Know which products are losing you money

Shopify keeps a single cost per item. Change it, and the old value is gone: every margin you calculated before is quietly wrong. CostSonar keeps that history and tells you what is selling below cost.

• Below-cost alert. See every variant you sell for less than it costs you, sorted by the biggest loss per unit.
• Cost history Shopify does not keep. Every cost change is recorded with a date, so past margins stay honest.
• Missing costs, surfaced. Products with no cost set are invisible in every profit report. We list them.

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