three times higher.
Do these slow the product page down?
Less than you would expect. Speed complaints run 5.1% against a 5.6% platform baseline, which is at or slightly below norm.
How we know this
Every figure on this page comes from two sources: the App Store catalogue as of 2026-09-01, and the review bodies of the most-reviewed apps in the category. Complaint rates are compared against a baseline built from all 1,087 mined apps and 12,926 one- and two-star reviews, so a category figure can be read as higher or lower than the platform as a whole. Review text is clustered by theme and paraphrased; no review, merchant name or store domain is reproduced. Where we could not establish something, the page says so.
What the figures rest on
- Catalogue: 196 live listings under Product Comparison, snapshot 2026-09-01, of which 98 have no reviews and 163 have fewer than ten.
- Review corpus: the 11 most-reviewed apps including our own, 2,662 reviews, 78 one- and two-star bodies.
- Complaint rates compared against a pooled baseline of 1,087 mined apps and 12,926 complaint bodies.
The platform baseline these are compared against
Share of 12,926 one- and two-star reviews across 1,087 apps, every category pooled. A category figure only means something next to these.
- Billing, charges and refunds16.4%
- Setup difficulty5.7%
- Page speed5.6%
- Support silence5.4%
- Plan limits and forced upgrades4.5%
- Broke something on the store2.7%
- Residue left after uninstall1.7%
- Data accuracy1%
What this page does not establish
78 complaint bodies across 11 apps is thin; only the billing finding, which is far from baseline, should be leaned on. Several apps in the reviewer comparison carry under 130 reviews, so their percentages rest on small samples - including our own at 12 reviews, which supports no conclusion at all. That a size table can be rendered from a metafield without an app was not confirmed against a primary source in this pass.
How the ranking on this site works
Apps are ordered by how many merchants reviewed them and how well, so the top of a category reflects accumulated use rather than our opinion. That favours apps which have been collecting reviews for years, which is worth remembering when a newer tool is a better fit. Paid placements sit in their own labelled block and never move a row in the ranking below. EcomApps is not affiliated with Shopify.