The two types of Shopify waitlist tools
Before comparing, it helps to understand what problem each type solves:
- Back-in-stock apps (e.g. Back In Stock, Restock Rocket, Klaviyo alerts): A customer finds a sold-out product variant, enters their email, and gets notified when it restocks. These are inventory notification tools. They're reactive — they capture demand that already exists.
- Drop / pre-launch apps (EZDrop): A merchant creates a time-gated release for a new product. Customers sign up before launch, refer friends to move up the queue, and receive launch emails when the drop goes live. These are demand generation tools — they create urgency and build a list before the product exists in the store.
The question isn't which is "better" — it's which matches your use case.
Head-to-head comparison
| Feature | EZDrop | Back-in-stock apps | Manual email list |
|---|---|---|---|
| Built for product drops | ✓ | ✗ | ✗ |
| Viral referral queue | ✓ (Robinhood-style) | ✗ | ✗ |
| Countdown timer on storefront | ✓ (Theme App Extension) | ✗ | ✗ |
| Automated launch email | ✓ | ✓ (restock alert) | Manual |
| Position-based queue | ✓ (scored by time + referrals) | FCFS only | ✗ |
| Works before product exists in Shopify | ✓ | Requires existing product | ✓ |
| Handles multiple concurrent drops | ✓ (Growth+) | ✓ | Complex |
| Free plan | ✓ (1 drop, 500 entries) | ✓ (most have free tier) | ✓ (free if you own the list) |
| Processes payments / holds deposits | ✗ (purchase via normal checkout) | ✗ | ✗ |
What makes EZDrop different: the referral queue
Most back-in-stock apps notify customers in the order they signed up — first come, first served. EZDrop uses a scored queue. Every signup gets a unique referral link. When someone shares that link and a friend signs up through it, the referrer gains +50 position points. Enough referrals can jump a person hundreds of spots in a large waitlist.
This matters because it turns passive signups into active recruiters. The person who signed up yesterday has a reason to share on Instagram, send it to friends, or post in a Discord — because it directly benefits their position. You get distribution from your waitlist rather than just a list of names.
When to use a back-in-stock app instead
Back-in-stock apps are the right choice when:
- You have a product that sells out regularly from existing inventory (e.g., a popular size that runs out)
- You want to capture the demand of customers who arrive at a sold-out product page
- You need per-variant notification (notify me when size M is back, not size L)
- You're not planning a launch event — just managing restocks
EZDrop doesn't do per-variant restock alerts. It's a launch tool, not an inventory management tool.
When to use EZDrop
EZDrop is the right choice when:
- You're launching a new product and want to build demand before it's available
- You want to limit a release — intentional scarcity, not just sold-out inventory
- You want customers to share the launch for you (referral growth loop)
- You want a countdown + live entry count on your storefront to build FOMO
- You want to validate demand before committing to inventory or production runs
Can you use both?
Yes, and many merchants do. Use a back-in-stock app for your catalog of existing products. Use EZDrop when you have a new drop to launch. They solve different problems and don't conflict — EZDrop is a launch event tool, back-in-stock is a catalog management tool.
Launch your next drop with a viral waitlist
EZDrop sets up in under 10 minutes. Free for 1 active drop with 500 entries — no credit card required.
Install EZDrop free →Free plan · Shopify App Store · Setup in 10 min