List building agencies for SaaS companies
9 agencies in the index offer list building for SaaS companies. Ranked by the evidence on record, the first three are CIENCE (Denver, US, from $2,499 a month), Hypergen (HQ not published, from $5,000 a month) and Callbox (Encino, US). Contact data decays every month, so ask how emails and phone numbers are verified and how often the list is refreshed. SaaS buyers receive more cold outreach than almost any other segment, so a specific trigger such as a new hire, a funding round or a tool change matters more than volume. 5 of the 9 publish a monthly minimum, from $2,499 to $10,000, with a median of $5,000. None of them advertise pay-per-meeting or pay-per-lead pricing. Besides list building, the services most often offered here are cold email, LinkedIn outreach and appointment setting. 3 build on Clay, 3 work inside HubSpot and 4 use their own or undisclosed tools. 7 have a Clutch or G2 rating on file with the date it was read. Before signing, ask for a sample sequence, the definition of a qualified meeting and who owns the domains and data afterward.
| # | Agency | HQ | Stack | From (monthly) | Model | Proof | Badges |
|---|---|---|---|---|---|---|---|
| 1 | CIENCE↗ Offices in Denver, Kyiv, Guadalajara; $5k setup + $2,499+/mo management reported | Denver, US | HubSpot, Custom | $2,499 | Retainer | G23.7 (180) | SDR PodEditor's Pick |
| 2 | Hypergen↗ Lite plans from $6.5k/mo with 6-month minimum also reported | Not published | Clay, HubSpot | $5,000 | Retainer | Clutch5.0 (15) | Clay NativeVerified DeliverabilityEditor's PickTop Outbound Agency US 2026 |
| 3 | Callbox↗ Delivery largely Philippines-based; campaign pod model; Colombia unit for LatAm | Encino, US | Custom | Ask | Not published | Clutch4.6 (128) | SDR PodEditor's PickTop Outbound Agency APAC 2026 |
| 4 | The Kiln↗ Clay-native; reported acquired by 2X | Brooklyn, US | Clay | $10,000 | Retainer | n/a | Clay Native |
| 5 | SalesHive↗ US-based SDRs; Starter $5k/mo, Growth $8k, Crush $12k; month-to-month | US | Custom | $5,000 | Retainer | G21.3 (4) | Verified DeliverabilitySDR PodEditor's Pick |
| 6 | Spring Drive↗ London + New York | London, UK | Clay | Ask | Not published | Clutch4.9 (12) | Clay Native |
| 7 | IntentSignal↗ Retainer or hybrid retainer+performance; small client roster | US | Instantly, HubSpot, Custom | Ask | Retainer | Clutch5.0 (3) | Verified Deliverability |
| 8 | Sopro↗ Also runs a Miami entity | Brighton, UK | Custom | Ask | Not published | G24.9 (17) | Top Outbound Agency UK 2026 |
| 9 | SalesBread↗ Manual LinkedIn outreach; ~$3k/mo + setup, month-to-month | US | Custom | $3,000 | Retainer | n/a | none |
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What differs for SaaS buyers
- Buying cycle:30-90 days for mid-market deals, longer once security review and procurement join.
- Budget:5 of the 9 publish a monthly minimum, from $2,499 to $10,000, with a median of $5,000.
Related pages
Questions
- How much does a list building agency cost?
- 5 of the 9 publish a monthly minimum, from $2,499 to $10,000, with a median of $5,000. Setup fees and minimum terms vary, so ask for both before comparing monthly prices.
- Retainer or pay-per-meeting?
- A retainer buys an agreed scope each month and suits a defined ICP with at least three months of runway. Pay-per-meeting moves the risk to the agency and suits offers with a short sales cycle. On this page, 0 agencies offer pay-per-meeting pricing and 0 pay-per-lead.
- How long until results?
- New sending domains need two to three weeks of warm-up before volume goes out, and list building runs alongside it. Most agencies quote first meetings in weeks four to eight.
- Does the stack matter?
- 3 of the 9 build on Clay and 3 work inside HubSpot. Ask who owns the sending domains, the data and the workflows when the engagement ends; some agencies hand them over and some keep them.