Multichannel inventory and shipping for Shopify + Amazon sellers. Every write is logged before it happens. Every conflict is surfaced with evidence. Nothing gets overwritten blind.
A sync event log in which every event is named and timestamped, and a write conflict is rejected, held for review, and resolved, rather than silently overwritten.
Multichannel sellers know the shape of it. An order is edited after it lands, the edit never syncs, and the wrong item ships. Inventory gets quietly rewritten across locations for weeks before anyone can prove which tool did it. A tracking number never makes it back to the store. And the dashboard said everything was fine the whole time.
The failure isn't the bug. Every sync tool fails sometimes. The failure is silence: software that keeps reporting green while it loses your data, and support that can't tell you what happened because the tool didn't record it either.
Nothing touches your inventory without an audited event written first. One pipeline carries the whole chain: inbound change, detected difference, outbound write, receipt. You can read it end to end. When something goes wrong, the log says exactly what, where, and when.
Writes are compare-and-set: if the quantity moved underneath us, the write is refused and held for review with both values shown. Ambiguous SKU matches never auto-link: anything short of an exact match waits for a human click.
Every channel shows a named health state with a reason code and evidence, not a vague status dot. Failures alert you immediately, coalesced so an incident is one email, not forty. And if email delivery itself fails, a persistent banner in the app says so. The notifier is watched too.
Your first sync computes what it would write and holds it for your confirmation. A kill switch stops all outbound writes within one cycle. A circuit breaker halts any run that tries to mutate an abnormal share of your inventory at once, and files a critical alert instead of finishing the job.
Version one does a small number of things and instruments all of them.
Each of those arrives when it can meet the same bar: surfaced, logged, never silent.
Most tools in this category bill by order volume, so your bill climbs in the months you sell most. This one does not. If the price ever changes, you'll hear it from us first, loudly, like everything else.
Syncproof is in development. If you run Shopify plus Amazon and you've been burned by silent sync, we want to build against your setup: email us a sentence about your channels and order volume, and we'll keep you posted as early access opens.