Ranked List6 tools comparedUpdated May 24, 2026

Best Email Tracking for Outlook in 2026

Microsoft 365 covers the majority of B2B email in 2026, particularly in enterprise and mid-market. The list of trackers that ship a native Office.js add-in covering Outlook Desktop (classic Win32), Outlook on the Web, and New Outlook with feature parity to the Gmail Chrome extension is shorter than the marketing pages suggest. Tools that "support Outlook" through SMTP fallbacks or web-app workarounds do not count; the structural test is a native add-in that runs inside the Outlook compose pane.

This ranking is the six trackers that pass the structural test, ordered by the buyer-deciding factors for Outlook-heavy teams: feature parity between the Outlook and non-Outlook surface, open-tracking accuracy, AI features at base tier, privacy posture, and per-seat math.

TL;DR

For Outlook-heavy AE teams in 2026, Outsolvi is the top pick because it is built Outlook-first with full Office.js parity on Desktop, Web, and New Outlook, exposes Tier 1 to 5 confidence scoring on opens, and includes AI features at the $7 yearly base tier. Yesware and HubSpot Sales Hub are next, but both gate the useful AI to higher tiers and have lighter Outlook commit cadence than their Gmail surfaces. Cirrus Insight is the right pick if Salesforce sync is load-bearing. Mailbutler covers Apple Mail too. Boomerang is the scheduling-first option.

How we ranked these tools

Pass criterion: ships a native Office.js add-in for Outlook Desktop, Web, and New Outlook with feature parity to the tool's primary surface. Ranked on Outlook commit cadence vs the primary surface (25%), open-tracking accuracy (25%), AI included or gated (20%), privacy posture (15%), per-seat yearly price (15%). Pricing is the publicly listed rate in May 2026, billed yearly. The eight Gmail-only competitors are excluded entirely from this ranking.

Outsolvi

Native Outlook (Desktop, Web, New Outlook) plus Gmail at full feature parity, with confidence scoring and AI included at base.

Best for

Outlook-heavy AE teams whose load-bearing need is tracking accuracy and follow-up intelligence.

Pros

Office.js add-in covers all three Outlook surfaces with feature parity to Gmail
Tier 1 to 5 confidence scoring on opens exposed to the rep
Hot-lead detection and AI reply sentiment at $7 yearly base tier
Metadata-only privacy (no email body stored), SOC 2 aligned

Cons

•No mature Salesforce native sync today (webhook-based logging)
•No built-in meeting scheduler
•No mail-merge or automated cold sequences

Pricing

$7/user/mo yearly. $12/mo monthly. Teams Pro $20/user/mo yearly.

Verdict

The top pick for Outlook teams because Outlook is the primary surface, not the second platform built.

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Yesware

Mature Office.js add-in, deep Salesforce sync, but AI gated to Premium.

Full comparison

Best for

Salesforce-native teams running cadences with Outlook-based reps.

Pros

Office.js add-in works on Outlook Desktop, Web, and New Outlook
Deep bidirectional Salesforce activity sync
Built-in meeting scheduler removes Calendly per rep

Cons

•AI features (reply sentiment, advanced reporting) gated to Premium at $35 yearly or $45 monthly
•Outlook commit cadence has been lighter than Gmail since the 2017 Vendasta acquisition
•No confidence scoring on opens; counts every pixel load

Pricing

Pro $15/user/mo yearly or $20 monthly. Premium $35 yearly or $45 monthly. Enterprise $65.

Verdict

Right pick when load-bearing Salesforce sync and structured cadences across 15+ reps justify the Premium pricing.

HubSpot Sales Hub

Enterprise sales platform with native Outlook add-in, priced as a platform commitment.

Full comparison

Best for

Teams already on HubSpot CRM where Sales Hub completes the stack.

Pros

Native Outlook add-in with Microsoft 365 integration
Deep HubSpot CRM integration (contacts, deals, pipeline)
Document tracking and meeting scheduler built in

Cons

•Realistic tier is Pro at $100/user/mo yearly; Starter at $20 lacks the useful features
•Most value assumes HubSpot CRM as the system of record
•Confidence scoring not exposed to the rep at any tier

Pricing

Free tier capped. Starter $20/user/mo yearly. Pro $100. Enterprise $150.

Verdict

Right pick if HubSpot is your platform commitment. For tracking-only buyers, 14x more expensive than Outsolvi for the comparable feature set.

Cirrus Insight

Salesforce-sync product with native Outlook add-in, tracking bundled in.

Full comparison

Best for

Salesforce-native teams where activity auto-logging is the load-bearing job.

Pros

Genuinely mature Salesforce activity auto-logging
Native Outlook add-in plus Gmail Chrome extension
Calendar scheduling links bound to Salesforce records

Cons

•Tracking is bundled inside Salesforce productivity, not the core product
•No confidence scoring on opens
•Pricing $14-$48/user/mo, more expensive than Outsolvi for the tracking-specific feature set

Pricing

Starter $14/user/mo. Pro $27. Expert $48.

