For the salespeople, freelancers and recruiters who follow up for a living
Unseal tells you the minute your email is opened — every email, for free.
Double-check marks in your Gmail Sent list, and a notification the moment it’s opened, with the time on it. Unlimited tracked emails on the free plan. The price is one small line under your signature — “Sent with Unseal” — and $39 a year turns it off.
One thing up front: this build ships in demo mode — opens are simulated on your device until you add your own pixel server URL in Settings.
Unseal marks it the second it goes.
Now you wait for the second check.
Too soon and you’re a pest. Too late and you’re forgotten.
Guessing is the whole problem.
Sam
The second check turns blue. Not a feeling — a timestamp.
You see the open.
She sees three small words.
Two blue checks.
Unseal’s whole report,
and the only one you need.
Gray checks still waiting. Blue pairs opened, with the time.
The open was eight minutes old.
That was the whole edge.
Every follow-up lives inside an interval.
The salesperson with a proposal out. The freelancer with an invoice pending. The recruiter waiting on a candidate — and the candidate waiting on the recruiter. Until a mark turns blue, every one of them is guessing at the same thing: whether anyone has read it yet.
Nudge an email nobody has opened and you’re noise. Let a proposal sit already-read for two days and the reply you get is the one that starts “sorry for the delay — we went with someone else.” The gap between opened and answered is where the work is decided, and without a timestamp you are working it blind.
Unseal ends the guessing. When a tracked email is opened, a notification arrives with the time — 2:41 PM, not a hunch. Your Sent list shows one gray check for delivered and two blue checks for opened, beside every tracked message. Open the Unseal popup and click any row for that email’s full open timeline. You follow up when there is something to follow up on.
It loads into Chrome from chrome://extensions in under a minute and works inside the Gmail you already have open. No account, no card, no monthly ration — the free plan’s whole price is a one-line signature, and $39 a year retires even that.
emails rationed on the free plan. Track every send, every month.
Free trackers all run the same trade: unlimited sends, paid for with one line of their branding under your signature. Unseal runs it too — “Sent with Unseal,” three words, and a feed that keeps a week. The difference is the exit price. Mailtrack charges $6.99 a month to take its line off; cloudHQ, $69 a year. Unseal’s eraser is $39 a year, and it brings the rest of Pro with it.
Read receipts where you already work: your Sent list.
Unseal’s two blue checks: Ana opened the proposal at 2:41 PM.
One gray check means she hasn’t — so you skip the awkward “just bumping this” to someone who never saw the first one. The marks live in the Sent list you already scan, not in another dashboard.
Unseal keeps each open, with its time — a full timeline, per email.
Open the Unseal popup and click any row for that email’s open timeline. A useful habit: work your follow-ups in open order, not send order. Three opens beats one, one beats a single gray check, and Unseal stamps every one of them with a time — so the list sorts itself. The free feed holds a week of these; Pro holds them all.
Unseal’s tracking switch sits right beside Send, one email at a time.
One click turns it off for personal mail — nothing is tracked and nothing is added without the blue dot. And there is no counter ticking down beside it: the free plan has no monthly cap to watch.
What Unseal can tell you — and what it can’t.
A tracker you rely on for timing should be straight with you about setup, accuracy, privacy and limits. Here is all of it, starting with the part most pages leave out.
Demo mode is on until you add an endpoint
Out of the box Unseal runs in demo mode. Your sends are recorded on this device and an open is simulated a minute or two later, so you can watch the pill, the blue checks, the notification and the activity feed work end to end without a server. Nothing is being measured yet.
For real opens, put your own pixel server’s URL in Settings → Open detection → Tracking endpoint. Unseal then embeds a 1×1 image in every tracked email and your server logs the request. This build ships the extension, not the server.
How opens are detected — and where it slips
Opens are detected with an invisible image. Some inboxes preload images and some block them — Apple Mail Privacy Protection, Gmail’s own image proxy, many corporate gateways. Preloading can report an open nobody made; blocking can hide one that happened. So treat an open as a strong signal, not proof.
