Cassian vs GO4 Monitoring
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for Cassian, Nov 3, 2026 for GO4 Monitoring.
The short answer
- Only Cassian lists a free plan. Paid plans start at $49/month for Cassian and $19/month for GO4 Monitoring.
- Cassian lists 2 features GO4 Monitoring’s listing doesn’t mention, including Custom dashboards, Custom reports.
Head to head
Inspector
- · 1 site, 10 pages monitored
- · AI discoverability checks
- · Core Web Vitals monitoring
- · Critical pricing change alerts
- · Health score with prioritised findings
- · Sitemap and page speed monitoring
Analyst
- · 2 scans per week
- · 500 pages per scan
- · AI product feeds (5K products)
- · Cassian Shield security scans
- · Full content quality analysis
- · Order drop + pricing alerts
Protector
- · 2,000 pages per scan
- · AI product feeds (25K products)
- · Cassian Shield security scans
- · Daily link + sitemap monitoring
- · Daily scans
- · Full Order + Pricing Pulse
Guardian
- · 5,000 pages per scan
- · 90-day screenshot history
- · AI product feeds (100K products)
- · Cassian Shield security scans
- · Daily pricing monitoring
- · Daily scans + uptime (5 min)
Starter
- · 3 alert destinations + 1 GO4 user
- · Automated shopping flows up to 5 steps
- · Monitor up to 50 collections
- · Monitor up to 500 products
- · SEO monitoring for up to 2,000 URLs
- · Self-service monitoring setup
Growth
- · 5 alert destinations + 3 GO4 users
- · Automated shopping flows up to 12 steps
- · Guided monitoring setup included
- · Monitor up to 2,500 products
- · Monitor up to 200 collections
- · SEO monitoring for up to 10,000 URLs
Scale
- · 10 alert destinations + 5 GO4 users
- · Automated shopping flows up to 20 steps
- · Expanded setup & coverage review
- · Monitor up to 10,000 products
- · Monitor up to 500 collections
- · SEO monitoring for up to 50,000 URLs
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCassian connects to your store and watches it continuously, so you hear about problems before your customers do. It monitors your order flow and tells you when orders slow, which is often the first sign that a shipping rules has broken. It tracks every product price and flags zero-dollar, inverted and bulk changes.
GO4 monitors store health and key shopping paths so merchants can find issues that may affect sales, search visibility or customer experience. It combines catalog, SEO, automated browser checks and storefront monitoring in one place.
- One health score that tells you what to fix and what's fine across your store
- Continuous uptime, page speed, and broken link monitoring with weekly digests
- Content and translation quality checks so every page reads well everywhere
- AI product feeds that make your catalog visible to AI shopping assistants
- Monitor store uptime, health and critical shopping paths
- Detect inconsistencies across products, variants and catalog data
- Catch SEO issues across products, collections and sitemap URLs
- Detect when critical storefront app features disappear for shoppers
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 |  Cassian |  GO4 Monitoring |
|---|---|---|
| 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 | Cassian | GO4 Monitoring |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 3 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Cassian | GO4 Monitoring |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $49/month | $19/month(ahead) |
| Longest free trial | 14 days | 14 days |
| Plans listed | 4 | 3 |
Listing
| Measure | Cassian | GO4 Monitoring |
|---|---|---|
| Shopify category rank | #825 | #419(ahead) |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | May 6, 2026 | Sep 7, 2026 |
| Languages | 1 | 2 |
| Developer | Cassian | DIGILAB EOOD |
FAQ
Cassian and GO4 Monitoring: common questions
- Is Cassian or GO4 Monitoring cheaper?
- Only Cassian lists a free plan. Paid plans start at $49/month for Cassian and $19/month for GO4 Monitoring. 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?
- Cassian lists 2 the others don’t mention, such as Custom dashboards, Custom reports. GO4 Monitoring lists 2 the others don’t mention, such as Historical analysis, Notifications. 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 for Cassian, Nov 3, 2026 for GO4 Monitoring; 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 for Cassian, Nov 3, 2026 for GO4 Monitoring. 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.