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For solo newsletter writers

See what really happened after you hit send.

Nearly half your opens can be fake. TrueOpen filters out Apple's tracking noise and shows the real number.

Sample Campaign Audit
Reported open rate73%
Real engagement
40%

45% of opens flagged as Apple proxy pre-fetches — 30-subscriber list

Upload a campaign report

Export a CSV from Substack, Buttondown, Mailchimp, Kit, or any other ESP.

Drag a CSV here, or browse files

One file at a time · .csv only

How It Works

THREE STEPS · ENTIRELY IN YOUR BROWSER
01

Upload your CSV

Export a campaign report from any ESP — Substack, Mailchimp, Buttondown, Kit, and more.

02

We flag MPP noise

Fast opens, timestamp clusters, and Apple IP ranges (17.0.0.0/8) are marked as likely pre-fetches.

03

See real engagement

Your Adjusted Engagement Score, true click rate, and at-risk subscriber list — ready to download.

AUTO

TrueOpen auto-detects columns for email, open time, click time, and IP address. You get two numbers side by side: your raw Open Rate and an Adjusted Engagement Score that discounts flagged noise and weights real clicks more heavily. A one-click CSV export of at-risk subscribers rounds it out.