10 Best Outsourced SDR Companies Compared (2026)

The best outsourced SDR companies in 2026 are Armasourcing, Belkins, CIENCE, SalesRoads, Martal Group, Callbox, memoryBlue, Leadium, Superhuman Prospecting, and SalesHive. They differ on three things that matter more than the logo wall: whether you pay per booked meeting or for a dedicated team, whether the callers are US-based or offshore, and whether the vendor runs your outbound for you or hands you people to run yourself. This guide compares all ten on those terms, including appointment setting companies that never use the letters SDR.

Armasourcing is on this list, at number one, and we say so plainly below, including the cases where a per-meeting agency is the better buy.

How we picked these outsourced SDR companies

Every provider here has a live public website describing an outsourced SDR, appointment setting, or B2B lead generation offer, appears in current US search results for outsourced SDR terms, and serves English-speaking B2B companies. Descriptions reflect each provider’s own public positioning as of September 2026, and every entry links to its own site so you can verify rather than take our word for it.

A note on the roundups you will find ranking for this search: nearly all are written by an SDR agency that places itself first. So is this one. The difference we try to earn is that we say so up front, we include a real limitation for our own entry, and we date and check every link.

No pricing figures appear below. Retainers in this category are quoted against list size, channel mix, and team size, and per-meeting rates move with the vertical, so any number we printed would mislead you. Where the cost model itself differs (per booked meeting, monthly retainer for a managed program, or a flat monthly dedicated team), we say so, because that difference shapes how the vendor behaves.

The 10 best outsourced SDR companies at a glance

1. Armasourcing

Armasourcing builds dedicated outbound teams from the Philippines and manages them after placement: recruiting, voice screening, payroll, time tracking, call quality reviews, and a replacement path if a caller is not working out. The team works only your list, your CRM, and your qualification bar, on a flat monthly engagement rather than per meeting. Companies that need one caller rather than a team start with a single cold calling virtual assistant or lead generation VA, and companies that want meetings booked straight into closers’ calendars use the appointment setting team. You hear the calls, you own the data, and the callers are yours for as long as the engagement runs.

Best for: companies that want callers dedicated to their pipeline and paid for time worked, not for volume of meetings booked.
Worth knowing: we do not guarantee a number of meetings and our callers are not US-based. A flat monthly team is only cheaper than per-meeting pricing when you feed it a real list and a real script; if you want a vendor to own the strategy end to end and bill you per result, Belkins or Leadium is closer to that shape. If a US accent is a requirement for your buyers, look at SalesHive or SalesRoads.

2. Belkins

Belkins is a B2B lead generation agency that runs omnichannel appointment setting and, on its own site, guarantees a range of yearly appointments with your ideal clients. The company has been operating since 2017 and positions itself on the revenue its clients have generated.

Best for: companies that want a contractual number of meetings rather than a team.
Worth knowing: a meeting guarantee is a volume incentive. Read the definition of a qualified appointment carefully, because that definition is what the guarantee actually delivers.

3. CIENCE

CIENCE describes itself as managed B2B lead generation and go-to-market execution: managed SDR teams, audience data, outbound campaigns, inbound qualification, and AI-supported execution, sold as a system it builds and then runs for you.

Best for: mid-market companies that want data, outbound, and inbound qualification from one vendor.
Worth knowing: buying the whole system means the vendor sits between you and your pipeline data. Agree up front on what you keep if the engagement ends.

4. SalesRoads

SalesRoads describes itself as a sales outsourcing agency offering B2B lead generation, appointment setting, and SDR services, with an emphasis on measurable results. It is a US agency and sells the full outsourced sales function rather than a single channel.

Best for: companies that want a US agency to run lead generation and appointment setting as one program.
Worth knowing: an agency that runs the whole function needs a clear scope. Ask which channels are in the quote and how results are reported.

5. Martal Group

Martal Group is a global B2B lead generation and sales agency built on outsourced SDR teams, and it publishes one of the larger roundups of appointment setting companies ranking for this search, with itself at number one.

Best for: companies that want a large, established agency with international reach.
Worth knowing: the bigger the agency, the more important it is to know which team, and which callers, you actually get. Ask to meet them before you sign.

6. Callbox

Callbox is a B2B lead generation agency and appointment setting company that books sales meetings with decision-makers across B2B industries, running multichannel campaigns with a global delivery model.

Best for: companies that want multichannel campaigns from an established agency.
Worth knowing: Callbox publishes its own roundup of appointment setting companies with itself at number one. Treat vendor roundups, including this one, as a starting list and verify each entry yourself.

7. memoryBlue

memoryBlue is a high-tech inside sales firm that recruits, trains, and runs SDRs, and describes itself as the source for inside sales development recruitment, training, and execution. Because recruitment and training are part of its own description of the service, it is the vendor to look at if you expect to build an in-house SDR team later.

