You hit send. Then your issue lands somewhere.
Primary, Promotions, or spam — Gmail decides quietly, and most writers find out weeks later from a sagging open rate. Newsletter Health Check tells you where every issue landed, the morning it goes out, and raises the alarm the day your placement flips.
No integration. It works the way email works.
Substack has no API. beehiiv and Kit lock their data behind their own dashboards. Newsletter Health Check sidesteps all of it: real inboxes, subscribed like real readers.
Add three subscribers
We give you seed addresses at Gmail, Outlook and Yahoo. You subscribe them to your newsletter like any reader — Substack, beehiiv, Kit, Ghost, anything that sends email.
We open every issue as a reader's inbox sees it
Each seed reports where your issue actually landed: Primary, Promotions, Updates, or the spam folder — per provider, per issue.
You get the report, and the alarm
A placement report for every send, and an email the moment placement changes — so a bad week costs you one issue, not a quarter.
"My newsletter was pushed into the Promotions tab. My open rate plummeted, from 60% to 30%."
A Substack writer, r/Substack — the kind of surprise this product exists to end.
And where do you land on Google?
Substack doesn't tell Google when you publish. Posts can sit out of the index for months while a copy on some aggregator ranks instead. The index report watches your feed, submits every post through Google Search Console, and sends a weekly count of what's actually in the index — and what fell out.
Same waitlist — tick "Google indexing" above if this is the part you need.
This week: 3 new posts submitted, 2 dropped out of the index. Full list in your Monday report.
What we're building, plainly
Newsletter Health Check doesn't exist yet. This page is how we decide to build it: if enough writers want this, we ship — and the people on this list get in first, at the founding price, for as long as they subscribe.
We're Tyn Studio, a one-person studio in Amsterdam. We already run substacktokindle.com, which reads newsletter email all day, every day. This is the same plumbing, pointed at a problem writers keep describing and no one prices for them: the monitoring tools that do this today start at $59 a month and are built for marketing teams.