Any tracker promising certainty is selling its confidence, not your recipient’s behavior.
Sent-list marks are matched to rows by subject line, so two live threads with an identical subject can end up sharing one mark. Rename the second thread and they separate again.
Gmail’s page structure is unversioned and changes without notice. Everything Unseal injects is feature-detected and fails quietly, so if Gmail shifts, the pill and the marks simply stop appearing until the extension catches up. Your mail is never touched either way.
What Unseal can see
Three permissions: storage, alarms, notifications — and access to mail.google.com only, nowhere else on the web.
Your activity and settings stay in local storage on your device. Nothing leaves your browser unless you point Unseal at your own tracking endpoint in Settings.
What the free plan costs you
Two things, both in the open. Each free tracked email ends with one added line under your signature — “Sent with Unseal” — and the activity feed keeps the last 7 days of opens. Pro removes the line and keeps the full history.
Neither limit touches an email you chose not to track: click the pill off and Unseal adds nothing, records nothing. And Pro isn’t open yet — free, signature and all, is the whole product today.
Three steps, about a minute, no account to create.
Load it into Chrome
Unseal isn’t in the Chrome Web Store yet, so you load it by hand: open chrome://extensions, turn on Developer mode, click Load unpacked and pick the 04-email-tracker folder. It asks for three permissions — storage, alarms, notifications — plus access to mail.google.com and nowhere else on the web. No signup, no email address to hand over, no card.
Open Gmail and compose
A rounded Tracking pill appears next to Send. Leave it on for the emails that matter; click it off for the ones that don’t — an untracked email carries nothing at all.
Watch the Sent list
One gray check the moment it goes. A second check turns blue when it’s opened, and a notification arrives with the time. Open the Unseal popup and click any row for that email’s full open timeline.
Get the folder: download unseal.zip, unzip it, and pick the unzipped 04-email-tracker folder in step 1.
Want to see the activity feed populated before you send anything real? The popup’s empty state has a Load sample activity button. Nothing about the sample touches your mail.
Opens are simulated on your device until you add an endpoint. Settings → Open detection → Tracking endpoint takes your own pixel server’s URL; the extension does the rest. Everything else on this page — the pill, the marks, the notification, the feed — works from the moment it loads.
Free tracks every email. Pro takes our name off it.
- Unlimited tracked emails — no monthly cap
- Double-check marks in your Sent list
- Notification on first open — simulated in demo mode, real once you add an endpoint
- Per-email open timeline, 7 days of history
- One added line under your signature: “Sent with Unseal”
Out of the box, opens are simulated on your device so you can see the whole product work. Real opens need your own pixel server URL in Settings — one field, no account.
Add to Chrome — Free- No signature line — your email ends at your name
- Full activity history, past the free week
- Link-click tracking
- Send later
- Follow-up reminders
- Daily activity report
Pro’s checkout isn’t built yet, so nothing on this page can charge you. $4.99 a month — or $39 a year — is what it will cost when it opens; the extension will tell you inside the popup on the day it does.
Add to Chrome — FreeAbout the signature, plainly. Unlimited tracking costs money to run, and one small line under your signature is how the free plan pays for itself. That is the whole trade.
If that line ever bothers you — and for a proposal to a big client, it might — removing it is the one thing this category verifiably charges for. Mailtrack’s remover is $6.99 a month; cloudHQ’s is $69 a year. Unseal’s is $39 a year, or $4.99 month to month, and link clicks, send later, reminders and full history come along with it.
The proposal you send this afternoon can tell you the minute she opens it.
Free for every email you send — no monthly cap, no card, no account. Works inside the Gmail you already have open.
Add to Chrome — FreeLoads unpacked from chrome://extensions in about a minute — no Web Store listing yet, no account, no card. Opens are simulated until you add your own endpoint. Free emails sign off with one “Sent with Unseal” line; tracking switches off per email, any time.