AI Speed: Site Speed Optimizer vs Thunder Page Speed Optimizer
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 8, 2026 for AI Speed, Nov 6, 2026 for Thunder Page Speed Optimizer.
The short answer
- On the Shopify App Store: AI Speed 4.9 from 33 reviews and Thunder Page Speed Optimizer 4.9 from 89 reviews.
- Only Thunder Page Speed Optimizer lists a free plan. Paid plans start at $19.97/month for AI Speed and $19.99/month for Thunder Page Speed Optimizer.
- Thunder Page Speed Optimizer lists 7 features AI Speed’s listing doesn’t mention, including Analytics, Audits, Image compression.
Head to head
Increase Conversions & SEO by making your store Faster!
- United States
- India
- Australia
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Starter
- · 5 pages monitored
- · 500 image optimizations / mo
- · App analysis + image optimizer
- · Automatic safe speed fixes
- · Deep fixes — preview & 1-click revert
- · Email support
Growth
- · 2,000 image optimizations / mo
- · 25 pages monitored
- · AI Assistant grounded in your store data
- · Bulk AI alt-text
- · Daily scans + real-user monitoring
- · Priority support
Pro
- · 100 pages monitored
- · 5,000 image optimizations / mo
- · Advanced AI deep audits
- · Continuous monitoring + auto-revert
- · Proven-impact ROI ledger (real traffic)
- · Slack support
Scale
- · 20,000 image optimizations / mo
- · Bulk vision QA across entire catalog
- · Dedicated success manager + priority SLA
- · Priority AI queue your job process first
- · Unlimited pages + multi-store
- · White-glove onboarding
Free Plan
- · Basic Optimizations
- · Email Support
Advanced
- · Auto-optimize on theme updates
- · Critical CSS
- · Daily Lighthouse score tracking
- · Defer JS, CSS & 3rd-party apps scripts
- · Lazy-load offscreen images
- · Predictive Link Preloading
Visitor Insights
- · 500K visitor pageviews included
- · Actionable fix suggestions
- · All optimizations included
- · Core Web Vitals from your real visitors
- · Core Web Vitals: LCP, CLS, INP
- · Page-by-page Core Web Vitals breakdown
AI Agent
- · Automatically fix theme issues
- · Automatically optimize Core Web Vitals
- · Detect regressions within hours
- · Includes Performance Insights
- · Powered by Claude Opus & GPT-5.6
- · Priority Hands-On Support
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureSlow pages quietly cost you sales and search rankings. AI Speed fixes the causes automatically: it analyzes your store, optimizes theme templates on a safe copy, compresses images to modern formats with AI-written alt text, defers heavy scripts, and improves Core Web Vitals (LCP, INP, CLS). Your design, layout, and functionality never change.
Keep your store speed fast, easy to discover, and ready for AI / LLMs. Thunder continuously monitors how real shoppers experience every page and proactively optimizes slow pages, images, CSS, navigation, and third-party scripts. It identifies delayed clicks, layout shifts, broken links, and hard-to-crawl content, then prioritizes what needs attention.
- Image Optimization: AI-driven optimization for lighter, yet high-quality images.
- Lazy Load: AI-boosted load speed, ensuring a swift and smooth user experience.
- Defer: Intelligent loading, courtesy of AI, streamlines site functionality.
- App Analytics: Precise AI analysis identifies and rectifies performance issues.
- Massively speed your store up. Boost SEO score. Lower CPMs.
- Fix apps and themes that slow down your store speed score.
- Faster websites = Less frustrated customers = More Sales
- Instant "Above The Fold" loading + Predictive preloading webpage technology
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 |  AI Speed |  Thunder Page Speed Optimizer |
|---|---|---|
| Detected stores | 30 | Not published |
| Net store change, 28 days | −4 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Health & Beauty, Apparel & Accessories, Home & Garden | Not published |
| Top store countries | United States, India, Australia | Not published |
Reviews
| Measure | AI Speed | Thunder Page Speed Optimizer |
|---|---|---|
| App Store rating | 4.9 ★ | 4.9 ★ |
| App Store reviews | 33 | 89(ahead) |
| New reviews, 28 days | 0 | 7(ahead) |
| Reviewers a year or more in | Not enough data | 0% |
Pricing
| Measure | AI Speed | Thunder Page Speed Optimizer |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $19.97/month(ahead) | $19.99/month |
| Longest free trial | 14 days | 7 days |
| Plans listed | 4 | 4 |
Listing
| Measure | AI Speed | Thunder Page Speed Optimizer |
|---|---|---|
| Shopify category rank | #160 | #54(ahead) |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | Yes | No |
| Launched | Sep 30, 2019 | May 27, 2022 |
| Languages | 1 | 1 |
| Developer | Arctic Grey | Enigma Apps |
FAQ
AI Speed and Thunder Page Speed Optimizer: common questions
- Is AI Speed or Thunder Page Speed Optimizer cheaper?
- Only Thunder Page Speed Optimizer lists a free plan. Paid plans start at $19.97/month for AI Speed and $19.99/month for Thunder Page Speed Optimizer. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, AI Speed or Thunder Page Speed Optimizer?
- On the Shopify App Store: AI Speed 4.9 from 33 reviews and Thunder Page Speed Optimizer 4.9 from 89 reviews.
- What features does each app list that the other doesn’t?
- Thunder Page Speed Optimizer lists 7 the others don’t mention, such as Analytics, Audits, Image compression, Mobile responsive. 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 Nov 8, 2026 for AI Speed, Nov 6, 2026 for Thunder Page Speed Optimizer; 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 Nov 8, 2026 for AI Speed, Nov 6, 2026 for Thunder Page Speed Optimizer. 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.