NewReplay missed events to Klaviyo
Catch what Klaviyo misses. Replay every event to the right audience.
Shopify x Klaviyo doesn't track up to 70% of abandoned profiles.
We fix that so you make more revenue!
ROI guaranteed.
See who Klaviyo misses
Drag to compare
Klaviyo catches some journeys on its own. MailBoost fills the gap— resolving identity and replaying events so far more profiles reach your flows.
Why you need MailBoost
Without tying storefront and checkout to one identity, Klaviyo can't see the full picture. Here's what that costs you.
Profiles Klaviyo never sees
Visitors who don't match from browse to checkout never get into your flows. Abandoned cart and win-back emails never send.
~15%Abandoned cart flows that don't fire
When session and checkout don't line up, Klaviyo can't tie the cart to a profile. Emails go unsent or to the wrong person.
BrokenDecisions on wrong data
Missing or wrong attribution means you optimize on noise. You scale what looks good and cut what's actually working.
BlindRevenue you could recover
Carts and flows that could convert sit idle. Without reliable identity, that revenue stays on the table.
Every dayStop guessing. Start growing.
MailBoost resolves identity so you see the full picture. Recover abandoned carts, fix your flows, and grow with data you can trust.
ZERO RISK — 100% FREE TO TEST
From invisible to revenue
Klaviyo never sees most abandoners after identity breaks. MailBoost detects who they are, then replays the event so abandonment flows fire again—you earn more from sales you’d otherwise miss.
Invisible to Klaviyo
nina.k***@gmail.com
Cart abandoner
omar.r***@icloud.com
Checkout abandoner
riley.c***@proton.me
Browse abandoner
MailBoost
Waiting…
Unknown
nina.k***@gmail.com
Waiting for this profile…
More money from flows
Waiting…
Extra revenue you keep
$0.00
No extra revenue until a missed profile is detected and replayed.
2 min setup
Connect Shopify and go
No theme edits
App embed + Web Pixel only
See replays fast
Events land in Klaviyo quickly
More flow sends
Abandonment flows reach real profiles
Why choose MailBoost?
We solve the identity and data gaps that hold back Klaviyo and abandoned cart revenue.
Easy integration
- Connect your store in minutes.
- One app embed for the script, one Web Pixel for checkout.
- No theme code or manual editing.
Better tracking in checkout
Same session from storefront to thank-you page. We resolve visitors so Klaviyo gets more accurate data.
More profiles in Klaviyo
Better tracking = Better data = Better targeting & fewer wasted sends.
Make more revenue
Know who actually abandoned, who bought, and who clicked. Run and scale flows on data you can trust.
ZERO RISK — 100% FREE TO TEST
100% GDPR Compliant
Your data is processed according to strict GDPR requirements with complete transparency, ensuring full compliance with European privacy regulations and your customers' rights.
Secure Data Centers
All data is stored in certified, highly secure infrastructure meeting industry standards. We ensure data sovereignty and the highest levels of protection at every layer.
Built in Germany
MailBoost is developed by a German company with developers in Germany—you work with a team that understands European privacy expectations and ships product accordingly.
Data security you can trust
Your data security is our top priority. We ensure complete protection and compliance at every level.
ZERO RISK — 100% FREE TO TEST
Simple tracking in 3 steps
Get from install to live events in minutes.
Track on storefront and checkout
Add our script and pixel via the Shopify app. We capture sessions, carts, and checkout so every step is tied to one identity.
Resolve identity
We match storefront sessions to checkout and order data, then resolve to email or phone so Klaviyo knows exactly who did what.
Recover with Klaviyo
Events flow into Klaviyo. Abandoned cart and other flows fire for the right people so you recover more revenue.
ZERO RISK — 100% FREE TO TEST
Simple, transparent pricing
Choose the plan that fits your revenue.
Startup
< $250k yearly revenue
- All features included
- 30 days full access free.
- Zero risk - ROI guarantee!
- ROI guaranteed or money back
- Klaviyo + Shopify Integration
- Better event tracking
ZERO RISK — 100% FREE TO TEST
Start with zero risk
- Try MailBoost free for 30 days—one full month to run it on your store.
- Test it and see the uplift in your flows—zero risk while you evaluate.
- After that, cancel anytime—no long-term lock-in.
Integrations
Works with the tools you already use.
We all love them—but their tracking doesn't work, leaving you to lose up to 70% in sales. We're here to fix this.
Why this matters
Up to 70% of abandoners
never reach your flows
After iOS privacy changes, Klaviyo often only sees checkout when a shopper is logged in or recently identified. Most anonymous sessions never trigger your abandoned-cart automation — so that revenue looks like it vanished.
First-party, server-side tracking
Checkout and storefront events reach MailBoost even when the browser never fires Klaviyo’s script.
Identity resolution
Match anonymous sessions to profiles you already have so abandonment isn’t invisible.
Automatic Klaviyo sync
Replay the events your flows expect — same metrics, cleaner timelines.
Revenue calculator
How much are you leaving on the table?
Modeled gap vs. what native tracking captures
Monthly
+$13,230
Annually
+$158,760
Email share × typical abandoned-flow mix × ~70% missed by browser-only tracking. Estimate only.
Modeled upside is ~53.1× this plan.
30 days full access free.
Same shopper. Two outcomes.
Watch the journey split when Klaviyo never sees the abandonment, then when MailBoost replays the events so your flow actually runs.
Klaviyo alone
Identity breaks. The flow never starts.
With MailBoost
Events replayed. The email sends.
30 days free on the full product.
Try MailBoost on your real store: we guarantee an uplift in revenue.
Cancel anytime during the trial - your first month is FULLY free.
30 day trial
Your first 30 days are 100% free - no risk!
ROI guarantee
Cancel anytime during the trial. Continue only if MailBoost clearly earns its place in your stack.
Additive to Klaviyo
Your existing flows and segments stay in place. We just COPY and improve the flows.
Free access for 30 days.
Cancel anytime.
ROI guarantee.
30 days free. Cancel anytime.
Frequently asked questions
Everything you need to know about MailBoost.
- Connect your Shopify store and Klaviyo in the dashboard, add our script and pixel via the app embed and Web Pixel—most stores are live in under 15 minutes.
- We tie storefront and checkout identity (sessions, carts, orders) to the same visitor so Klaviyo gets accurate profiles. That means abandoned cart and post-purchase flows reach the right people instead of getting lost in the gap.
- No. Install the Shopify app, enable the theme block and pixel in your store settings, and connect Klaviyo in the MailBoost dashboard. No code or theme editing required.
- We focus on identity resolution and sending reliable events into Klaviyo so your flows and segments work. One script plus one pixel, built to match how Shopify and Klaviyo expect data.
- We store only what's needed to resolve identity and send events to Klaviyo. You control the connection; we don't sell your data. We're designed to work within standard privacy and data-handling practices.
- Yes. You can disconnect Klaviyo and remove the script and pixel from your store whenever you like. No long-term lock-in.
Start recovering more revenue today.
Get every visitor into Klaviyo. Fire the right flows to the right people.
Get started free