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MergeGuard

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Customer lists and cleanup for Shopify

Know which customers to win back, reward and offer to next.

MergeGuard is a Shopify app that counts each customer once across all their profiles. It builds your win-back, VIP, subscription and next-offer lists, merges duplicate profiles when you confirm or switch on automatic merging, and suggests fixes for mistyped emails.

Install freeExplore by goal

Nothing merges until you confirm, or until you switch on automatic merging for strong matches or groups that need your judgment. Merges are permanent.

  • Free plan with 25 merges, one time
  • Runs inside your Shopify admin
  • MergeGuard never messages your customers

Demo store (Northsail Supply)

From profiles to people, in the demo store. Counted by profile: Profile A, 4 orders; Profile B, 3 orders; Profile C, 2 orders; ines.moreau@gmial.com; Same person, subscribed twice; 905 look like they stopped ordering; 18 VIPs on single profiles; A subscriber buying their subscription product separately. Shopify counts profiles. MergeGuard counts people. Counted as people: Win back, 842, really stopped ordering; Reward VIPs, 27, VIPs counted as people; Plan your next offer, Close to VIP, Buys in bulk, Buys on sale every time; Subscribers who may cancel, 21, show signs, of 38 with a second account; Cleaner contacts, 926, people from 1,012 contacts; One history, 9 orders, on one customer, Verified by Shopify. Simulated example. Nothing touches a store.

Counted by profile

  • Profile A · 4 orders
  • Profile B · 3 orders
  • Profile C · 2 orders
  • ines.moreau@gmial.com
  • Same person, subscribed twice
  • 905 look like they stopped ordering
  • 18 VIPs on single profiles
  • A subscriber buying their subscription product separately

Shopify counts profiles. MergeGuard counts people.

Counted as people

Take a list out of the app
  • Export a CSV · from Starter
  • Sync to Klaviyo · from Growth
You send the campaign. MergeGuard never messages your customers.

Pick a goal. See the customers behind it.

Four goals, one list of features each. Open a goal to try its demo and see every feature that serves it.

Goal

They ordered last week. Their old profile didn't.

Find the customers who really stopped ordering, and the subscribers showing signs they may cancel.

Demo store (Northsail Supply)

Stopped orderingFrom Scale

Count by

  • A. Hughes (profile C)

    last order 2 May

    Ordered 30 Sep on profile B

    On the listOff the list

  • I. Moreau (profile C)

    last order 11 Feb

    Ordered 8 Oct on profile D

    On the listOff the list

  • T. Bennett (profile A)

    last order 1 Jun

    Ordered 12 Sep on profile B

    On the listOff the list

  • R. Whitaker (one profile)

    last order 14 Mar

    Really stopped ordering

    On the listStays on the list

By profile: 4 look inactive. As people: 1 really stopped.

In the demo store, 905 look inactive by profile, 842 really stopped, and 63 are still buying under another profile.

Subscribers who may cancelFrom Scale

Each dot is about 3 subscribers in the demo store.

38 of 412 subscribers have a second account, and 21 of them show signs they may cancel.

Spot subscribers who may cancel, such as those buying their subscription product separately or skipping and delaying deliveries.

In the app

  • Demo store (Northsail Supply)

    A customer who looks lapsed on one profile is still buying on another.
    Full app screen
    The win-back page in the demo store. Shopify's count of customers who look like they stopped ordering sits beside MergeGuard's smaller count, with buttons to sync to Klaviyo or export the list, and the line that MergeGuard never messages your customers.

    Screens from the MergeGuard app on a demo store. Your numbers will differ.

Features in this goal

Your best customer might look like three ordinary ones.

See your best customers as people, and find the customers for your next offer by how they buy.

Demo store (Northsail Supply)

Amelia Hughes

Your VIP threshold

  • Profile A£412
  • Profile B£268
  • Profile C£141

Each profile alone sits under the threshold.

£821as one person:VIP

VIPs on single profiles
18
VIPs as people
27

18 VIPs on single profiles are 27 VIPs as people.

Plan your next offer

MergeGuard builds the lists. You write the offer.

Close to VIPFrom Growth

Customers who spent a little under your VIP amount, and ordered in the last 12 months.

