Metafill is a focused app for missing Shopify product categories and category metafields, with confidence scores and one-click undo. Lumi drafts categories and standard category fields too, alongside descriptions, image alt text, SEO titles, and SEO descriptions, and every category draft waits for your approval.
Quick answer
Choose Lumi when categories are one of several gaps. One run can draft a category and its standard fields for one credit per product, then descriptions, alt text, and SEO fields in the same review queue. Lumi keeps existing categories and filled values unless you ask it to rewrite them, and can restore eligible changes.
Published by Lumi from official vendor documentation. We have not tested these tools side by side. Compare your actual fields and review needs before choosing.
Checked November 3, 2026: Metafill lists one Pro plan at $9.99/month with unlimited products and a 7-day free trial. Lumi uses one credit per product for a category draft set: Free includes 100 monthly credits, One-Time Cleanup is $79 once for 3,000 credits valid 90 days, and Maintain is $19/month for 500 credits, shared with descriptions, alt text, and SEO fields. For categories alone on a large catalog, Metafill's flat price is likely cheaper; Lumi's credits make more sense when the same products also need copy or alt text.
USD before tax. Prices and limits can change. Check official vendor terms and current Lumi plans.
Estimate a large-catalog workloadSide-by-side
Use the table to compare the work each app handles before deciding which one fits your store.
| Criterion | Lumi | Metafill |
|---|---|---|
| Primary job | Find missing image alt text, empty descriptions, and missing SEO fields, create drafts, review them, publish approved updates, and keep generation history. | Find products with no Shopify product category or empty category metafields, suggest values from Shopify's Standard Product Taxonomy, and apply them in bulk. |
| Catalog coverage | Product-image and Shopify Files alt text, product descriptions, SEO titles, and meta descriptions on every plan. Brand voice and a choice of 17 draft languages (one per store) on One-Time Cleanup and Maintain. | The listing covers product categories and category attributes such as color, material, and size, with a catalog completeness score. It does not describe descriptions, alt text, or SEO fields. |
| Review model | Merchant-started batches always create drafts for review. Maintain can automate drafts for new-product content and missing image alt text after product updates; that automation is off until you opt in, then starts set to create drafts for review. | The listing describes a review table with confidence scores, bulk apply, and a logged old value for one-click undo. Lumi shows category drafts as field rows you approve or reject, lists the fields it left blank, and never publishes category drafts automatically, even under Maintain automation. |
| Broader scope | Focused on Shopify product-content cleanup rather than replacing a full SEO, site-speed, or general AI toolkit. | Specializes in categories and category attributes. Launched October 7, 2026, with no App Store reviews when checked. |
| Best fit | Shopify teams that want missing-alt-text detection, selected content drafts, review, publishing, and generation history in one place. | merchants whose only gap is product categories and attributes, and who want an unlimited-product monthly price. |
Lumi's distinction
Lumi is not a complete SEO suite or an accessibility guarantee. It helps Shopify teams find missing alt text, choose other fields to refresh, review drafts, publish approved updates, and keep generation history.
Identify missing image alt text and review storefront findings.
Create suggestions from your product details for merchant review.
Edit and approve proposed content.
Apply approved updates to Shopify fields.
Keep generation history and eligible-plan alt-text exports.
Lumi's Free plan currently includes 100 monthly credits for all four content types, in English. Confirm current plan details on the Shopify App Store.
Not for every store. Metafill is the better fit for merchants whose only gap is product categories and attributes, and who want an unlimited-product monthly price. Choose Lumi when categories are one of several gaps. One run can draft a category and its standard fields for one credit per product, then descriptions, alt text, and SEO fields in the same review queue. Lumi keeps existing categories and filled values unless you ask it to rewrite them, and can restore eligible changes.
Metafill's primary job is to find products with no Shopify product category or empty category metafields, suggest values from Shopify's Standard Product Taxonomy, and apply them in bulk. Lumi is organized around finding missing image alt text, choosing other product fields to refresh, reviewing drafts, publishing approved updates, and keeping generation history.
Choose Metafill when categories and category metafields are the only fields you need to fill; you want a flat monthly price with unlimited products rather than credits; or per-value confidence scores and a catalog completeness score matter to your review.
No. Lumi helps with product-image alt text and search-content cleanup, but accessibility involves the full storefront and search results depend on many factors.
Keep comparing
