Best 10 Outlook Add-ins in 2026
Compare the 10 best Outlook add-ins for 2026, from email tracking and AI writing to scheduling, CRM, and collaboration.
Compare the top 10 email tracking software tools for 2026 by price, features, and platform support to find the best fit for your inbox.
As Head of Customer Success at Mailbutler, I help people improve the way they communicate and work more efficiently. I enjoy writing about productivity, email management, and technology. Outside of work, I love spending time in nature.
Email tracking tools tell you when a message was opened and when a link was clicked, right inside your inbox. The category ranges from free Gmail checkmarks to full sales engagement platforms with sequences and CRM sync — here's how the top 10 email tracking software tools compare in 2026.
| Tool | Starting price | Email clients | Best for |
|---|---|---|---|
| Mailbutler | Free / $4/mo | Gmail, Outlook, Apple Mail | Advanced tracking, AI follow-ups, CRM sync + inbox productivity suite |
| Yesware | Free / $15/mo | Gmail, Outlook | Salesforce-centric sales teams |
| Mixmax | Free / $29/mo | Gmail only | Gmail-native sales engagement |
| HubSpot Sales Hub | Free / $20/mo | Gmail, Outlook | Tracking bundled with a free CRM |
| Streak | Free / $49/mo | Gmail only | Full pipeline inside Gmail |
| SalesHandy | Free / $25/mo | Gmail, Outlook | Cold outreach + document tracking |
| GMass | Free trial / $25/mo | Gmail only | High-volume mail merge campaigns |
| Right Inbox | Free / $7.95/mo | Gmail only | Budget all-in-one Gmail add-on |
| Mailtrack | Free / $5/mo | Gmail only | Simple, cheap read receipts |
| Boomerang | Free / $5/mo | Gmail only | Scheduling with tracking included |
Prices are per user/month. Confirm current rates on each vendor's site before buying.
Mailbutler adds advanced email tracking — engagement history, device/location data, per-recipient tracking — plus AI-powered follow-ups and CRM sync, alongside mail merge, shared-inbox tools, and signature marketing. As email tracking software goes, it's also the lowest-priced option on this list, with paid plans starting at $4/user/month.
Use Mailbutler if:
Skip it if:
Yesware pairs email tracking with a deep Salesforce integration, syncing sends, opens, and clicks straight into CRM records. Plans run from free up to $65–85/user/month for Enterprise.
Use Yesware if:
Skip it if:
Mixmax runs inside the Gmail compose window, with tracking, sequences, and a well-rated meeting scheduler. Paid plans start around $29/user/month, up to $89 for Salesforce sync.
Use Mixmax if:
Skip it if:
HubSpot's free CRM includes basic email tracking with no time limit. Paid Sales Hub tiers start at $20/seat/month and add sequences and reporting.
Use HubSpot if:
Skip it if:
Streak turns Gmail into a visual CRM with pipelines, labels, and tracking built in. Free tracking tools are available; the CRM plans start at $49/user/month.
Use Streak if:
Skip it if:
SalesHandy combines email tracking with document/attachment tracking and cold outreach sequences. Plans start around $25/month with unlimited connected inboxes.
Use SalesHandy if:
Skip it if:
GMass turns Gmail into a mail-merge and campaign tool, tracking opens, clicks, and replies per campaign. Standard plan runs about $25–30/month.
Use GMass if:
Skip it if:
Right Inbox bundles tracking with scheduling, reminders, and mail merge for $7.95/month. See Mailbutler's Right Inbox comparison for a feature-by-feature look.
Use Right Inbox if:
Skip it if:
Mailtrack, now Mailsuite, shows opens with simple WhatsApp-style checkmarks. Paid plans start around $5/month. Mailbutler has a Mailtrack comparison if you're weighing simple vs. full-featured.
Use Mailtrack if:
Skip it if:
Boomerang is best known for scheduling and "return to inbox if no reply," with read receipts and click tracking included. Paid plans run $5–50/month. Mailbutler's Boomerang comparison breaks down the overlap.
Use Boomerang if:
Skip it if:
| If you care most about... | Pick |
|---|---|
| Lowest overall price + advanced tracking & productivity features | Mailbutler |
| Salesforce-native tracking | Yesware |
| Gmail-native sequences | Mixmax |
| Free CRM-bundled tracking | HubSpot Sales Hub |
| Lightweight Gmail CRM | Streak |
| Cold outreach + document tracking | SalesHandy |
| High-volume mail merge | GMass |
| Scheduling + reminders in a lightweight Gmail add-on | Right Inbox |
| Simplest possible read receipt | Mailtrack |
| Scheduling first, tracking second | Boomerang |
Most email tracking software on this list is Gmail-only, which narrows the field fast if you're on Outlook or Apple Mail. For advanced tracking paired with AI-assisted follow-ups, CRM sync, and a broader inbox productivity toolkit across all three major clients, Mailbutler is a strong starting point — free to try, with paid plans from $4/user/month.