Side-by-side comparison · 24 data points
Sell preorders & backorders with full/partial payments. Auto send back-in-stock & coming soon alerts
| Klaviyo | Preorder, Back In Stock REZ | |
|---|---|---|
| Tagline | ||
| Description | ||
| Screenshots | images | images |
| Languages | ||
| Platforms | ||
| Developer |
| Metric | Klaviyo: Email Marketing & SMS | Preorder, Back In Stock REZ |
|---|---|---|
| Rating | 4.7 ★ | ★ 5.0 ★ |
| Total reviews | ★ 3.3k | 1.5k |
| Free plan | Yes | Yes |
| Pricing | Free to install | Free plan available |
| Built for Shopify | — | ★ Yes |
| Pricing tiers | 3 tiers | ★ 4 tiers |
| Listed features | 5 | 5 |
| Featured placements | ★ 4 | 2 |
| Review velocity (30d) | 105 new | — |
| Languages | 10 supported | 24 supported |
| Listed since | Sep 2012 | May 2025 |
Preorder, Back In Stock REZ edges out Klaviyo: Email Marketing & SMS on rating (5.0★ vs 4.7★), but the gap is small enough that pricing fit and feature differentiation should drive the decision more than the headline number.
Pricing entry tiers: Klaviyo: Email Marketing & SMS at Free to install, Preorder, Back In Stock REZ 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.
Klaviyo: Email Marketing & SMS has the larger user base (3,292 reviews vs 1,533), which usually maps to broader integration coverage, faster bug-fix cadence, and a deeper bench of community workflow patterns. Preorder, Back In Stock REZ's smaller cohort can be an advantage for niche workflows where the bigger app has accumulated bloat.
Recommended by size: small/early-stage merchants who need fast install and low risk should default to Preorder, Back In Stock REZ; mid-market and enterprise merchants with specific feature requirements should evaluate both — Klaviyo: Email Marketing & SMS's 3,292-review base may include the workflow context that matches your specific use case better than Preorder, Back In Stock REZ'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: Klaviyo: Email Marketing & SMS audit • Preorder, Back In Stock REZ audit
| Listed |
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| Last updated | — | — |
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| Keyword | Klaviyo | Preorder, Back In Stock REZ |
|---|---|---|
| sales | #24 | #163 |
| forms | #113 | #93 |
| form | #129 | #98 |
| #1 | #238 |
| Signal | Klaviyo | Preorder, Back In Stock REZ |
|---|---|---|
| Average rating | 4.7 ★ (3.3k) | 5.0 ★ (1.5k) |
| Rating distribution | 592% 42% 30% 21% 16% | 5— 4— 3— 2— 1— |
| Reviews · last 7 days | +27 | — |
| Reviews · last 30 days | +105 | — |
| Reviews · last 90 days | +345 | — |
Both Klaviyo: Email Marketing & SMS and Preorder, Back In Stock REZ offer paid plans only. Klaviyo: Email Marketing & SMS starts at Free to install; Preorder, Back In Stock REZ starts at Free plan available. Compare the per-tier features in the Pricing section above before committing.
Preorder, Back In Stock REZ has the higher average rating (5.0★ from 1,533 reviews) compared to Klaviyo: Email Marketing & SMS (4.7★ from 3,292 reviews). Both are tracked daily by AppRanks, so the figures here update each refresh cycle.
Preorder, Back In Stock REZ holds the higher average rating (5.0★ vs 4.7★). 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. Klaviyo: Email Marketing & SMS has the deeper published review base (3,292 vs 1,533), 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.
Klaviyo: Email Marketing & SMS typically suits early-stage and growth-mode teams based on its published review base (3,292 reviews). Preorder, Back In Stock REZ typically suits early-stage and growth-mode teams based on its published review base (1,533 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.
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Migration support varies by app and category. Klaviyo: Email Marketing & SMS and Preorder, Back In Stock REZ 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 Preorder, Back In Stock REZ" in each app's help center. AppRanks does not track migration tooling directly — this is a category-specific capability worth verifying before commitment.
