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1. Listing metadata
Field-level data| FlowRelay | Klaviyo | |
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| Tagline | ||
| Description | ||
| Screenshots | images | images |
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| Developer | ||
| Listed |
| FlowRelay | Klaviyo | |
|---|---|---|
| Tagline | ||
| Description | ||
| Screenshots | images | images |
| Languages | ||
| Platforms | ||
| Developer | ||
| Listed |
| Metric | FlowRelay: Send Email via Flow | Klaviyo: Email Marketing & SMS |
|---|---|---|
| Rating | — | 4.7 ★ |
| Total reviews | 0 | 3k |
| Free plan | Yes | Yes |
| Pricing | Free plan available | Free to install |
| Built for Shopify | — | — |
| Pricing tiers | ★ 4 tiers | 3 tiers |
| Listed features | 5 | 5 |
| Featured placements | — | 4 |
| Review velocity (30d) | — | 126 new |
| Languages | 1 supported | 10 supported |
| Listed since | May 2026 | Sep 2012 |
Based on the data on this page, Klaviyo: Email Marketing & SMS is the stronger choice for most Shopify App Store merchants — 4.7★ vs FlowRelay: Send Email via Flow's 0.0★ is a meaningful gap that usually reflects real product or support quality differences across the user base. Pricing entry tiers: FlowRelay: Send Email via Flow at Free plan available, Klaviyo: Email Marketing & SMS 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 (apps, orders, integrations) varies. Klaviyo: Email Marketing & SMS has the larger user base (2,996 reviews vs 0), which usually maps to broader integration coverage, faster bug-fix cadence, and a deeper bench of community workflow patterns. FlowRelay: Send Email via Flow's smaller cohort can be an advantage for niche workflows where the bigger app has accumulated bloat. Recommended by store size: small/early-stage merchants who need fast install and low risk should default to Klaviyo: Email Marketing & SMS; mid-market and enterprise merchants with specific feature requirements should evaluate both — FlowRelay: Send Email via Flow's 0-review base may include the workflow context that matches your specific use case better than Klaviyo: Email Marketing & SMS'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: FlowRelay: Send Email via Flow audit • Klaviyo: Email Marketing & SMS audit
| Last updated | — | — |
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| Keyword | FlowRelay | Klaviyo |
|---|---|---|
| transactional emails | #4 | #14 |
| flow | #17 | #15 |
| #523 | #2 |
Not featured in any section recently.
No tracked changes.
| Signal | FlowRelay | Klaviyo |
|---|---|---|
| Average rating | 0.0 ★ (0) | 4.7 ★ (3k) |
| Rating distribution | 5— 4— 3— 2— 1— | 590% 42% 30% 21% 17% |
| Reviews · last 7 days | — | +25 |
| Reviews · last 30 days | — | +126 |
| Reviews · last 90 days | — | +458 |
No reviews yet.
Both FlowRelay: Send Email via Flow and Klaviyo: Email Marketing & SMS offer paid plans only. FlowRelay: Send Email via Flow starts at Free plan available; Klaviyo: Email Marketing & SMS starts at Free to install. Compare the per-tier features in the Pricing section above before committing.
It depends on what you're optimizing for. FlowRelay: Send Email via Flow fits better if you prioritize broader integrations; Klaviyo: Email Marketing & SMS is the call if you need the higher-rated option. Read both apps' detail pages on AppRanks for the full feature breakdown, install counts, and recent listing changes.
Both apps are one-click installs from the Shopify App Store marketplace. Klaviyo: Email Marketing & SMS has more onboarding documentation maturity (2,996 reviews vs 0), which usually translates to better-tested setup wizards and quicker time-to-value. AppRanks doesn't measure setup time directly — read the recent reviews on each app's detail page for merchant-reported install experience.
FlowRelay: Send Email via Flow typically suits early-stage and growth-mode stores based on its review-base composition (0 reviews). Klaviyo: Email Marketing & SMS aligns more with early-stage and growth-mode stores (2,996 reviews). Larger review bases generally mean the app has been load-tested at scale — relevant if you're processing high order volume or handling enterprise compliance requirements.
Migration support varies by app and category. FlowRelay: Send Email via Flow and Klaviyo: Email Marketing & SMS 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 FlowRelay: Send Email via Flow" in each app's help center. AppRanks does not track migration tooling directly — this is a category-specific capability worth verifying before commitment.
Good sevice
It's brought me income the first day of activating our pop sign-up form. Which is what you really want from platforms like this! Thank you Klaviyo!
