ShelfCompass makes small, sharp tools for ecommerce and email teams. Each one works from data you already have — your order history, the campaign in front of you — and turns it into fewer wasted discounts and fewer sends you regret.
MarginGuard is live for early-access stores while the Shopify App Store listing is prepared. Email Link Checker is coming to the Chrome Web Store.
There are enough tools that promise everything and touch every corner of your business. We go the other way. A ShelfCompass tool solves one real problem, works from your own data, and then gets out of your way.
We work from your actual orders, refunds, product costs and the email in front of you — not a vanity score. If your own data doesn't back a claim, the tool doesn't make it: a check we couldn't run says so instead of going green.
Each tool handles a single problem from end to end. You set it up once, it does the work, and you don't have to think about it again.
Our tools read only what they need and change nothing they weren't asked to. They never email your customers, never touch your store on their own, and never send a campaign for you.
Some of the customers on your discount list quietly lose you money: heavy returners, people who only ever buy on a code, orders that cost more than they bring in. MarginGuard finds them from your real order data and builds a "don't discount" list in Klaviyo, so your next promo skips them automatically.
$15 / 30 days or $150 / year · introductory trial for eligible first subscriptions · read-only store data access
Send is the one button you can't take back. This Chrome extension runs deterministic checks on the email already open in Gmail, Mailchimp or Klaviyo: broken and redirecting links, missing UTMs, merge tags that never resolved, forgotten placeholders. A check it couldn't run is reported as unverifiable, never as a green tick.
Free public beta · no account, no payment
MarginGuard reads your last year of orders and shows you, name by name, which repeat customers are worth a discount and which ones aren't. Then it keeps the list current on its own.