How they shopFrom Scale

  • Uses discounts on several profilesRegular customers who used discounts on two or more profiles.
  • Buys on sale every timeEvery order had a discount or a marked-down price.
  • Buys in bulkTheir orders hold at least twice as many items as your average.

Features in this goal

Two contacts, one person. One typo, one subscriber you cannot reach.

Find subscribers who would get your email twice, fix mistyped addresses, then sync a list to Klaviyo or export it.

Demo store (Northsail Supply)

Contact fixes

MergeGuard flags mistyped and throwaway emails. A mistyped one gets a suggested correction. When the corrected address already belongs to another customer, MergeGuard offers no fix. The row goes under Matches another customer, with Merge in Duplicates as the action. Throwaway addresses are flagged and never changed.

Automatic fixes cover domain typos only. Everything else waits for your review. Automatic fixes start on Scale.

Ines Moreau. Simulation: nothing touches a store.

  1. Entered address

    ines.moreau@gmial.com

  2. Suggested correction

    ines.moreau@gmail.com

    Common typo of gmail.com

  3. Approved result

    ines.moreau@gmail.com

    Fixed. Still subscribed.

  • A fix doesn't change the customer's subscription.
  • Merges can't be undone; a contact fix can, once.

emails fixed in one pass
24
subscribers reachable again
9

Each dot is about 8 contacts in the demo store.

Newsletter cleanupFrom Starter

1,012 subscribed contacts are 926 people.

86 people would have received your newsletter twice.

Find the subscribed contacts that belong to the same person, the ones who get your newsletter twice. You remove the extras in your email platform, because MergeGuard never unsubscribes anyone.

In the app

  • Demo store (Northsail Supply)

    A mistyped email with its suggested correction, ready to review.
    Full app screen
    The Contact fixes page in the demo store. A mistyped email is shown with its suggested correction, with buttons to check the fixes first or fix the suggested emails, a line saying subscribers are now reachable, and a notice that the fixes are completed with an Undo button.

    Screens from the MergeGuard app on a demo store. Your numbers will differ.

  • Demo store (Northsail Supply)

    One person with two subscribed profiles, counted once.
    Full app screen
    The Audiences page in the demo store, on Newsletter cleanup. Shopify's count of subscribed contacts sits beside MergeGuard's smaller count of people, with one person shown across two profiles, and a button to review the duplicate contacts.

    Screens from the MergeGuard app on a demo store. Your numbers will differ.

Features in this goal

Shopify merges two profiles you already know about. MergeGuard finds the groups.

Find duplicate customers, see why they match, and merge them with Shopify's verification in History.

Try a merge

Review the queue the way you would in the app: look at the evidence, choose the details to keep, then decide.

This is a demo. Your choices are simulated and nothing touches a store.

Demo store (Northsail Supply)

Queue
View
Show

Demo sample: 4 groups you can open.

Amelia Hughes
StrongStrong match3 profiles

Same email, phone and address on all three profiles.

Why we think it's one person

4 of 4 details match or are similar

  • NameSimilar on all 3
  • EmailSame on all 3MergeGuard ignores dots and +tags in Gmail addresses, so these match.
  • PhoneSame on all 3The same number, written two ways.
  • Address14 Elm Row, EdinburghSame on all 3
Choose the details to keep

Your merge rule is a preference: MergeGuard recommends a profile to keep from the profiles that have the details it asks for, and considers every profile when none has them. You choose every detail of the merged customer in the review before you confirm.

AAmelia HughesRecommended

Customer since 2023 · 4 orders

First name
Email
Phone
Orders
4
Spend
£412
Last order
14 Aug 2026
Email marketing
Subscribed
SMS marketing
Subscribed
BAmelia Hughes

Customer since 2025 · 3 orders

First name
Email
Phone
Orders
3
Spend
£268
Last order
30 Sep 2026
Email marketing
Not subscribed
SMS marketing
Not subscribed
CA. Hughes

Customer since 2024 · 2 orders

First name
Email
Phone
Orders
2
Spend
£141
Last order
2 May 2026
Email marketing
Not subscribed
SMS marketing
Not subscribed
2 details match on every profile
Last name
Hughes
Default address
14 Elm Row, Edinburgh
After merging
AHAmelia Hughes
Email
amelia.hughes@gmail.com
Phone
+44 7700 900412
Default address
14 Elm Row, Edinburgh
Orders and spend
9 orders · £821
Removed by Shopify
2 profiles

Subscribed. At least one profile is subscribed, so the merged customer is too.

