Free Email Tracker for Gmail — Read Receipts & Open Tracking | Kilroy

See when your Gmail messages get opened. Sign in with Google — or connect your own Supabase backend.

Kilroy is a free email tracker for Gmail. See when the emails you send are opened, get read receipts right inside your inbox, and — unlike every other tracker — keep your data yours. WHAT YOU GET • Email open tracking — a ✓✓ and an open count appear on your sent message, inside Gmail • Read receipts for Gmail, with the time of the first open • Link click tracking (optional) — a stronger signal than an open • A dashboard: opens per day, opens by recipient, and every message you track • Honest filtering — security scanners, Apple Mail privacy prefetch, and your own re-reads are detected and set aside, so a "read" means a read • No signature and no "Sent with…" branding on your emails — the tracker is an invisible 1×1 pixel OWN YOUR DATA Most email trackers route every message through their own servers, and your recipient list becomes their asset. Kilroy is open source, and your tracking is scoped to your account and isolated from every other user. Want to hold it entirely yourself? One click points Kilroy at your own database, so nobody — not even us — can read it. Read every line: github.com/RelayLabs-apps/kilroy WHO IT'S FOR Sales and SDRs, recruiters, founders, freelancers, and job seekers — anyone who wants to know their email landed, without a monthly fee or handing their contacts to a third party. HONEST BY DESIGN An "open" is an image being fetched, which is not always a person reading. Kilroy tells you what each number can and can't support instead of inventing a city and a device. No geolocation theatre, no fake precision. Open tracking sits in a genuine grey area, and tracking recipients in some jurisdictions may require their consent — Kilroy makes it easy to turn off per message, from the chip beside Send. Free. No credit card. Sign in with Google and you're tracking.