Side-by-side comparison · 24 data points
Grow sales with pre-order, backorder. Add out of stock waitlists with 'notify me' & restock alerts.
| Preorder, Back in stock Duck | Alarmify ‑ Inventory Alarm | |
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| Description | ||
| Screenshots | images | images |
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Recover lost sales by automatically notifying customers when products are back in stock.
| Metric | Preorder, Back in stock Duck | Alarmify ‑ Inventory Alarm |
|---|---|---|
| Rating | 5.0 ★ | 5.0 ★ |
| Total reviews | ★ 512 | 2 |
| Free plan | Yes | Yes |
| Pricing | Free plan available | Free to install |
| Built for Shopify | ★ Yes | — |
| Pricing tiers | 4 tiers | 4 tiers |
| Listed features | 5 | 5 |
| Featured placements | 2 | — |
| Languages | 1 supported | 3 supported |
| Listed since | Mar 2023 | Apr 2025 |
Preorder, Back in stock Duck and Alarmify ‑ Inventory Alarm are evenly matched on rating (5.0★ vs 5.0★) — the differentiator comes down to pricing fit, feature breadth, and which app's interaction pattern suits your team's workflow.
Pricing entry tiers: Preorder, Back in stock Duck at Free plan available, Alarmify ‑ Inventory Alarm at Free to install. Check each app's tier structure for the capacity limits you actually need before deciding — the headline number is the same shape, but the gating shape per tier (seats, usage volume, integrations) varies.
Preorder, Back in stock Duck has the larger user base (512 reviews vs 2), which usually maps to broader integration coverage, faster bug-fix cadence, and a deeper bench of community workflow patterns. Alarmify ‑ Inventory Alarm's smaller cohort can be an advantage for niche workflows where the bigger app has accumulated bloat.
Recommended evaluation path: install both apps' free tiers (where available) and run them in parallel on a small cohort for 7-14 days before committing. The data tables below show the per-feature breakdown — for most merchants the deciding factor will be a single integration or workflow detail that's hard to compare from listing pages alone.
This verdict is generated from the live marketplace data on this page — rating, review count, pricing tier, and category position all refresh from the canonical Shopify App Store listing every 24 hours. AppRanks does not accept payment to influence comparison outcomes; the methodology is documented on the About page and applies identically to every pair on the site.
Read each app's audit: Preorder, Back in stock Duck audit • Alarmify ‑ Inventory Alarm audit
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| Keyword | Preorder, Back in stock Duck | Alarmify ‑ Inventory Alarm |
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| sold-out products | #4 | Not ranked |
| notify | #6 | Not ranked |
| preorder | #7 | Not ranked |
Not featured in any section recently.
No tracked changes.
Both Preorder, Back in stock Duck and Alarmify ‑ Inventory Alarm offer paid plans only. Preorder, Back in stock Duck starts at Free plan available; Alarmify ‑ Inventory Alarm starts at Free to install. Compare the per-tier features in the Pricing section above before committing.
Preorder, Back in stock Duck (5.0★, 512 reviews) and Alarmify ‑ Inventory Alarm (5.0★, 2 reviews) are essentially tied on rating. Look at review velocity and individual reviewer quotes — both visible on each app's detail page — to differentiate.
AppRanks cannot separate these two on rating — both sit at 5.0★. Preorder, Back in stock Duck does carry the larger published review base (512 vs 2). Read both apps' detail pages for the feature breakdown and recent listing changes.
Both apps are one-click installs from the Shopify App Store. Preorder, Back in stock Duck has the deeper published review base (512 vs 2), which often — though not always — accompanies better-tested setup docs. AppRanks doesn't measure setup time directly: read the recent reviews on each app's detail page for user-reported install experience.
Preorder, Back in stock Duck typically suits early-stage and growth-mode teams based on its published review base (512 reviews). Alarmify ‑ Inventory Alarm typically suits early-stage and growth-mode teams based on its published review base (2 reviews). A larger review base generally means the app has been exercised at scale — relevant if you are processing high volume or handling enterprise compliance requirements.
Migration support varies by app and category. Preorder, Back in stock Duck and Alarmify ‑ Inventory Alarm both publish their export options on their marketplace listing pages (or in their support docs); some apps offer one-click import from competitors, others require CSV. The fastest check: search "import from Alarmify ‑ Inventory Alarm" in each app's help center. AppRanks does not track migration tooling directly — this is a category-specific capability worth verifying before commitment.