Uses 2 merges · 25 available

Strong matches merge in one pass, or automatically if you switch that on.

Merge 3 profiles into one customer?

This can't be undone.

3 profiles → 1 customer

Kept
·
Combined
Orders, tags and notes
Removed
2 duplicate profiles, removed by Shopify
Merges used
2 merges · 23 left afterwards

Each merge is recorded in History. In this demo nothing touches a store.

Inès Moreau
Needs your judgmentSome details differ4 profiles

Four different emails, one address and the same phone on three.

Why we think it's one person

3 of 4 details match or are similar

  • NameSimilar on all 4
  • Email4 different
  • PhoneA, B and C match · missing on D
  • AddressSame on all 430 Harbour Wynd, on all 4.
Choose the details to keep

Your merge rule is a preference: MergeGuard recommends a profile to keep from the profiles that have the details it asks for, and considers every profile when none has them. You choose every detail of the merged customer in the review before you confirm.

AInès MoreauRecommended

Customer since 2025 · 4 orders

First name
Last name
Email
Phone
Default address
Orders
4
Spend
£356
Last order
21 Jul 2026
Email marketing
Subscribed
SMS marketing
Subscribed
BInes Moreau

Customer since 2025 · 2 orders

First name
Last name
Email
Phone
Default address
Orders
2
Spend
£164
Last order
3 Sep 2026
Email marketing
Not subscribed
SMS marketing
Not subscribed
CI. Moreau

Customer since 2025 · 2 orders

First name
Last name
Email
Phone
Default address
Orders
2
Spend
£98
Last order
11 Feb 2026
Email marketing
Not subscribed
SMS marketing
Not subscribed
DInès M.

Customer since 2025 · 5 orders

First name
Last name
Email
PhoneNot provided
Default address
Orders
5
Spend
£512
Last order
8 Oct 2026
Email marketing
Not subscribed
SMS marketing
Not subscribed
After merging
IMInès Moreau
Email
ines.moreau@gmail.com
Phone
+44 7700 900118
Default address
30 Harbour Wynd, EH6 6QT, Edinburgh
Orders and spend
13 orders · £1,130
Removed by Shopify
3 profiles

Subscribed. At least one profile is subscribed, so the merged customer is too.

Uses 3 merges · 25 available

Some details differ, so MergeGuard asks. You can still pick single fields to keep.

Merge 4 profiles into one customer?

This can't be undone.

4 profiles → 1 customer

Kept
·
Combined
Orders, tags and notes
Removed
3 duplicate profiles, removed by Shopify
Merges used
3 merges · 22 left afterwards

Each merge is recorded in History. In this demo nothing touches a store.

Sam and Ada Okafor
Needs your judgmentShared address2 profiles

Different names, emails and phones, but the same address.

Why we think it's one person

1 of 4 details match

  • Name2 different
  • Email2 different
  • Phone2 different
  • Address8 Leith Walk, EH6 5AA, EdinburghSame on all 2
Choose the details to keep

Your merge rule is a preference: MergeGuard recommends a profile to keep from the profiles that have the details it asks for, and considers every profile when none has them. You choose every detail of the merged customer in the review before you confirm.

ASam Okafor

Customer since 2024 · 3 orders

First name
Email
Phone
Orders
3
Spend
£204
Last order
9 Apr 2026
BAda OkaforRecommended

Customer since 2023 · 5 orders

First name
Email
Phone
Orders
5
Spend
£498
Last order
17 Sep 2026
4 details match on every profile
Last name
Okafor
Default address
8 Leith Walk, EH6 5AA, Edinburgh
Email marketing
Subscribed
SMS marketing
Subscribed
After merging
AOAda Okafor
Email
ada.okafor@gmail.com
Phone
+44 7700 900861
Default address
8 Leith Walk, EH6 5AA, Edinburgh
Orders and spend
8 orders · £702
Removed by Shopify
1 profile

Subscribed. At least one profile is subscribed, so the merged customer is too.

Uses 1 merge · 25 available

People who live together share an address, so look closely before you merge.

Merge 2 profiles into one customer?

This can't be undone.

