Key takeaways
- Both platforms are real — and both are inbound: you pay to be findable, then wait to be picked.
- A 3% success fee on a $500k first-year contract is $15,000 — say it out loud before you compare options.
- Marketplaces only show you brands that already know they need a co-packer. The best prospects haven't started searching.
If you run a co-packing plant, both platforms have probably emailed you. Both are real companies with real brand traffic. Neither is written about from your side of the table. Here's the manufacturer-side view.
What each one is
PartnerSlate is the established co-manufacturing marketplace: brands post projects, and the platform matches them against a database of 6,000+ manufacturers. Keychain is the venture-funded heavyweight — roughly $75M raised — indexing 20,000+ US manufacturers and matching them against brand and retailer searches with AI.
| Dimension | PartnerSlate | Keychain | Owned outbound |
|---|---|---|---|
| Cost | $0–$299/mo + 2–3% of first-year production | $5k–$100k/yr subscription | Effort or a flat retainer |
| Direction | Inbound — brands post, you quote | Inbound — brands search, you wait | Outbound — you pick the brands |
| Competition per lead | Every matching plant | 20,000+ indexed profiles | None — it's your email |
| Exclusivity | None | None | Total |
Where marketplaces genuinely make sense
- You have niche capabilities brands actively search for (unusual formats, rare certs).
- You want a passive channel running alongside referrals with near-zero effort.
- You're testing demand in a new category before investing in it.
Where they cap out
Zero exclusivity — the platform's incentive is more competition per brief. Comparison-mode buyers quoting several plants at once. And you only meet brands that already know they need a co-packer and posted about it. The brand that just landed 500 stores and hasn't started searching? Invisible.
Frequently asked questions
Q-01What does PartnerSlate cost a co-packer?
Manufacturer plans run free to $299/month, plus a success fee reported at 2–3% of first-year production value when a match becomes a contract.
Q-02What does Keychain cost manufacturers?
Annual partnership subscriptions reported between $5,000 and $100,000 depending on size and categories, with no committed volume of introductions.
Q-03Are marketplaces worth it for co-packers?
As a passive channel alongside referrals, yes — keep a free or entry-tier profile. As your primary growth strategy, no: zero exclusivity and structural price pressure.
Written by
Murtaza Udaypurwala
Founder, Feed The Line · Director, DESENO Media Agency
Murtaza runs Feed The Line, the outbound revenue engine that fills co-packer lines with qualified CPG brands. He writes about capacity economics, MOQ math, and pipeline for food & beverage plant owners.
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