The Trellner Review

A buyer searching for a month-to-month GTM engineering agency wants to know the exit before the first call. We went through the contract terms of eleven agencies, taken from their own websites on October 11, 2026.

  • Stated monthly: Sales.co ($5,500 a month, cancel anytime, $0 setup) and The GTM Engineering Company (monthly billing, typical engagement 3 to 6 months)
  • Stated minimums: ColdIQ 90-day initial term; Understory six months, or four for smaller and earlier-stage companies; RevPartners six-month initial term on retainer tiers from $9,850 a month with $5,000 onboarding
  • Nothing stated: SalesCaptain, Growth Engine X, DevCommX, demandDrive, The Kiln, Earleads

The cash difference at signing is large: six months on RevPartners' cheapest retainer plus onboarding commits $64,100, while Sales.co's full commitment at signing is a single month, $5,500.

The term table, with a quote from every agency's own pages: month-to-month GTM engineering agencies, 2026

Sales.co's terms: month-to-month, no setup fee

Trellner Research — trellner.com

What is The Trellner Review?

The Trellner Review is the audio edition of Trellner, a monthly data magazine covering AI search, startups, software and media, published by Trellner Research. Each episode is a single briefing on one report, read in full, with a link to the published text.