Change a component's price, and the bundle price follows.
What the app does
When you build a bundle with Shopify Bundles, changing a component's
price does not change the bundle's price. Every price
change means fixing the bundle by hand — or selling at an outdated price
without noticing.
Kumiko Bundle Price Sync detects component price changes and
recalculates and updates the bundle price according to the
policy you choose. Each update is recorded in the history and
can be undone one at a time (the history shows the most recent 100
entries; failed updates, updates already undone, and undo operations
themselves cannot be undone).
The default is M4 — notify only. Installing the app
changes nothing. First see which bundles have drifted and by how much,
then switch to automatic updates when you're ready.
Features
Detects component price changes automatically —
applied within 10 / 30 / 60 seconds depending on your
plan (a burst of changes is applied once, using the last value; timing
depends on Shopify's webhook delivery)
Four policies — M1 Match component total / M2 Keep
discount rate / M3 Keep fixed discount / M4 Notify only (no
price changes)
A policy per bundle — plus a store-wide default
(M1 or M4 is recommended as the default. M2 / M3 need a
rate or amount per bundle, so bundles without their own setting stop
with "Missing discount setting")
Drift dashboard — every bundle that is out of sync,
by how much, and the total
Apply now — update one bundle immediately without
waiting for a component change
History and undo — revert a price update (this also
stops auto-sync for that bundle)
Safety threshold — when the change exceeds your
threshold, the app doesn't write the price; it stops and tells you
why
Rounding — round half up, round up, or round
down
English and Japanese — currency and decimal places
follow your store's base currency (0 decimals for JPY)
Requirements and limitations
Shopify's Bundles app is required. This app does not
create bundles; it only keeps the bundle price in step with its
components.
Only prices are updated. Bundle components and
quantities are never changed.
Only the base-currency price is updated. Fixed
prices set directly per market or per company in Markets or B2B price
lists are not changed (prices derived from the base price through
exchange rates or adjustments follow automatically). Stores using fixed
prices see a warning in the app.
Above your plan's bundle limit, only the bundles over the
limit stop syncing; bundles already synced keep working. The
app shows which bundles are affected.
After creating a new bundle, press "Re-scan bundles" in the
app — new bundles are not detected automatically. Changes to an
indexed bundle's components are picked up when the parent product is
updated, but press "Re-scan bundles" to be sure.
Final responsibility for the selling price rests with the store
owner.
Pricing
The Starter plan starts with a 14-day free trial
(once per store). Growth and Pro have no free trial. Plans can be
changed at any time and take effect immediately. Switching to Growth or
Pro during the trial starts billing that day.
Plan
Monthly (USD)
Bundles
Sync speed
History
Starter
$9.99
up to 50
60 s
30 days
Growth (recommended)
$29
up to 300
30 s
180 days
Pro
$79
up to 2,000
10 s
365 days
Bundles are counted as bundle products, not
variants.
Need more than 2,000 bundles? Contact
kumiko.support@gmail.com for a custom plan.
Moving to a plan with shorter history retention deletes entries
older than the new limit from the next retention run (within 24 hours)
onward. Deleted history cannot be restored (this notice is always shown
in the Plan section of Settings).