2 profiles → 1 customer

Kept
·
Combined
Orders, tags and notes
Removed
1 duplicate profile, removed by Shopify
Merges used
1 merge · 24 left afterwards

Each merge is recorded in History. In this demo nothing touches a store.

Tom Bennett
ProtectedProtected2 profiles

Shopify won't merge these two profiles.

Why we think it's one person

3 of 4 details match or are similar

  • NameSimilar on all 2May be a nickname.
  • Email2 different
  • Phone+44 7700 900254Same on all 2
  • Address3 Canal Wharf, LeedsSame on all 2
Profile details
ATom Bennett

Customer since 2022 · 6 orders

First nameTom
Emailtom.bennett@gmail.com
Orders
6
Spend
£654
Last order
1 Jun 2026
Email marketing
Subscribed
BThomas Bennett

Customer since 2024 · 4 orders

First nameThomas
Emailtbennett@outlook.com
Orders
4
Spend
£362
Last order
12 Sep 2026
Email marketing
Not subscribed
4 details match on every profile
Last name
Bennett
Phone
+44 7700 900254
Default address
3 Canal Wharf, Leeds
SMS marketing
Not subscribed
Why Shopify won't merge these profiles

Profile B: Either of the customer profiles has, or has ever had, a subscription contract.

VIPs on profiles Shopify can't merge. Their profiles stay separate. Their spend still counts together.

MergeGuard can't bypass Shopify's rules and never merges a protected group automatically. The app offers Not a duplicate and no Merge.

Mark this group as not a duplicate?

It leaves your list. You can restore it from Marked not a duplicate.

Reason (optional)

Features in this goal

Count people, not profiles.

Every list above is built from people, so a customer with three profiles counts once.

Demo store (Northsail Supply)

  • Win-back

    By profile
    905
    look like they stopped ordering
    As people
    842
    really stopped

    63 still buy under another profile.

  • VIP

    By profile
    18
    VIPs on single profiles
    As people
    27
    VIPs as people

  • Newsletter

    By profile
    1,012
    subscribed contacts
    As people
    926
    people

    86 would get your newsletter twice.

  • Subscription

    subscribers have a second account
    38 of 412

    21 of them show signs they may cancel.

These are demo store counts. They show how the count changes when each person counts once.

How does MergeGuard know two profiles are one person? It shows you the evidence, then you decide.See the evidence in Try a merge

You decide how much runs without you.

Automatic merging is off until you switch it on. Every merge is recorded in History, with Shopify's verification.

Automatic merging

Demo settings

A demo of the two settings. Nothing here changes a store. Automatic merging comes with Growth and above.

Automatic work stops before your allowance runs out. Groups with the tags you list wait for your review.

Demo store (Northsail Supply)

Demo groups

  • Amelia HughesStrong match, 3 profilesWaits for review
  • Inès MoreauSome details differ, 4 profilesWaits for review
  • Sam and Ada OkaforShared address, 2 profilesWaits for review
  • Tom BennettProtected, 2 profilesProtected

Nothing merges without you. Every group waits for your confirmation.

Protected profiles are never merged automatically.

What stays in your hands

Merges are permanent
MergeGuard saves a snapshot of each merged customer, and History records every merge.
Automation only where you allow it
Automatic merging stays off until you switch it on. Protected profiles are never merged automatically.
Marketing subscriptions follow the person
If any merged profile is subscribed to email or SMS marketing, the merged customer is subscribed, as in Shopify's own merge.
Lists change nothing until you act
Audiences never unsubscribe or delete anyone, and syncing never changes consent.
Contact fixes wait for your approval
You approve each fix, apart from domain typos if you switch on automatic fixes.
Your customers hear nothing from us
MergeGuard never messages your customers.
Install freeRead how MergeGuard keeps merges safeHow automatic merging works

It keeps working after the first clean-up.

Do I need MergeGuard if Shopify can merge?

If you have a handful of duplicates you can name, Shopify's own merge may be enough. It is included with Shopify and merges two profiles at a time. MergeGuard adds duplicate finding across the store, the evidence for each group, merges of a whole group with one confirmation, and lists that count people.

MergeGuard vs Shopify's built-in merge

Start with 25 free merges

Paid plans start at $29 a month, and Starter, Growth and Scale start with a 14-day free trial.

