GMass vs OutReach Pilot

GMass is the veteran of Gmail mass mail: it can send through Gmail or its own SMTP relay, and Professional adds inbox rotation. We are smaller and self-hosted, and we are strict about what counts as an open.

GMass pricing: $25-$55/month, $249-$599/year · free option: 7-day trial, 50 emails/day

Side by side

Capability	OutReach Pilot	GMass
Mail merge from CSV or a published Google Sheet link	Yes	Yes
Multi-step follow-up sequences	Yes	Yes
Stop a sequence on reply	Yes (IMAP or OAuth)	Yes
Human vs proxy vs bot open classification	Yes	No
Per-recipient timeline with IP, user agent and verdict	Yes	Opens/clicks only
Pre-send MX and disposable-domain verification	Yes	No
CSV export and signed webhooks	Yes	API/Zapier, unsigned
Self-hosted: recipient data stays on your machine	Yes	No
Price	$49 launch / $79 list / $12 monthly	$249+/year
Free tier	50/day	Trial 50/day

Where GMass is genuinely better

Sends through its own SMTP relay, so a single mailbox can exceed Gmail's 500/day ceiling
Inbox rotation (MultiSend) across several Gmail accounts on the Professional plan
Much larger user base, more tutorials and third-party integrations
Native Google Sheets integration without publishing the sheet

What OutReach Pilot does differently

Open tracking counts every pixel load, including Apple Mail Privacy Protection and corporate scanners, so reported open rates run high
Campaign data and recipient lists live in GMass's cloud, not on your machine
Sequences, and most advanced features, sit behind the $35-$55/month tiers
No pre-send MX or disposable-domain verification

Verdict

Choose GMass if you need SMTP relay or inbox rotation to exceed Gmail's limits. Choose OutReach Pilot if you want honest numbers, your data on your own machine, and a flat annual price.

Add to Chrome - free Get OutReach Pilot - $49 launch Or monthly $12

Comparison based on public pricing and documentation as of 2026-10. GMass is a trademark of its owner; we are not affiliated. See the full comparison index or read how we handle data.