Written by the maker of OutreachSheet, so read it with that in mind. YAMM details come from yamm.com/pricing on 18 October 2026, in US dollars as shown; YAMM says prices vary by billing country. Check the vendor's page before you buy.
The short answer
Choose YAMM if you want open and click tracking, attachments, Gmail templates, or a free tier for small sends. Choose OutreachSheet if you want a written sequence by language, replies sorted into groups, and one payment.
| OutreachSheet | YAMM | |
|---|---|---|
| How you pay | One payment: £29, £79 or £129 at launch (£49, £99, £149 after the first 50 buyers) | Free: up to 20 recipients a day. Pro gmail.com: US$72 a year, up to 400 a day. Pro Google Workspace: US$144 a year, up to 1,500 a day. Per user |
| Where it runs | A Google Sheet you copy into your own account; the script runs there | An add-on for Google Sheets and Gmail, installed from the Google Workspace Marketplace |
| Follow-ups | A schedule of up to four steps, in the same thread as the first email; stops once someone replies | "Launch follow-up campaigns" and "Follow up in the same thread" are listed features |
| What comes back | Sorted into real replies, out-of-office, bounces and unsubscribe requests | Tracks responses, bounces and unsubscribes |
| Tracking | No open or click tracking, by design | Open and click tracking on every plan |
| Languages | Sequences chosen by country, from one list; no translation | Not stated on its pricing page |
| Pacing | A few emails at a time, in your chosen hours and weekdays | "Schedule mail merges" listed |
What it costs over two years
Two years of YAMM Pro is 2 × US$72 = US$144 on a gmail.com account, or 2 × US$144 = US$288 on Google Workspace, for one user. OutreachSheet Do it yourself is a single £29 at launch or £49 after, with free fixes to version 1. YAMM prices are in USD and ours are in GBP, so this is not a currency-converted comparison.
Who should choose OutreachSheet
- One person or a small business sending cold outreach from one Gmail or Workspace account.
- You write to several countries and want each person's own language from one list.
- You want follow-ups that run on a schedule and stop on a reply, with no tracking pixels, for one payment.
Who should choose YAMM
- You send newsletters, invites or notices more than cold outreach, and want open and click numbers.
- You need personalised attachments or Gmail layouts.
- You send fewer than 20 recipients a day and want it free.
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.
Next
How automatic Gmail follow-ups work · Three ways to send mail merge from Google Sheets · OutreachSheet packages
Last checked: 18 October 2026.