Most email trackers were built for Gmail first, and their Outlook support varies more than their marketing suggests. Some cover classic Outlook for Windows but not new Outlook. One works only in Outlook on the web and new Outlook. One free option tracks opens but not clicks.
We checked seven trackers with an Outlook add-in against their own help pages, pricing pages and Microsoft Marketplace listings in September 2026: which versions of Outlook each covers, what it tracks, how it handles opens made by machines, and what it costs. We make Outsolvi, and it's ranked first. Everything said here about the others comes from their own pages, so you can check it.
Outsolvi is our pick for Windows and Microsoft 365 teams who need to know which opens were people: a desktop add-in covers classic Outlook, a web add-in covers Outlook on the web and new Outlook, and every open is graded. Yesware is the mature alternative, and it also filters bot opens. HubSpot has the widest Outlook coverage, including Mac. Mailsuite is free but tracks opens only. Mailbutler suits teams with Apple Mail users, Boomerang is for scheduling, and Cirrus Insight is for Salesforce teams.
How we ranked these tools
Included: tools with an Outlook add-in that tracks the email you send. Checked in September 2026 on each vendor's help pages, pricing pages and Microsoft Marketplace listing. Ranked on which versions of Outlook it covers (classic for Windows, the web, new Outlook, Mac), what it tracks (opens, clicks, attachments), whether it separates machine opens from people, and price per user billed yearly. Prices are the vendors' listed rates in US dollars and they change, so check before you buy. Outsolvi is our product.
We make Outsolvi, and it's on this list. Every tool here, ours included, was scored on the criteria above, so weigh the ranking knowing who wrote it.
Which Outlook each one tracks in
| Tool | Classic Outlook (Windows) | New Outlook (Windows) | Outlook on the web | Outlook for Mac | Machine opens |
|---|
| Outsolvi | Yes, 64-bit Outlook 2016 or later | Yes, Microsoft 365 work or school accounts | Yes, Microsoft 365 work or school accounts | Not yet | Graded; Apple Mail and scanner opens shown but not counted |
|---|
| Yesware | Yes, Outlook 2016 or later | Not stated | Yes, in Chrome or Edge | Legacy Outlook only | Says it filters opens from proxies and security devices |
|---|
| HubSpot Sales Hub | Yes, version 1603 or later | Yes | Yes | Yes, version 15.33 or later | Says it creates no events from bot activity |
|---|
| Mailsuite (Mailtrack) | Yes (desktop app) | Not stated | Yes | Yes (desktop app) | Skips emails you send to yourself; no bot filter described |
|---|
| Mailbutler | Yes, version 2403 or later | Yes | Yes | New Outlook yes; classic with limits | Blocks your own opens; no bot filter stated |
|---|
| Boomerang | Yes, Outlook 2013 or later | Not stated | Yes | Yes | Says it can't tell automated views from people |
|---|
| Cirrus Insight | Yes, Outlook 2013 and 2016 | Not stated | Yes | Yes, Outlook 2016 for Mac | No filter stated; lists causes of false opens |
|---|
From each vendor's own help and pricing pages, checked on 5 October 2026. "Not stated" means the vendor's docs don't name that version, not that it can't work. The Outsolvi row is from our own product.