GMass is a Gmail extension billed per user, per year or month. OutreachSheet is a Google Sheet you buy once. GMass offers tracking and advanced team features; OutreachSheet is a one-time purchase for a simpler single-account workflow.
Written by the maker of OutreachSheet, so read it with that in mind. Competitor details below come from each company’s own pages on 17 October 2026. Prices and features change, so check the vendor’s page before you buy.
GMass alternative with no recurring fee?
Choose GMass if you want tracking, A/B testing, an API, inbox rotation or team plans. Choose OutreachSheet if you are one sender who wants follow-ups and reply sorting for a single payment.
| OutreachSheet | GMass | |
|---|---|---|
| How you pay | One payment: £29, £79 or £129 at launch (£49, £99, £149 after the first 50 buyers) | Per user: Standard $20/month ($249 paid annually); Premium $29/month ($349 paid annually); Professional $49/month ($599 paid annually). Monthly billing is $29.95 / $39.95 / $59.95 |
| Follow-up sequences | Yes, up to four steps | Not in Standard. Included in Premium and Professional |
| Where it runs | A Google Sheet you copy into your own account | Inside Gmail, as an extension |
| Tracking | No open or click tracking, by design | Custom tracking links |
| A/B testing, API, triggered emails | No | Yes, from Premium |
| Inbox rotation, priority support | No | Yes, on Professional ($599/year billed annually) |
| Teams | No: single account | Team plans available |
| Languages | Sequences chosen by country, from one list; no automatic translation | Not stated on its pricing page |
What it costs over three years
On the prices above, three years of GMass Premium billed annually is 3 × $349 = $1,047 for one user. OutreachSheet Do it yourself is a single £29 at launch or £49 after launch, with free version 1 fixes. GMass lists prices in USD and OutreachSheet prices are in GBP, so these figures are not a currency-converted comparison. GMass also includes features OutreachSheet does not.
Who should choose OutreachSheet
- One person or a small business sending from one Gmail or Google Workspace account.
- You want to pay once, not every month or year.
- You like working in a Google Sheet, and want follow-ups, paced sending and sorted replies without opt-in tracking.
What OutreachSheet does not do
It sends from a single Google account, so Gmail and Google Apps Script sending limits apply (Google’s quotas). It has no open or click tracking, no shared team inbox, and no mailbox warm-up service. Google shows an “unverified app” warning when you first authorise your own copy, because the script runs in your account; the setup guide shows each screen.
Who should choose GMass
Teams, anyone who needs A/B tests, an API or Zapier connection, tracked links or inbox rotation, and anyone who prefers to work inside Gmail rather than a spreadsheet. GMass also lists a free trial with no card on its pricing page.
Next
How automatic Gmail follow-ups work · Three ways to send mail merge from Google Sheets · OutreachSheet packages