Privacy policy
Last updated November 13, 2026
Shop Lag collects as little as it can. We keep your email address, the things you save, and what you decide about them. We never sell any of it.
Who we are
Shop Lag is run by Mercantile Commerce LLC ("we", "us"). Questions about this policy or your data can go through our contact form.
What we collect
- Your email address, so you can sign in and get your weekly review email.
- The items you save: each product's link, name, picture, store, and the price you saw when you saved it.
- What happens to each item: whether you bought it, let it go or waited, and when. Your scoreboard is worked out from this.
- Your settings: your review day, your time zone, and whether emails are paused.
- Clicks on Buy links: when you click Buy, we record which item and when, so we can send you to the store and count how often saved items get bought.
- Messages you send us: if you use the contact form, your name (if you give it), email address and message, so we can reply.
- Error reports: if something breaks, technical details about the error so we can fix it.
We don't use advertising trackers, and we keep your list out of analytics tools. A list can say a lot about someone (health, gifts, money), so we treat it as private.
What the browser extension does
When you install the extension, your browser warns that it can read data on the websites you visit. That access is needed to recognize shopping pages. Here's exactly how it's used:
- It checks the address of the page you're on to tell whether it's a store or a checkout page. It doesn't send your browsing history to us.
- It reads the page's content only when you click Save, and only to capture the product's name, picture, price and store.
- It never adds, changes or removes affiliate links, and it never starts a purchase.
How we use it
- To keep your list and show it to you.
- To send your weekly review email on your review day, and sign-in emails when you ask for them.
- To send you to a store when you click Buy.
- To fix problems and keep the service secure.
We don't sell your data, rent it, or use it to show you ads.
Who helps us run Shop Lag
These services process data on our behalf, only to run Shop Lag:
- Clerk: sign-in and account emails. Holds your email address.
- Convex: our database. Holds your list, settings and history.
- Resend: sends the weekly review email.
- Cloudflare: hosts the website.
- Sentry: error reports.
When you click Buy, you go to the store's own site, sometimes through an affiliate network. Once you're there, the store's privacy policy applies. See our affiliate disclosure for how those links work.
How long we keep it
We keep your data while you have an account. When you delete your account, we delete your list, history, settings and your sign-in account. Copies in backups are deleted as those backups expire.
Your choices
- Delete everything from Settings at any time. This can't be undone.
- Pause or stop emails from Settings or the link in any email.
- See or correct your data through our contact form.
Depending on where you live, you may have other rights over your data. Contact us and we'll help.
Children
Shop Lag isn't meant for anyone under 13, and we don't knowingly collect their data.
Changes
If we change this policy, we'll update the date at the top. If a change matters, we'll tell you by email before it takes effect.