  • Free

    $0

    Merges:
    25, one time
    Contact fixes:
    5, one time
    Install free

  • Starter

    $29a month

    Yearly:Was $348 for 12 months billed monthly$299 a yearAlmost 2 months free

    Merges:
    150 a month
    Contact fixes:
    30 a month

    14-day free trial

    Install free

  • Growth

    Recommended

    $49a month

    Yearly:Was $588 for 12 months billed monthly$499 a yearAlmost 2 months free

    Merges:
    300 a month
    Contact fixes:
    60 a month

    14-day free trial

    Install free

  • Scale

    $99a month

    Yearly:Was $1,188 for 12 months billed monthly$999 a yearAlmost 2 months free

    Merges:
    500 a month
    Contact fixes:
    100 a month

    14-day free trial

    Install free

  • Enterprise

    Contact us

    Merges:
    Custom
    Contact fixes:
    Everything in Scale, or more
    Contact us

Which plan has which feature

FeatureFreeStarterGrowthScaleEnterprise
Newsletter cleanupNot includedIncludedIncludedIncludedIncluded
VIP listsNot includedNot includedIncludedIncludedIncluded
Win-back listsNot includedNot includedNot includedIncludedIncluded
Subscribers who may cancelNot includedNot includedNot includedIncludedIncluded
Audience list exportsNot includedIncludedIncludedIncludedIncluded
Klaviyo sync and profile mergingNot includedNot includedIncludedIncludedIncluded
Keep in syncNot includedNot includedNot includedIncludedIncluded
Merge rulesNot includedNot includedIncludedIncludedIncluded
Automatic contact fixesNot includedNot includedNot includedIncludedIncluded
Automatic mergingNot includedNot includedIncludedIncludedIncluded

Finding duplicates, Protected profiles and History work on every plan.

One merge removes one duplicate profile. Merging a group of 5 profiles into one customer uses 4 merges. Billed through Shopify; renews automatically; change or cancel in Shopify.

Compare plans

Merges are permanent.

Questions merchants ask first

Does MergeGuard send campaigns or message my customers?

No. MergeGuard builds lists and never messages your customers. You send campaigns from your email platform. Shopify's help page says the customer isn't notified when their profiles merge.

Does it recommend products or predict who will cancel?

No. MergeGuard builds lists from how customers buy. The Subscription list in Audiences shows signs, such as buying their subscription product separately or skipping deliveries. What you offer, and to whom, is your decision.

Which plans include which Audiences?

Newsletter starts on Starter, VIP on Growth, and Win-back and Subscription on Scale. Enterprise includes everything in Scale, or more. A plan that doesn't include an audience still shows its counts.

Can a merge be undone?

No. Shopify merges are permanent. MergeGuard shows the evidence and the details the merged customer keeps before you confirm, saves a snapshot of each merged customer, and records every merge in History. History is a record of the change. It doesn't reverse a merge.

Does it work with Klaviyo?

Yes. MergeGuard syncs a list to Klaviyo only when you choose, and connecting Klaviyo never starts a sync on its own. On Growth, Scale and Enterprise you can also turn on Klaviyo profile merging, so the matching Klaviyo profiles merge after MergeGuard merges customers in Shopify. Klaviyo decides the merged profile's consent and suppression, and a Klaviyo merge can't be undone.

What happens to marketing subscriptions when profiles merge?

If any of the merged profiles is subscribed to email or SMS marketing, the merged customer stays subscribed, the same as in Shopify's own merge. That's why every merge starts with evidence and your decision: your confirmation, or automatic merging you switched on for strong matches or groups that need your judgment.

Can MergeGuard merge customers that Shopify blocks?

No. MergeGuard merges through Shopify, so Shopify's rules apply. Groups Shopify won't merge show as protected profiles, with the Shopify blocker for each profile.

Do I need MergeGuard if Shopify can already merge?

If you have a handful of duplicates you can name, Shopify's own merge may be enough. MergeGuard adds duplicate finding across the store, the evidence for each group, group merges and lists that count people.

Every order on one customer.

Install MergeGuard for Shopify free and see which duplicate groups your store has. The Free plan includes 25 merges, one time. Nothing merges until you confirm, or until you switch on automatic merging for strong matches or groups that need your judgment. Merges are permanent.

Install freeContact support

Demo store (Northsail Supply)

Last updated