Verdict

Right pick for Salesforce-first teams. For tracking-only buyers, downgrading Cirrus to its cheapest tier and adding Outsolvi for tracking usually saves money.

Mailbutler

Cross-platform email assistant covering Apple Mail, Gmail, and Outlook.

Full comparison

Best for

Teams with Apple Mail users alongside Outlook and Gmail.

Pros

One of the few serious cross-platform options including Apple Mail
Smart Assistant AI writing layer
Templates, signatures, task management bundled

Cons

•Outlook add-in is functionally lighter than the Apple Mail and Gmail versions
•Tracking analytics gated to Smart tier ($14.95 yearly) and above
•No confidence scoring on opens

Pricing

Tap $4.95/user/mo yearly. Smart $14.95. Pro $32.95.

Verdict

Right pick if Apple Mail support is the load-bearing reason you are here. For Outlook-only or Outlook + Gmail teams, the lighter Outlook add-in makes Outsolvi the better fit.

Boomerang

Scheduling and inbox-productivity tool with Outlook add-in and bundled tracking.

Full comparison

Best for

Inbox-zero personal productivity users who treat opens as occasional curiosity.

Pros

Best-in-class send-later, snooze, and recurring sends
Respondable AI writing-quality feedback
Personal tier at $4.98/mo is cheapest scheduling option

Cons

•Tracking is a side feature, not the core product
•Outlook add-in is functionally lighter than the Gmail extension
•Team analytics gated to Premium at $49.99/user/mo

Pricing

Personal $4.98/mo. Pro $14.98. Premium $49.99/user/mo.

Verdict

Right pick for scheduling-first users who want light tracking on the side. For tracking-first AE work, Premium at $49.99 is 2.5x Outsolvi Teams Pro for the comparable feature set.

Frequently asked questions

Which trackers ship a native Outlook add-in?+

Six in 2026 with full Office.js feature parity: Outsolvi, Yesware, HubSpot Sales Hub, Cirrus Insight, Mailbutler, and Boomerang. The eight Gmail-only trackers (Mailtrack, Mixmax, Streak, Right Inbox, GMass, Saleshandy, Vocus, EmailAnalytics) do not. Some "support Outlook" through SMTP or web-app workarounds, which are not equivalent to a native add-in.

Does Outsolvi work on classic Outlook Desktop?+

Yes. The Outsolvi Office.js add-in installs from Microsoft AppSource and works in Outlook Desktop (classic Win32), Outlook on the Web, and New Outlook with one install. The add-in attaches to your Microsoft 365 mailbox, so it appears across all three surfaces automatically once your admin authorises it.

What is the difference between an Office.js add-in and an SMTP integration?+

An Office.js add-in runs inside the Outlook compose pane and right-rail with full UI surface. An SMTP integration connects to your Outlook mailbox externally through IMAP/SMTP credentials but does not run inside Outlook itself; you have to leave Outlook to do anything with the tool. For tracking workflows the difference is major: native add-ins integrate with the rep's daily workflow; SMTP integrations force context-switching.

Is Outlook commit cadence really lighter than Gmail for some trackers?+

For Yesware, Mailbutler, and Boomerang, yes. The Gmail extension is the flagship surface and gets the most feature investment; the Outlook add-in is functionally lighter (fewer scheduling options, fewer UI refinements). For Outlook-first teams committing to an annual contract, it is worth checking the current Outlook roadmap with the vendor before signing. Outsolvi is built Outlook-first with no parity gap.

What about Outlook Mobile?+

Office.js add-ins (Outsolvi, Yesware, HubSpot, Cirrus Insight) have limited mobile support today because the Outlook mobile app's add-in surface is more constrained than Desktop or Web. Tracking pixels still fire when the recipient opens on mobile; the rep-side experience is desktop-first. Mobile send-and-track is a known gap across the category.

How do I evaluate an Outlook tracker on a 14-day trial?+

Three tests. (1) Install on all three Outlook surfaces (Desktop, Web, New Outlook) and verify the add-in appears identically in each. (2) Send a tracked test email, open it on a colleague's Microsoft 365 inbox behind Microsoft Defender for Office 365, and confirm the tracker correctly grades the Defender pre-fetch as Tier 4 or 5 (machine), not Tier 1 (human). (3) Compare open counts against your previous tracker on real campaigns for 7 days. Expect the new tool's count to be 20-40 percent lower if it has confidence scoring.

Ready to try the #1 pick?

Outsolvi's 14-day free trial requires no credit card and installs in 2-3 minutes per Outlook surface. The detailed setup guide is in the [Outlook and Gmail setup post](/blog/outlook-gmail-email-tracking-setup).

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Nate SummersCo-Founder, Outsolvi

Nate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi runs Tier 1 to 5 confidence scoring on every open, native in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.

Last reviewed May 24, 2026Editorially independent

We update these pages when the underlying mechanics change — new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.

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