Side-by-side comparison · 24 data points
Smart inventory management with real-time alerts, automation, & analytics for zero stock-out issues.
| Out Of Stock Alert Restock Lab | RMS Preorder & Back in Stock | |
|---|---|---|
| Tagline | ||
| Description | ||
| Screenshots | images | images |
| Languages | ||
| Platforms | ||
| Developer | ||
| Listed | ||
| Last updated | — | — |
Every "sold out" becomes a sale you didn't lose.
| Metric | Out Of Stock Alert Restock Lab | RMS Preorder & Back in Stock |
|---|---|---|
| Rating | 5.0 ★ | — |
| Total reviews | 31 | 0 |
| Free plan | Yes | Yes |
| Pricing | Free | Free plan available |
| Built for Shopify | — | — |
| Pricing tiers | 1 tier | ★ 4 tiers |
| Listed features | 5 | 5 |
| Languages | 1 supported | 1 supported |
| Listed since | Feb 2026 | Feb 2026 |
Based on the data on this page, Out Of Stock Alert Restock Lab is the stronger choice for most Shopify App Store merchants — 5.0★ vs RMS Preorder & Back in Stock's 0.0★ is a meaningful gap that usually reflects real product or support quality differences across the user base.
Pricing entry tiers: Out Of Stock Alert Restock Lab at Free, RMS Preorder & Back in Stock at Free plan available. 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.
Recommended by size: small/early-stage merchants who need fast install and low risk should default to Out Of Stock Alert Restock Lab; mid-market and enterprise merchants with specific feature requirements should evaluate both — RMS Preorder & Back in Stock's 0-review base may include the workflow context that matches your specific use case better than Out Of Stock Alert Restock Lab's broader-but-shallower coverage.
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: Out Of Stock Alert Restock Lab audit • RMS Preorder & Back in Stock audit
| Keyword | Out Of Stock Alert Restock Lab | RMS Preorder & Back in Stock |
|---|---|---|
| inventory planning | #15 | Not ranked |
| inventory optimization | #17 | Not ranked |
| inventory forecasting | #18 | Not ranked |
No tracked changes.
Both Out Of Stock Alert Restock Lab and RMS Preorder & Back in Stock offer paid plans only. Out Of Stock Alert Restock Lab starts at Free; RMS Preorder & Back in Stock starts at Free plan available. Compare the per-tier features in the Pricing section above before committing.
AppRanks cannot separate these two on rating, because neither publishes one. Out Of Stock Alert Restock Lab does carry the larger published review base (31 vs 0). Read both apps' detail pages for the feature breakdown and recent listing changes.
Both apps are one-click installs from the Shopify App Store. Out Of Stock Alert Restock Lab has the deeper published review base (31 vs 0), 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.
Out Of Stock Alert Restock Lab typically suits early-stage and growth-mode teams based on its published review base (31 reviews). RMS Preorder & Back in Stock typically suits early-stage and growth-mode teams based on its published review base (0 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. Out Of Stock Alert Restock Lab and RMS Preorder & Back in Stock 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 RMS Preorder & Back in Stock" in each app's help center. AppRanks does not track migration tooling directly — this is a category-specific capability worth verifying before commitment.
