"Cold email agency" covers at least three different businesses: agencies that send emails and hand you replies, agencies that set appointments and charge per meeting, and full outsourced SDR operations that also pick up the phone. Buying the wrong model is the most common reason these engagements fail. This comparison sorts the main 2026 options by what they actually deliver.
The comparison at a glance
| Agency | Model | Pricing | Includes calling |
|---|---|---|---|
| Sales.co | Done-for-you cold email and cold calls, end to end | Published flat: $1,999/mo email-only, $1,999/mo calls-only, $3,000/mo combined, up to 5,000 prospects/mo, month-to-month | Yes |
| Belkins | Appointment setting, meetings booked for your reps | Custom quote, retainer-based | Varies by package |
| CIENCE | Outsourced SDR teams plus their own contact data platform | Custom quote, retainer-based | Yes |
| Martal Group | Fractional sales teams, mostly for tech companies | Custom quote, tiered retainers | Yes |
| SalesRoads | US-based appointment setting and SDR outsourcing | Custom quote | Yes, calling-centric |
Two structural notes on that table. First, Sales.co is the only one with published flat pricing; the others quote after a sales call, which makes comparison shopping slow. Second, the "includes calling" column matters more than most buyers expect, because the meeting usually gets booked on the phone, not in the email thread.
Sales.co: flat-priced outbound with the phone follow-up built in
Full disclosure: this is us, so read this section as a claim sheet you can verify on a call rather than a neutral review.
Sales.co runs the entire outbound function: contact sourcing through waterfall enrichment across multiple data providers, per-prospect research feeding personalized emails rather than spintax with a first name, deliverability management, and a response to positive replies in under 10 minutes, followed by cold-call follow-up to actually book the meeting. Clients get a dedicated account manager, full data export, and CRM-ready records. You do not log into software; you get meetings and the data.
Pricing is flat and published: $1,999 per month for cold email only, $1,999 for cold calls only, or $3,000 combined, covering up to 5,000 prospects per month, month-to-month with no long-term contract. The under-10-minute reply response exists because speed to a warm reply is the single highest-leverage moment in outbound: a positive reply answered the next morning is often a dead reply.
Belkins: appointment setting with a large delivery team
Belkins is one of the best-known names in appointment setting. The model: their team researches, contacts, and nurtures prospects, and delivers booked meetings to your sales reps. They have a large client base across industries and a mature process. Pricing is by custom quote and typically retainer-based, and the engagement usually starts with a discovery process to define your ideal customer profile. A good fit if you want a large, established vendor and are comfortable with quoted pricing.
CIENCE: outsourced SDR teams plus data
CIENCE sells "people as a service": dedicated outbound SDR teams that run multi-channel campaigns (email, phone, social) backed by their in-house contact data platform. It is closer to renting a sales development department than buying a campaign. That makes it a fit for companies that want volume and a managed team, and less of a fit for small companies that need a lightweight start, since team-based engagements carry team-based pricing. Quotes are custom.
Martal Group: fractional sales teams for tech
Martal Group provides fractional sales executives and SDR teams, primarily for B2B tech companies, and can extend beyond prospecting into closing support. If you want senior sales talent involved rather than a pure top-of-funnel service, that is their differentiation. Pricing is tiered, custom-quoted retainers.
SalesRoads: US-based, calling-first appointment setting
SalesRoads runs US-based SDR teams with a strong emphasis on phone outreach, and has a long track record in appointment setting for B2B companies. If your buyers answer the phone and you specifically want native US callers, that focus is the reason to shortlist them. Custom quotes.
The alternative: tools like Instantly, Smartlead, and Lemlist
Every agency on this list competes with a spreadsheet and a $30 to $100 per month sending tool. Instantly, Smartlead, and Lemlist are all capable platforms, and if your team has an operator who can build lists, write copy, manage deliverability, and work replies every day, the tool route costs a fraction of any agency.
The honest math: the tool subscription is the smallest cost in that stack. List data, sending infrastructure, and above all the operator's time are the real spend. US SDR base salaries commonly run $50,000 to $65,000 before tools and management overhead. Agencies exist for teams that do not want to build and staff that machine. We wrote a full breakdown of this decision in our tools versus managed service comparison.
Six questions that separate these vendors
- Who writes the copy, and do I approve it? Bad copy from your domain damages your brand with exactly the accounts you care about.
- Where does the contact data come from? Single-source data (one database) has worse coverage and accuracy than waterfall enrichment across providers.
- Who owns the domains, mailboxes, and data when I leave? If the answer is "we do," leaving costs you the asset.
- What happens after a positive reply, and how fast? This is where most engagements quietly fail. Ask for the actual response-time number and whether anyone picks up the phone.
- Is pricing flat, or per meeting? Per-meeting pricing sounds safer but creates an incentive to book thin meetings that no-show.
- What is the contract term? Month-to-month vendors carry their own risk; 12-month contracts move all of it to you.
Bottom line
If you want meetings without building the machine, shortlist by model first: appointment setting (Belkins, SalesRoads), outsourced SDR teams (CIENCE, Martal Group), or flat-priced end-to-end outbound with phone follow-up (Sales.co). Then put the six questions above to each vendor on the shortlist. The answers diverge fast, and that divergence, not the logo wall, is the real comparison.