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1. Listing metadata
Field-level data| Retainful | XFlow Back in Stock Alert | |
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| Screenshots | images | images |
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| Listed |
| Retainful | XFlow Back in Stock Alert | |
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| Tagline | ||
| Description | ||
| Screenshots | images | images |
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| Listed |
Automate back in stock alerts and send unlimited emails with personalization to recover lost sales
| Metric | Retainful Email Marketing, SMS | XFlow Back in Stock Alert |
|---|---|---|
| Rating | 4.4 ★ | ★ 5.0 ★ |
| Total reviews | 28 | ★ 60 |
| Free plan | Yes | Yes |
| Pricing | Free plan available | Free plan available |
| Built for Shopify | — | ★ Yes |
| Pricing tiers | 2 tiers | ★ 3 tiers |
| Listed features | 5 | 5 |
| Featured placements | — | 1 |
| Languages | 1 supported | 5 supported |
| Listed since | Apr 2020 | Dec 2025 |
Based on the data on this page, XFlow Back in Stock Alert is the stronger choice for most Shopify App Store merchants — 5.0★ vs Retainful Email Marketing, SMS's 4.4★ is a meaningful gap that usually reflects real product or support quality differences across the user base.
Pricing entry tiers: Retainful Email Marketing, SMS at Free plan available, XFlow Back in Stock Alert 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 XFlow Back in Stock Alert; mid-market and enterprise merchants with specific feature requirements should evaluate both — Retainful Email Marketing, SMS's 28-review base may include the workflow context that matches your specific use case better than XFlow Back in Stock Alert'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: Retainful Email Marketing, SMS audit • XFlow Back in Stock Alert audit
| Last updated | — | — |
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| Keyword | Retainful | XFlow Back in Stock Alert |
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| send unlimited | Not ranked | #2 |
| lost | Not ranked | #3 |
| back in stock alerts | Not ranked | #5 |
Not featured in any section recently.
No tracked changes.
Both Retainful Email Marketing, SMS and XFlow Back in Stock Alert offer paid plans only. Retainful Email Marketing, SMS starts at Free plan available; XFlow Back in Stock Alert starts at Free plan available. Compare the per-tier features in the Pricing section above before committing.
XFlow Back in Stock Alert has the higher average rating (5.0★ from 60 reviews) compared to Retainful Email Marketing, SMS (4.4★ from 28 reviews). Both are tracked daily by AppRanks, so the figures here update each refresh cycle.
XFlow Back in Stock Alert holds the higher average rating (5.0★ vs 4.4★). That is the one dimension AppRanks can separate them on here — read both apps' detail pages for the feature breakdown and recent listing changes.
Both apps are one-click installs from the Shopify App Store. XFlow Back in Stock Alert has the deeper published review base (60 vs 28), 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.
Retainful Email Marketing, SMS typically suits early-stage and growth-mode teams based on its published review base (28 reviews). XFlow Back in Stock Alert typically suits early-stage and growth-mode teams based on its published review base (60 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. Retainful Email Marketing, SMS and XFlow Back in Stock Alert 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 Retainful Email Marketing, SMS" in each app's help center. AppRanks does not track migration tooling directly — this is a category-specific capability worth verifying before commitment.