Best for: tech companies that want outsourced SDRs now and an in-house team later.
Worth knowing: the high-tech focus is a real specialty. If you sell outside software and technology, ask for references in your vertical.

8. Leadium

Leadium is a B2B lead generation agency that delivers sales appointments and positions itself on hitting revenue goals every quarter with an experienced team and a defined process.

Best for: companies that want the agency to own the outbound process end to end.
Worth knowing: ask what happens to the sequences, the data, and the domains at the end of the engagement, because an agency that owns the process usually owns the assets too.

9. Superhuman Prospecting

Superhuman Prospecting is a B2B sales agency whose own headline is cold calling and outbound sales prospecting, with separate service lines for cold calling and appointment setting.

Best for: companies whose outbound is phone-led and want a specialist.
Worth knowing: a cold calling specialist will be candid that lists and offers matter more than dialing. Bring both, or budget for the agency to build them.

10. SalesHive

SalesHive is a B2B sales agency that books qualified meetings with US-based SDRs running cold calling and email on its own platform, with no long-term contracts.

Best for: companies that need US-based callers and want a short commitment.
Worth knowing: US-based SDRs are the premium shape in this category. If the accent is not a buying factor for your prospects, you are paying for it anyway.

What an outsourced SDR team actually does

An outsourced SDR team does the top of the funnel that your closers should not be doing: building or cleaning the target list, running cold calls and email sequences, qualifying the people who respond, and booking meetings for your account executives. Some vendors add data sourcing and inbound lead qualification; a few will also handle renewals and win-back campaigns, which is closer to telemarketing than to sales development. In the US, any program that calls consumers has to comply with the FTC’s Telemarketing Sales Rule; a B2B program has fewer constraints, but ask the vendor how it handles do-not-call and consent anyway.

The single biggest difference between vendors is the incentive. A company paid per booked meeting optimizes for meetings that pass its own definition of qualified. A company paid a flat monthly rate for a dedicated team optimizes for keeping you as a client, which means meetings your closers actually want. Neither is dishonest. They just push the callers in different directions, and you should pick the direction you want.

How to choose between them

• Decide who owns the strategy. If you have a proven offer, a list, and a script, buy a dedicated team and run it. If you have none of those, buy an agency that builds them, and expect to pay for that work whether or not the meetings come.
• Define a qualified meeting in writing. Title, company size, a stated problem, and a confirmed calendar slot. Every vendor on this list will agree to a definition; the point is to have one before the first invoice.
• Ask to hear the calls. A vendor that will not share recordings is asking you to trust a spreadsheet. A dedicated team you can listen to is easier to coach and easier to trust.
• Ask who keeps the assets. Sending domains, sequences, enriched data, and the CRM records belong to someone at the end. Make it you.
• Match the caller to the buyer. If your buyers are US enterprise executives who screen calls by accent, pay for US-based SDRs. If they are owner-operators and SMB decision makers, a trained offshore caller who knows the offer performs well at a fraction of the cost. Our US versus Philippines staffing cost comparison shows the gap for the same role.
• Start smaller than you think. One caller on one list for one month tells you more than a ten-seat program on a guess. Our outbound call center services page explains how a single seat grows into a team.

Frequently asked questions

What is an outsourced SDR company?

An outsourced SDR company provides sales development representatives who prospect, qualify, and book meetings on your behalf. Some sell the outcome (a number of booked meetings), some sell a managed program on a retainer, and some place a dedicated team that works only your pipeline for a flat monthly rate.

How much does it cost to outsource SDRs?

It depends on the model. Per-meeting agencies charge for each qualified appointment, managed programs charge a monthly retainer set by channel mix and team size, and dedicated-team providers charge a flat monthly rate per seat. Offshore teams cost a fraction of US-based teams for the same hours. We do not publish figures here because they change quarterly; ask each vendor for a quote against the same list and the same definition of a meeting.

Is it better to outsource SDRs or hire in-house?

In-house SDRs learn your product deeply and can be promoted into closing roles, but take months to recruit and ramp and leave often. Outsourcing gets a trained caller on your list in weeks and lets you scale up or down without hiring. Many companies run both: an outsourced team for volume and one or two in-house SDRs for strategic accounts.

What is the difference between an SDR company and an appointment setting company?

In practice, very little. Appointment setting companies book meetings from a defined list; SDR companies usually add list building, qualification, and multichannel sequencing on top. Vendors use both labels for the same service, so compare on what they actually do, not on the name.

The short version

If you want a vendor to own your outbound and bill you per meeting, Belkins, Leadium, and CIENCE are built for that. If you have an offer and a list and you want callers who work only your pipeline, paid for their time rather than for volume, build an outsourced SDR team with a managed provider and keep the recordings, the data, and the domains. That is the gap Armasourcing was built for. Book a call and we will tell you honestly, as this list does, whether a per-meeting agency would serve you better.