TL;DR — which one should you pick?
Pick ShelfCopy if…
Your store is English-first and you want SEO-tight outputs — schema markup, meta tags at the right character lengths, image alt-text on every image, and a strict diff-preview workflow so nothing publishes until you approve it.
Pick Smartli if…
Your storefront serves multiple languages and translation is a primary workflow alongside AI-written product descriptions.
What each app focuses on
ShelfCopy
ShelfCopy was built around four outputs that ship together on every generation: a 120-200 word product description, a meta title hard-capped at 60 characters, a meta description hard-capped at 155, descriptive image alt-text, and valid schema.org/Product JSON-LD pushed to a Shopify metafield. The Product schema renders rich results in Google — price, availability, brand, and reviews — through a single theme snippet that works across every product page.
The workflow is deliberately strict: every generation is staged as a draft and shown in a side-by-side diff preview against the live product. Nothing writes back to your store until you click Apply. The same rule holds in bulk mode — drafts queue up across 100, 500, or 2,000 products and you review them in a single screen before any of them publish.
Smartli
Smartli is best known among Shopify merchants for AI product descriptions combined with multi-language translation. If you sell into multiple regions and need translated product pages alongside English, Smartli's translation-first approach is the more direct fit.
Feature comparison
| Feature | ShelfCopy | Smartli |
|---|---|---|
| AI product descriptions | Yes — 120-200 word HTML | Yes |
| Meta titles & descriptions | Yes — hard-capped at 60 / 155 chars | Yes |
| Image alt-text | Yes — every image, 8-12 words | Yes |
| Product JSON-LD schema | Yes — pushed to metafield, theme snippet renders rich results | Varies |
| Diff preview before publish | Yes — always, every change | Varies by workflow |
| Bulk generation | Yes — 100, 500, or 2,000 products in background | Yes |
| Brand voice tuning | Yes — Growth tier and up | Yes |
| Multi-language generation | English only at launch (roadmap) | Yes — primary focus |
| Billing | Shopify Billing API — same invoice as your Shopify plan | Shopify Billing API |
| Free trial | 7 days on all tiers | Varies by tier |
| Starting price | $19/mo (Starter, 100 generations) | Check current App Store listing |
Smartli's specifics may change — verify against their current Shopify App Store listing before deciding.
When ShelfCopy is the better fit
You want product schema, not just text. A lot of AI product description apps stop at the description field. ShelfCopy treats Product JSON-LD as a first-class output and pushes it to a metafield on every generation, so your theme can render rich results without any developer work.
You don't trust AI to write directly to your live store. Diff preview is the entire workflow, not an optional toggle. Every change — single or bulk — is staged as a draft and rendered side-by-side against the live product. You can audit 500 products in one screen and reject the ones that miss the mark.
Your store is English-first. ShelfCopy concentrates the prompt and prompt-tuning on English Shopify pages. Multi-language is on the roadmap but not at launch.
When Smartli is the better fit
If your storefront already serves multiple languages and translation is part of your weekly workflow, Smartli is built around that case. ShelfCopy will get there, but if you need it today, pick the app that has it today.
Frequently asked questions
What is the main difference between ShelfCopy and Smartli?
Does ShelfCopy support multiple languages?
Which app is better for SEO?
Can I try both apps before deciding?
Try ShelfCopy free for 7 days.
One-click install from the Shopify App Store. Cancel anytime from your Shopify admin.
Install ShelfCopy