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Sales.co vs Growth Engine X
Updated October 11, 2026. Growth Engine X facts read October 11, 2026.
Growth Engine X in one line: A cold email agency that sends 8 million+ emails a month across its clients and offers a free test campaign to companies that qualify; no price or contract term is on its site.
This page compares Growth Engine X with Sales.co's GTM engineering package, not with Sales.co's email-only plans (those are on sales.co/pricing). Sales.co publishes this page, so read it with that in mind. Every Growth Engine X fact comes from its own site, read October 11, 2026. "Not stated" means the pages we read do not say.
| Sales.co | Growth Engine X | |
|---|---|---|
| Published price | $5,500/mo flat, one package | Not published |
| Pricing model | Flat monthly fee, one package | Not published; a free test campaign for companies that qualify, then a paid partnership |
| Setup fee | None | Not stated |
| Term | Month-to-month, cancel anytime | Not stated |
| Channels | Email, cold calls, ads, LinkedIn | Cold email |
| What is included | Signals, list building, data enrichment and validation, copywriting, email to the whole market, cold calls, ads and LinkedIn to the highest-intent accounts, replies answered in under 10 minutes, a dedicated account manager, dashboards and exports, CRM integration | Cold email infrastructure with backup domains kept warm, unlimited LinkedIn data and B2B email addresses, up to 5,000 emails sent per day, CRM integration through OutboundSync and CRM enrichment. Domains, inboxes, Clay tables and lists are transferable to the client |
| Built for | Not stated | B2B companies with $1M+ in revenue, a target market of 100,000+ contacts and lifetime gross profit over $5,000 per customer |
| Clay | Uses Clay and Claude inside software it built itself | Quotes a Clay engineer calling its founder's workspace Clay's most used |
| Clay partner directory | Not listed | Elite Studio tier |
Volume and channels
Growth Engine X states a ceiling of 5,000 emails a day per client. Over 22 sending days that is up to 110,000 emails a month on one channel. Sales.co's GTM engineering page does not state an email volume; it describes email to the whole market every 30 to 90 days, plus calls, ads and LinkedIn to the accounts showing intent. If raw email volume into a market of 100,000+ contacts is what you are buying, Growth Engine X states the larger number.
When Growth Engine X is the better pick
Growth Engine X launches a free test campaign before you pay anything, if you qualify. It sends up to 5,000 emails a day for a client, and it is one of six Elite Studio partners in Clay's directory. Sales.co's page offers no free test, and Sales.co is not in the directory.
When Sales.co is the better pick
Pick Sales.co if email alone is not enough for your market and you want calls, ads and LinkedIn aimed at the accounts showing buying signals, with replies answered in under 10 minutes. The price is published: $5,500 a month, month-to-month.
Questions to ask Growth Engine X
- What is the monthly fee after the free test, and is there a minimum term?
- Do I qualify for the free test, and how long does it run?
- Who answers positive replies: your team or mine?
- How many emails a day would you send for a market my size?
Why buyers look elsewhere, and ten other agencies in one table: Growth Engine X alternatives.
Sources
- Sales.co: sales.co/gtm-engineering, read October 11, 2026.
- Growth Engine X: growthenginex.com, read October 11, 2026.
- Clay Solutions Partner Directory: clay.com/experts, read October 11, 2026 (186 partners listed).
Related pages
Best GTM engineering agencies (2026) · GTM engineering agency cost · Best Clay agencies · Sales.co GTM engineering
Sales.co vs SalesCaptain · Sales.co vs ColdIQ · Sales.co vs Understory · SalesCaptain alternatives · ColdIQ alternatives · Understory alternatives · Growth Engine X alternatives
GTM engineering agency for B2B SaaS · GTM engineering agency for startups · Agency vs in-house GTM engineer · Outsourced GTM engineering · Month-to-month GTM engineering agencies · Signal-based outbound agencies · Multichannel outbound agencies · Account-based outbound agencies
FAQ
How much does Growth Engine X cost compared with Sales.co?
Growth Engine X does not publish a price on the pages we read. Its pricing model: not published; a free test campaign for companies that qualify, then a paid partnership. Sales.co's GTM engineering package is $5,500 a month, flat, with no setup fees.
Does Growth Engine X have a minimum term?
Growth Engine X does not state a term on the pages we read. Sales.co is month-to-month and you can cancel anytime.
Is Growth Engine X a Clay partner?
Yes. Clay's Solutions Partner Directory lists Growth Engine X in the Elite Studio tier (read October 11, 2026). Sales.co is not in the directory; it uses Clay inside its own software.
When is Growth Engine X the better pick?
Growth Engine X launches a free test campaign before you pay anything, if you qualify. It sends up to 5,000 emails a day for a client, and it is one of six Elite Studio partners in Clay's directory. Sales.co's page offers no free test, and Sales.co is not in the directory.