10 Best Outsourced SDR Companies for 2026, Compared

The best outsourced SDR companies for 2026 are Belkins, CIENCE, SalesRoads, memoryBlue, SalesHive, Callbox, Leadium, Martal and Operatix: each puts trained reps on the phone, in the inbox and on LinkedIn to book meetings for your sales team. Anfloy publishes this list and is the tenth entry. For a small team we take over the whole GTM motion and own the result in booked, qualified meetings.

Facts about the other nine come from their own sites, opened November 9, 2026, including every price shown. The number we'd put next to an SDR retainer is pipeline: the engine Apify wrote up turned LinkedIn buying signals into $234,000 in qualified pipeline across three campaigns. If you're replacing an SDR agency, book a call and bring what your current one reports each week.

The comparison at a glance

The 10 companies

1. Belkins

Belkins says it has served B2B companies across 50+ industries since 2017 and delivers 100 to 400+ qualified appointments a year.

• Model: cold email, cold and intent calling, voicemails, SMS and WhatsApp, LinkedIn and paid ads.
• How they bill: monthly retainer packages, plus a listed pay-per-meeting program. No prices printed.
• Best for: speed; it says campaigns launch in the first 14 days and appointments arrive within the next 30.
• What to check: the Growth plan includes intent-based calling but not cold calling and voicemails, and its figures are footnoted as average yearly outcomes.

2. CIENCE

CIENCE says its SDRs call, email and use LinkedIn, booking 5 to 20+ qualified meetings a month per SDR depending on industry and target.

• Model: one SDR runs all three channels, so the buyer hears from one person.
• How they bill: published. A $2,000 campaign team, a $499 platform and offshore SDRs at $1,750 each per month, plus a bonus and a one-time setup fee. Month to month.
• What to check: the held-meeting target behind the bonus. CIENCE says it reports held meetings, not dials.

3. SalesRoads

SalesRoads says it has built more than 500 outsourced SDR teams over 19+ years, with SDRs averaging seven years of experience.

• Model: dedicated SDRs, never shared across accounts, inside your CRM with a live dashboard of dials, conversations, show rates and pipeline.
• How they bill: published, per four weeks. One SDR is $11,950; two are $16,750, which it says is 30% lower per rep. No long-term commitment.
• What to check: its FAQ says quality outsourcing starts around $12,000 a month and cheaper options may cost half as much, so compare what each quote includes.

4. memoryBlue

memoryBlue says it has run outsourced SDR programs since 2003, with reps dedicated to one client on phone, email and LinkedIn.

• Model: roughly 100+ calls, 50+ emails and 30+ LinkedIn touches a day per rep, after a two-week onboarding that is not billed.
• How they bill: no single published rate; cost depends on volume, region and structure.
• Best for: longer, complex B2B sales. It calls itself a weaker match for simple, low-price, single-call sales.
• What to check: it says ramped programs book 8 to 12 outbound meetings per SDR per month, and its audition-to-hire model lets you move a rep onto your payroll.

5. SalesHive

SalesHive runs lead generation, cold calling, cold email and appointment setting for B2B teams, with a core SDR team it says is 100% US-based.

• Model: US SDRs plus its own AI platform, where managed campaigns run.
• How they bill: one flat monthly fee, no per-meeting pricing. Custom quoted; annual plans carry a 12-month commitment.
• What to check: SalesHive says no one can honestly promise a fixed number of meetings, and commits to daily outreach volume instead. Ask what that volume is.

6. Callbox

Callbox says it was founded in 2004 and provides outsourced B2B lead generation and sales support.

• Model: SDRs backed by voice, email, LinkedIn, chat and events.
• How they bill: no price on its SDR page.
• Best for: SDRs plus data, content and dashboards wired into your CRM.

7. Leadium

Leadium runs appointment setting through email, phone, LinkedIn, SMS and gifting.

• Model: outbound plus an inbound service it says reaches new leads in under five minutes.
• How they bill: all contracts month-to-month; no published price.
• What to check: start dates; onboardings open on the 1st or the 15th.

8. Martal

Martal says it employs onshore B2B sales reps in the EU, North America and LATAM.

• Model: email, LinkedIn and calls, with a custom sending domain per sales executive.
• How they bill: a three-month pilot, then a flat monthly subscription; the tier with closing support adds sales commission.

9. Operatix

Operatix works only with B2B software vendors and has a 300+ strong SDR team across North America, EMEA, LATAM and APAC.

• How they bill: no price on its homepage; a client testimonial there describes a partly performance-based model.

10. Anfloy

We take over the GTM motion for small teams and own the result in qualified meetings.

• Model: the whole motion. Strategy and ICP, offers, funnels and landing pages, signal-based outbound across email, LinkedIn and the phone plus LinkedIn content, and agentic RevOps with a person approving what goes out, all run on one AI revenue engine.
• How we bill: scoped on a call, measured on qualified meetings the client accepts, reviewed weekly with 30/60/90-day checkpoints.
• Best for: small B2B teams whose gap is more than dials.
• What to check: data, mailboxes and accounts are set up in your name, and you own them. If you only need a phone team making a set number of dials, pick an agency above.

How to choose an outsourced SDR agency

What I'd ask any SDR agency before signing, in this order:

• Who owns the domains, mailboxes and lead lists when we stop? If the agency sends from its own domains and keeps the list, you leave with a meeting count and nothing that keeps running. Get it in the contract.
• What counts as a qualified meeting? Title, company size, and whether the prospect has to show up. Settle it before the first invoice, or you'll argue about it after. CIENCE ties its bonus to held meetings, which is the right default.
• What does the weekly report show? Dials and emails sent only prove the reps were busy. Ask for replies, meetings held and pipeline by segment, and read a sample of what went out under your name.
• How many meetings per SDR per month once ramped, and how long is the ramp? Ask what you pay if it runs long.
• What is the minimum term? Terms above run from month to month to a 12-month annual plan. I'd take the shortest term on offer until one ramped month shows real meetings.

When an SDR program underdelivers, check the list and the offer before blaming the reps. A good rep calling the wrong accounts with no reason for them to talk now still books very little.

Outsourced SDR vs an AI-run GTM engine

An SDR agency fits when the offer is proven, your team is ready to take meetings, and the gap is hours on the phone. memoryBlue puts a fully loaded in-house SDR at roughly $140,000 a year, which is the hire every agency above prices against.

An engine fits when the gap sits before the dial: who to contact, why now, which offer, which page, and what happens after a reply. For The Voice Box we built the whole motion in five days, with every person pulled from LinkedIn on a buying signal. It runs on their own infrastructure, and the first send booked 10 meetings at an 11.4% reply rate (case study).

The trade is your time. An engine needs someone on your side to approve what goes out, and an agency asks less of you at the start. See also GTM for small teams, Anfloy vs an in-house hire and AI SDR vs GTM engineer.