Inventory Guard · Waitlist

Stop Shopify–Amazon oversells before they hit your cancel rate

One master inventory, per-channel buffers, and a hard block before oversell — built for Shopify + Amazon (± one 3PL) brands under ~$2M GMV. Not another multi-week ERP.

Join Waitlist See how hard-block before oversell works

Market-validation page · Free waitlist · No fake user counts

Problem

Oversells push Cancel Rate risk

Shopify, Amazon, and your 3PL each keep their own stock numbers. At peak, one oversell cancels orders and pushes Amazon Pre-Fulfillment Cancel Rate — over 2.5% risks account health warnings, listing suppression, or suspension.

Before

Shopify / Amazon / 3PL each keep their own stock numbers
Peak oversell → cancels → Cancel Rate climbs
Cin7 too heavy / Zapier unreliable

After

One master inventory + per-channel buffer%
Hard block before oversell; protect account health
Thin App OAuth layer; $49–$149/mo hypothesis band

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Solution

What Inventory Guard does

An SMB thin layer: master inventory, channel buffers, and hard block before oversell — App OAuth, not a multi-week ERP.

WHO

DTC/brand operators or founders at ~USD 100k–2M GMV who expanded from single Shopify to Amazon (FBM/partial FBA) and may use one 3PL.

PROBLEM

Each channel and 3PL keeps its own stock; no single source of truth or channel safety stock — peak oversells drive Cancel Rate risk.

SOLUTION

Master SKU + near-realtime decrement + per-channel buffer% + hard block before oversell + daily reconcile. Shopify App OAuth + Amazon SP-API; aimed at $49–$149/mo.

RESULT

Hard-block before oversells hit Cancel Rate and account health — without Cin7/Linnworks-class ERP or fragile Shopify + Zapier.

Features

Marketing points from the product hypothesis — for demand validation, not a formal spec promise.

📦

Master SKU inventory

Single source of truth across Shopify + Amazon (± 3PL); atomic decrement on order/return webhooks.

🛡️

Per-channel buffer%

Set sellable buffer% per channel; auto 0/reserve at threshold to prevent peak oversells.

🛑

Hard block before oversell

Intercept before oversell writes to channels — lower Pre-Fulfillment Cancel Rate risk, not post-cancel cleanup.

📊

Daily reconcile + oversell events

Daily diff and suspected oversell event list to catch channel drift early.

⚡

SMB install path

Shopify App OAuth first + Amazon SP-API; optional CSV/SFTP 3PL; 90-day scope: two channels + one 3PL file format; $49–$149/mo.

How it works

A three-step loop matching the waitlist-stage product hypothesis.

1
Connect Shopify + Amazon
Shopify App OAuth; Amazon SP-API; optional one 3PL CSV/SFTP format.
2
Set master stock + channel buffers
Define master SKUs and per-channel sellable buffer%; auto 0/reserve at threshold.
3
Hard-block + daily reconcile
Block before oversell; daily diff and suspected oversell events to protect Cancel Rate.

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Use cases

Who it’s for

If these situations sound familiar, join the waitlist to help us validate.

Shopify → Amazon FBM expansion

Single-warehouse numbers don’t match; promos open and you oversell.

Partial FBA + own warehouse / 3PL

Channels need different sellable buffers so one side doesn’t sell out while the other still lists.

Peak / ad-spend weeks

Hard-block before Cancel Rate worsens — not after hiring a POA consultant.

Evaluated Cin7 / Linnworks, walked away

You want an App-thin layer, not a $5k–$30k ERP onboarding.

One 3PL file reconcile

Daily CSV/SFTP alignment to catch Shopify / Amazon / 3PL drift.

Public signals

Public signals from the industry

Public reporting and industry discussion only — not customer testimonials or invented metrics.

FAQ

How is Inventory Guard different from Cin7 / Linnworks / Katana / Brightpearl?

We focus on an SMB thin layer: master inventory, per-channel buffers, and hard block before oversell — App OAuth, not a multi-week ERP. Hypothesis band $49–$149/mo.

How is it different from Shopify Inventory / Stocky / Zapier?

Near-realtime decrement across Amazon, channel buffers, hard block, and daily reconcile — not native multi-location alone or fragile Zapier chains.

What’s in the 90-day validation scope?

Two channels (Shopify + Amazon) plus one 3PL file format (CSV/SFTP).

When is early access?

Waitlist invites go out in batches by email. No fake launch date.

What’s the expected price?

Hypothesis band $49–$149/mo; final pricing arrives with launch email.

Waitlist

Join the waitlist

Leave your email for Inventory Guard early access and launch notes. We will not invent a ship date.