Both tools can help Shopify teams improve image alt text. AltText.ai focuses on alt text across several platforms; Lumi connects alt text with selected product-content drafts, review, publishing, generation history, and completed alt-text records inside Shopify.
Quick answer
Lumi is the stronger fit when alt text is one part of a Shopify-only process that also includes selected product-description and SEO drafts, review, publishing, generation history, and completed alt-text records.
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 October 3, 2026: AltText.ai lists the first 25 images free, $5/month for 100, $19/month for 500, $59/month for 2,000, and $3 per 50-image one-time pack. For 1,000 new alt texts with no existing balance, $19 plus ten $3 packs is $49 before any free allowance; verify pack applicability. Lumi can draft up to 100 alt texts within its 100 free monthly credits, or use $79 Cleanup with 2,000 shared credits valid 90 days. A 5,000-image job exceeds one Cleanup allowance. Choose by image coverage, automation, and review needs as well as price.
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 | AltText.ai |
|---|---|---|
| Primary job | Find missing image alt text, empty descriptions, and missing SEO fields, create drafts, review them, publish approved updates, and keep generation history. | Automatically generate alt text for ecommerce images using image and product context. |
| Catalog coverage | Product-image alt text, product descriptions, search titles, and meta descriptions. Available features vary by plan. | Covers product, collection, blog, theme, and product-description images through its Shopify integration. |
| 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; enabled automation can publish automatically after you opt in. | Can add alt text in the background and offers settings for skipping or overwriting existing text. |
| Broader scope | Focused on Shopify product-content cleanup rather than replacing a full SEO, site-speed, or general AI toolkit. | Specializes in image alt text across Shopify and other ecommerce and content platforms. |
| Best fit | Shopify teams that want missing-alt-text detection, selected content drafts, review, publishing, and generation history in one place. | Teams that primarily need automated alt text across many image locations or multiple platforms. |
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 generation credits. Confirm current plan details on the Shopify App Store.
Not in every use case. Teams that primarily need automated alt text across many image locations or multiple platforms. Lumi is the stronger fit when alt text is one part of a Shopify-only process that also includes selected product-description and SEO drafts, review, publishing, generation history, and completed alt-text records.
AltText.ai's primary job is to automatically generate alt text for ecommerce images using image and product context. Lumi is organized around finding missing image alt text, choosing other product fields to refresh, reviewing drafts, publishing approved updates, and keeping generation history.
Your main requirement is dedicated alt-text automation. You need the same alt-text service across platforms beyond Shopify. You want automatic background handling for newly added images.
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
Get a bounded report from Shopify storefront pages, review the findings, and decide whether you need content suggestions, technical SEO, or a repeatable catalog cleanup process.
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