Microsoft 365 add-in
Track on send, open the task pane for KPIs and Remind Me, upgrade in the web app.
Flexus Email Tracker
Track opens and link clicks from the inbox you already use — Outlook or Gmail. Same Flexus account, reminders, schedule send, and billing.
No credit card · Microsoft or Google sign-in · Free forever with watermark after trial
Email tracking that lives in your inbox
No new mail client. Flexus attaches tracking when you send, then shows contact thread analytics, CTR, and activity — in Outlook and Gmail.
Open alerts
Get a desktop notification in Chrome (Gmail) or Web Push in the app when a tracked message is opened or a link is clicked — so you can follow up while you’re top of mind.
alex@acme.com · Proposal follow-up · 2m ago
Gmail Chrome extension
The Flexus toolbar sits next to Gmail’s Send button. One click registers the send, injects open tracking, rewrites links for CTR, and optionally schedules or reminds you to follow up.
Outlook add-in
Open a sent message in Outlook and the Flexus task pane shows opens, clicks, CTR%, message history, and a timeline — matching the analytics you get in Gmail’s side panel.
Contact thread
Whether you’re in Outlook or Gmail, Flexus aggregates every tracked send to a contact — so you see the full conversation health before you follow up.
Two clients · one account
Microsoft sign-in for Outlook. Google sign-in for Gmail. Shared history, reminders, schedule send, and Stripe billing.
Track on send, open the task pane for KPIs and Remind Me, upgrade in the web app.
Track / Remind / Send later on compose, side panel thread analytics, desktop notifications.
Full tracked history, notification prefs, team seats, and Stripe Pro at $2/user/month.
Capabilities
See when emails were opened with device and approximate location signals.
HTTP links rewrite through Flexus so genuine clicks are counted per URL.
Web Push in the app and Chrome notifications in Gmail on open or click.
Follow-up conditions and scheduled sends via Microsoft Graph or Gmail API.
OAuth only. Workspace isolation. Published privacy & terms.
Keep tracking after trial with a small Flexus watermark — upgrade anytime.
Pricing
No credit card for the trial. Same plans for Outlook and Gmail users.
$0 / forever
7 days Pro
$2 / user / mo
FAQ
Sign in with Microsoft or Google, install the Outlook add-in or Gmail extension, and send as usual. Flexus records opens and link clicks. Open a sent item to review the contact thread.
Same job — know when mail is opened and which links get clicked — plus Outlook support, shared web history, reminders, and schedule send on one Flexus account.
No. Customers register only with Microsoft (Outlook) or Google (Gmail) OAuth.
You keep Free tracking with a Flexus watermark, or upgrade to Pro at $2/user/month to remove it.
Modern Outlook (Mailbox 1.12+) and Gmail in Chrome via the MV3 extension. Billing and history live at trackmail.theflexus.com/app.
Gmail/Yahoo proxy opens are labeled. Automated scanners are flagged so they don’t inflate open counts. Clicks are genuine.
Start your 7-day Pro trial with Microsoft or Google. No credit card required.
Start free trial
