Booster SEO & Image Optimizer vs SEO King
Both have free plans on the Shopify App Store. SEO King's free plan does more of the everyday work: unlimited meta title, meta description and alt text updates, and photo renaming. Its paid plans start at $9.99 a month (checked Oct 13, 2026) for 500 pages. Booster's free plan covers alt text and broken-link detection, and its Pro plan, $39 a month (checked Oct 8, 2026), adds meta optimization, autopilot fixes, rich snippets and sitemap submission. Budget decides it: SEO King covers the basics for less, and Booster Pro adds automation and monitoring at a higher price. Both charge through your Shopify bill.
Updated Oct 24, 2026 by Jean Luc.
Side by side
| Booster SEO & Image Optimizer | SEO King | |
|---|---|---|
| Starting price | From $39/mo Billed monthly. Checked Oct 8, 2026. | From $9.99/mo Billed monthly. Checked Oct 13, 2026. |
| Free plan or trial | Free plan | Free plan |
| Works with | Shopify | Shopify |
| Best for | Small Shopify store, Mid-size Shopify store | Small Shopify store |
| Monthly billing | Available | Available |
| Billed | Through Shopify, on your Shopify bill | Through Shopify, on your Shopify bill |
| Store rating | 4.8 on the Shopify App Store, 5,487 ratings, checked Oct 6, 2026 | 4.7 on the Shopify App Store, 543 ratings, checked Oct 13, 2026 |
| Built for Shopify | Yes | Yes |
| Testing | Researched | Researched |
| Last verified | Oct 10, 2026 | Oct 14, 2026 |
Features the developers list
What each developer tags on its Shopify App Store listing, grouped by job. They’re the developers’ claims, not our findings.
| Booster SEO & Image Optimizer | SEO King | |
|---|---|---|
| Meta tags | Listed | Listed |
| Bulk SEO editing | Listed | Listed |
| Structured data | Listed | Listed |
| Image alt text | Listed | Listed |
| Image compression | Listed | Listed |
| Speed optimization | Listed | Listed |
| Sitemaps and indexing | Listed | Listed |
| Broken links and redirects | Listed | Listed |
| SEO audits | Listed | Not listed |
| Keyword research | Listed | Listed |
| Rank tracking | Listed | Not listed |
| Local SEO | Listed | Not listed |
| AI-written content | Listed | Listed |
From the Shopify App Store listings for Booster SEO & Image Optimizer and SEO King, checked Oct 19, 2026.
Plans
Booster SEO & Image Optimizer
- Free: $0
- Pro: $39 a month billed monthly, or $29.08 a month billed yearly
- Premium: $69 a month billed monthly, or $51.58 a month billed yearly
Booster SEO & Image Optimizer pricing, limits and billing terms
SEO King
- Free basics: $0
- 500 Pages: $9.99 a month billed monthly, or $5.83 a month billed yearly
- 5,000 Pages: $13.99 a month billed monthly, or $6.67 a month billed yearly
- 20,000 Pages: $16.99 a month billed monthly, or $8.33 a month billed yearly
Which to choose
Pick Booster SEO & Image Optimizer if
- you want SEO fixes run on autopilot and monitored, which Pro includes.
- you want image compression in the same app: Premium includes it.
Pick SEO King if
- you want to edit meta tags and alt text without paying: the free plan has no limit on either.
- your store is small and you want the lowest paid plan: $9.99 a month for 500 pages.
More on these tools
Sources
- Booster SEO & Image Optimizer: https://apps.shopify.com/booster-apps-seo-optimizer (Oct 6, 2026)
- SEO King: https://apps.shopify.com/seo-king (Oct 9, 2026)
- SEO King: https://engageify.com/ (Oct 6, 2026)
- SEO King: https://seoking.ai/ (Oct 9, 2026)
- SEO King: https://seoking.ai/refund-policy (Oct 9, 2026)
- SEO King: https://apps.shopify.com/seo-king (Oct 13, 2026)
- SEO King: https://seoking.ai/ (Oct 13, 2026)
- SEO King: https://seoking.ai/refund-policy (Oct 13, 2026)
- SEO King: https://engageify.com/ (Oct 13, 2026)