Best Email Tracking for Gmail in 2026

Outsolvi is the top pick because it runs natively on Gmail through a Chrome extension AND on Outlook (classic, web and new Outlook) with one shared dashboard, grades every open as a person or a machine, with the reason shown, and includes AI-written follow-ups at the $7 yearly base tier. For Gmail-only teams running sequence-driven outbound at high volume, Mixmax is the premium alternative. For cheapest paid, Mailtrack Pro at $4.99 yearly.

For Gmail, yes. The Outsolvi Gmail extension installs from the Chrome Web Store, and Chrome is the browser it's tested in. Other Chromium browsers such as Edge, Brave or Arc can often install Chrome Web Store extensions, but they aren't tested, so check yours first. There's no Google Workspace add-in yet, so an IT team that blocks third-party Chrome extensions would need to allow this one. Outlook doesn't need Chrome at all: classic Outlook uses the desktop add-in, and Outlook on the web and new Outlook use the web add-in.

Yes. Apple MPP affects any tracking pixel regardless of which mailbox provider hosts the email. A recipient on a Gmail-hosted mailbox reading through Apple Mail with MPP enabled produces the same MPP pre-fetch signature as a Microsoft 365 recipient reading through Apple Mail. Apple Mail accounted for 62 percent of the opens Litmus measured in July 2026. Outsolvi labels these opens Apple Mail and leaves them out of the open count unless the same person clicks or replies. The detailed math is in the [open-rate accuracy piece](/blog/email-open-rate-accuracy).

Since December 2013, Gmail routes every embedded image through Google's image proxy on googleusercontent.com servers. The proxy fetches the tracking pixel when the message is opened, not when it's delivered, so a proxy fetch is usually a real open. The image can be fetched again while the reader keeps the email open or comes back to it, which generates duplicate open events. Outsolvi groups repeat Gmail-proxy fetches within ten minutes into one open, so a single human read does not get counted as multiple opens. If you send from Gmail yourself, a fetch in the first five minutes after sending is labelled as possibly your own Sent folder and not counted. Most tools do not apply this filter.

Chrome extension is the default and has the richer UI surface (custom compose-pane elements, sidebar integrations). Workspace add-in works under stricter IT policies (organisations that disallow third-party Chrome extensions) but has a more constrained UI surface. If your IT team allows Chrome extensions, pick the extension. If they do not, look for a tracker with a Workspace add-in; Outsolvi doesn't have one yet, so it needs the Chrome extension allowed.

Of the seven trackers on this list, only Outsolvi covers classic, web and new Outlook with the same tracking it gives Gmail. The other six are Gmail-only. If there is any chance your team adds Outlook users in the next 12-24 months, picking a Gmail-only tracker now means re-platforming later. Outsolvi removes that constraint by covering both clients from day one with one unified dashboard.