A Chrome extension that tells you when someone opens the email you sent from Gmail, and why each open counted. Free with a Google sign-in, or run it on your own server.
Proposal for the Q1 rollout
| Time | Kind | Via | User agent |
|---|---|---|---|
| 13:02 | Open | Gmail proxy | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246 |
| 11:47 | Open | Gmail proxy | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246 |
| 10:02 | Self view | Gmail proxy | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246 |
| 09:14 | Prefetch | Direct | Mozilla/5.0 |
Maya opened it 2 h 33 min after you sent it. Google's proxy fetched the image for her.
Every tracker counts image loads. Likelyread sets aside your own views and Apple’s prefetches, and shows you why each open counted.
GET /p/7f3c9e2a-41d8-4b6e-9c1a-2e5f8d0b7a43.gif
Open, via Gmail proxy
Counted. Maya’s inbox is Gmail, so the request comes from Google, not from her.
GET /p/7f3c9e2a-41d8-4b6e-9c1a-2e5f8d0b7a43.gif
Prefetch
Not counted. Apple Mail Privacy Protection loads every image when the email arrives, read or not.
GET /p/7f3c9e2a-41d8-4b6e-9c1a-2e5f8d0b7a43.gif
Self view
Not counted. The extension saw you open your own email and told your server first.
GET /p/7f3c9e2a-41d8-4b6e-9c1a-2e5f8d0b7a43.gif
Self view
Not counted, and usually never sent: the extension stops your browser from loading your own pixel.
Switch it on with the eye beside Send. Your own rereads are set aside , Apple’s robot is flagged , and each campaign gets its open rate .
Tracking never blocks or delays a send. If the extension or your server fails, the email goes out as written, untracked, and its registration retries for seven days.
Proposal for the Q1 rollout
Tomaya@harbourline.co
TrackingOn
Pixel added, 43 bytes
First you press Send. The pixel goes in last.
Proposal for the Q1 rollout
Tomaya@, tom@
CampaignQ1 outreach
Registered on your server
Then your server learns it exists.
Proposal for the Q1 rollout
09:14Prefetch
10:02Self view
11:47Open
Then the image loads, more than once.
Proposal for the Q1 rollout
Opens2
Filtered1 self, 1 prefetch
Opened ×2
Last, you read the verdict.
$0
$3 a month, billed $36 yearly
Or $5 monthly. Launch offer: $59 once, for the first 500.
Go Pro$0 on your server
For comparison, Mailtrack's free plan shows only the first open and adds its signature to your emails, and its full history costs $19.99 a month (mailsuite.com, October 2026).
Because an image loading is all any tracker ever sees. Gmail caches, Apple prefetches and forwards travel. Likelyread sorts out the loads it can tell apart, so the opens you see are the ones that count.
It depends where your recipients are. In France, the CNIL’s April 2026 recommendation says tracking opens to measure a campaign needs the recipient’s prior consent, B2B included. Check before you track.
No. Install the extension and sign in with Google. If you would rather keep everything on your own machine, run the server yourself: a small Linux box with Docker (512 MB of memory is plenty) and a subdomain pointed at it.
git clone https://github.com/Hugo-SEQUIER/likelyread.git
cd likelyread/deploy && cp .env.example .env
# set DOMAIN and LIKELYREAD_TOKEN
docker compose up -dOn Likelyread Cloud, on our server in Germany, visible only to you, never sold or shared. You can download or delete all of it from your Account page. Self-hosted, it lives in one SQLite file on your machine and nothing reaches us. The extension has no analytics either way.
No. If the extension or the server fails, the email is sent exactly as written, without the pixel. Gmail’s Send is never blocked or delayed.
You send from Gmail on the web, in Chrome. Your recipients can read in any app that loads images; the Limits section above says what each one reveals.
A hidden image served from a brand-new domain can raise spam scores. Serve it over HTTPS from a domain with some history.
Tracking is free. Pro costs $36 a year or $5 a month and adds campaign analytics and full history. Self-hosting is free with every feature: it is MIT-licensed open source.