Double Holo vs Harbour
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026.
The short answer
- Harbour lists 6 features Double Holo’s listing doesn’t mention, including Data import and export, Error reports, Orders.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Starter
- · Basic Market Data
Pro
- · Detailed Market Data
- · Sentiment
Free
- · 1 connected store
- · 3 regions
- · 5 free classifications
Pay as you go
- · Expert human-in-the-loop classifications
- · Export classification reports
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureDouble Holo automatically matches your trading card products to our market database and displays a customizable widget on your storefront. Shoppers see live charts, period highs and lows, and trends. Upgrade to Starter for recent data and grading population breakdowns, or Pro for AI-powered forecasts, market sentiment, and grading ROI analysis.
Harbour AI helps merchants stay compliant with international trade regulations. Connect your Shopify store and Harbour automatically syncs your product catalog, classifies items with the correct tariff codes, and identifies potential compliance risks.
- Real-time charts with historical data for trading cards
- Auto-match your products to our database of 500K+ cards
- Recent sales data and graded population breakdowns
- AI-powered forecasts and market sentiment analysis
- Connect your Shopify store and automatically sync your entire product catalog
- HS/tariff code assignment for your products to ensure correct customs codes
- Monitor your product compliance status at a glance on our dashboard
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 |  Double Holo |  Harbour |
|---|---|---|
| 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 | Double Holo | Harbour |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 9 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Double Holo | Harbour |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $9/month | No monthly plan listed |
| Longest free trial | 7 days | Not listed |
| Plans listed | 2 | 2 |
Listing
| Measure | Double Holo | Harbour |
|---|---|---|
| Shopify category rank | #170 | #127 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | May 1, 2026 | May 13, 2026 |
| Languages | 1 | 1 |
| Developer | Double Holo | Harbour AI |
FAQ
Double Holo and Harbour: common questions
- What features does each app list that the other doesn’t?
- Harbour lists 6 the others don’t mention, such as Data import and export, Error reports, Orders, Product details. 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 13, 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 13, 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.