What Belkins actually is

Belkins is an outsourced SDR agency. You pay them to run outbound campaigns on your behalf: they research your ICP, build lead lists, write and send cold email sequences, sometimes layer in LinkedIn outreach and cold calling, and hand you qualified meetings booked on your calendar. You get a dedicated team (often an SDR, a researcher, and a campaign manager) working your account, using their internal playbooks and tooling stack. It’s a full-service model, closer to hiring a fractional SDR team than buying software.

Belkins built its reputation largely in the SaaS and tech space, though they work across other B2B verticals too. Their pitch is that you don’t need to hire, train, or manage SDRs yourself. They’ll test messaging, iterate on sequences, and report on activity and pipeline generated.

What memoryblue actually is

memoryblue is also an outsourced SDR agency, but it’s older and built its name specifically around cold calling and phone-first outbound, particularly for enterprise software and B2B tech companies. Where a lot of the market has drifted toward email and LinkedIn-heavy sequencing, memoryblue has leaned into training callers who can run real conversations, handle objections live, and book meetings through the phone.

They also run structured SDR-as-a-service engagements, complete with training programs for the reps themselves (memoryblue has historically operated something close to an SDR bootcamp, which is part of how they staff and train talent for client accounts). Email and multichannel outreach are part of the mix, but calling is the core differentiator in how they talk about themselves and how clients tend to use them.

The core difference

Both are agencies, not software, and both are pay-for-a-team-of-humans models rather than self-serve platforms. The real difference is channel emphasis and operating philosophy.

Belkins tends to run more of a systemized, multichannel sequence-driven motion, similar to what you’d build in-house with a modern sales engagement platform, just outsourced. memoryblue leans harder into live phone conversations as the primary lead-gen mechanic, with other channels supporting the call, rather than the other way around.

If your buyer persona responds well to a well-timed, well-researched phone call (which is still true in a lot of enterprise and traditional B2B, including large parts of financial services and insurance), memoryblue’s model maps more naturally to that. If your buyer is more likely to engage with a sharp cold email or LinkedIn touch before ever picking up the phone, which is common in SaaS and tech-forward buying committees, Belkins’ approach maps more naturally there.

Strengths and real limitations

Belkins strengths: strong process documentation, multichannel flexibility, a lot of experience specifically in SaaS and tech verticals, and generally solid reporting on campaign performance. They’ve scaled to work with a wide range of company sizes, from early-stage startups to larger enterprises.

Belkins limitations: like most agencies running email-heavy sequences, results depend heavily on deliverability, list quality, and how saturated your ICP already is with cold email. If your market has been heavily prospected by other vendors using similar tools and messaging patterns, differentiation gets harder. Onboarding and ramp time to get messaging dialed in can take several weeks, and quality can vary depending on which team you’re assigned.

memoryblue strengths: genuinely skilled callers, a training pipeline built around live conversation, and an approach that tends to hold up well when your audience doesn’t respond to email at the volume needed to hit pipeline targets. For industries where a phone conversation with a real, informed person still moves deals forward, this is a meaningful edge.

memoryblue limitations: cold calling is harder to scale predictably than email sequencing, results are more dependent on individual rep skill and script quality, and if your buyer persona genuinely prefers async, low-pressure first touches, a phone-first motion can create friction rather than remove it. It’s also a narrower specialization: if you need heavy multichannel orchestration as the primary motion, it may feel less native to how they operate.

Neither agency is bad. The mismatch risk isn’t “one of these is worse,” it’s “one of these doesn’t match how your specific buyer wants to be approached.”

Pricing model, at a high level

Both operate on a retainer model rather than pure performance-based (pay-per-meeting) pricing. You’re typically paying a monthly fee for a dedicated team’s time and activity (calls made, emails sent, campaigns run), not a fixed price per qualified meeting delivered. That means your cost is roughly fixed regardless of how many meetings actually land in a given month, and the burden of managing performance falls on you as the client, tracking whether the retainer is converting into a pipeline you actually want.

Contract terms usually run three to six months minimum, since building and refining messaging, targeting, and rep familiarity with your offering takes real ramp time. Get exact current pricing directly from each company, as it varies by scope, seniority of reps assigned, and channel mix.

Which team each one fits

Belkins tends to fit teams that want a systemized, multichannel outbound motion resembling what a strong in-house SDR function would run, and that have a SaaS or tech-adjacent offer where email and LinkedIn sequencing convert well.

memoryblue tends to fit teams selling into markets where live phone conversation is still the highest-converting first touch, especially enterprise software, complex B2B services, and traditionally phone-responsive verticals.

Both fit teams that have the internal bandwidth to manage a retainer relationship: reviewing messaging, giving feedback on call recordings or email copy, and holding the agency accountable to activity and pipeline metrics over a multi-month ramp.

When a pay-per-meeting model fits better

If you’d rather not manage a retainer, tune messaging over months, or carry the risk of paying for activity instead of outcomes, a pay-per-meeting service is worth a look. Nurturance runs outbound for FinTech and InsurTech companies using real human callers through the Glencoco marketplace in the US and UK, and you only pay for meetings that actually land on the calendar. It’s a fit for teams that want qualified pipeline without owning the agency relationship itself.