ShelfCopy ‑ AI Descriptions+SE vs SitePx SEO OS
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026.
The short answer
- Only SitePx SEO OS lists a free plan. Paid plans start at $19/month for ShelfCopy and $29/month for SitePx SEO OS.
- SitePx SEO OS lists 49 features ShelfCopy’s listing doesn’t mention, including AI generation, ALT text, Analytics.
Head to head
Starter
- · 100 generations per month
- · Descriptions and meta tags
- · Image alt-text
- · Product JSON-LD schema
Growth
- · 500 generations per month
- · Brand voice tuning
- · Bulk mode for full catalog
- · Everything in Starter
Scale
- · 2,000 generations per month
- · Everything in Growth
- · Multi-store support
- · Priority handling
Free
- · Blog AI generation (English)
- · Delayed job processing
- · Guided fix recommendations
- · Image alt text generation
- · Product AI generation (English)
- · SEO audits (up to 20 entities)
Pro
- · Multiple languages enabled
- · No job queue delays
- · SEO audits (up to 500 pages)
- · Schema deploy + validator
- · Search Console integration
- · Sitemap controls enabled
Growth
- · Full schema suite + validator
- · Larger bulk batches (up to 1,000)
- · No job queue delays
- · Premium image models (Growth)
- · SEO audits (up to 2,000 pages)
- · Scheduled automations
Enterprise
- · All premium image models
- · Full schema suite + validator
- · Priority job queue
- · Priority support
- · Scheduled automations
- · Search Console insights
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureShelfCopy generates SEO-optimized product descriptions, meta titles, meta descriptions, image alt-text, and Product JSON-LD schema for any product in your catalog. Every generation goes through a side-by-side diff preview before anything publishes — you stay in control. Bulk mode targets only the products that need it: missing meta tags, empty alt-text, or your full active catalog.
SitePx SEO OS helps merchants improve organic visibility by auditing products, blogs, pages, and images, then prioritizing issues with clear fix actions. It can generate and optimize titles, descriptions, tags, and alt text in your chosen brand voice, and deploy structured data with validation checks. Background jobs run updates safely, with status tracking and change history for review and revert.
- Generate descriptions, meta tags, alt-text, and Product schema in one click
- Side-by-side diff preview before any change is written to your store
- Bulk mode targets products missing meta tags or empty image alt-text
- Choose from 5 brand voices and a target audience to tune output
- SEO audits across products, blogs, pages, and images with clear priorities
- One-click fixes for titles, descriptions, tags, and image alt text
- Structured data (schema) deployment with built-in validation checks
- Performance and accessibility checks with actionable recommendations
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  ShelfCopy |  SitePx SEO OS |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | ShelfCopy | SitePx SEO OS |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | ShelfCopy | SitePx SEO OS |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $19/month(ahead) | $29/month |
| Longest free trial | 7 days | Not listed |
| Plans listed | 3 | 4 |
Listing
| Measure | ShelfCopy | SitePx SEO OS |
|---|---|---|
| Shopify category rank | Not enough data | #797 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | May 12, 2026 | Jun 17, 2026 |
| Languages | 1 | 10 |
| Developer | Phase Logic LLC | themefox.com |
FAQ
ShelfCopy and SitePx SEO OS: common questions
- Is ShelfCopy or SitePx SEO OS cheaper?
- Only SitePx SEO OS lists a free plan. Paid plans start at $19/month for ShelfCopy and $29/month for SitePx SEO OS. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- SitePx SEO OS lists 49 the others don’t mention, such as AI generation, ALT text, Analytics, APIs and webhooks. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 14, 2026; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 14, 2026. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.