Belkins Alternatives for B2B Lead Generation: 5 Agencies Compared

Why people search for a Belkins alternative

I'm Hlib Storchak. I build and run outbound systems for B2B founders and sales teams, and I've booked 2000+ meetings for B2B clients doing it. I've already written a full head-to-head on Belkins vs CIENCE, and people keep asking me some version of the same follow-up question: fine, but what else is actually out there. Usually it's one of three things driving the search. Belkins' minimum spend or contract length doesn't fit the budget. The buyer wants a second or third quote to sanity-check a proposal. Or Belkins is already a client and the account isn't performing, and they want to know what a switch would actually look like before they commit to one.

This isn't a "10 alternatives" list padded with names I haven't actually checked. I picked five agencies that are genuinely comparable on the thing Belkins sells, appointment setting and SDR-as-a-service for B2B teams, and that differ from each other in a way that matters: platform-bundled vs pure service, US-only vs global, and premium vs budget. If none of these five fit, the honest next step is building the ICP and offer in-house first, which I cover in when hiring an outbound agency is the wrong call.

A disclosure before the comparison

I run a done-for-you outbound practice, which makes me a direct competitor to every agency in this article, including Belkins. I'm not on anyone's affiliate program and I have no financial relationship with any of the five. My aim is the same one I use for every agency piece on this blog: real strength, real limitation, and an honest read on fit, not a hit piece and not a favor to anyone. Take the ranking below as one operator's read, and go verify the specifics against each agency's own current pages before you sign anything, since Clutch numbers and pricing pages change.

What Belkins actually is, as the baseline

Belkins positions itself as an omnichannel outbound agency: cold email, LinkedIn, SMS and voicemail touches, plus appointment setting and SDR services layered with lead research, copywriting, deliverability consulting, and HubSpot CRM support. Its own site claims experience across "50+ B2B industries" and it doesn't publish specific pricing, directing prospects to a custom quote instead. On Clutch, Belkins carries a 4.9/5 average across 233 verified reviews, with its most common project size sitting in the $10,000 to $49,000 band based on 175 of those reviews, and select services like account-based marketing and marketing strategy running $50,000 to $199,999.

That combination, a wide channel mix, a large verified review base, and a premium project size, is the bar the five alternatives below are actually being measured against. None of them beat Belkins on every axis. Each one wins on a specific axis that might matter more to your situation than Belkins' overall polish does.

The five alternatives, at a glance

I checked CIENCE's Clutch and pricing figures directly for the dedicated Belkins vs CIENCE comparison, which still holds, so I've kept its section here short and pointed you to that piece for the full breakdown rather than repeating it.

CIENCE: the platform-plus-managed-service option

CIENCE's pitch is different from a pure staffing agency: it bundles its own graph8 data and intent platform into the retainer, and per graph8's own pages you can run that platform yourself, build on its infrastructure, or hand the whole thing to CIENCE's managed SDR service. On Clutch it carries a 4.2/5 rating across 142 verified reviews, a notch below Belkins' 4.9/5, though its own comparison materials frame that gap as a tradeoff for the platform depth rather than a service-quality issue.

Real strength: the data platform is genuinely separable from the retainer if you want to build on it yourself later, which none of the other four alternatives here offer. Real limitation: a materially lower Clutch score than Belkins or SalesRoads, and I've covered the specific self-graded-tier concerns with graph8 in how much to trust a talent marketplace's own quality tiers.

SalesRoads: US-based dialing and appointment setting

SalesRoads, founded in 2007 and based in Boca Raton, Florida, leans hard into phone-first outbound delivered by reps it describes as 100% US-based, most with 5 to 10 years of outbound experience. Its own Clutch profile splits services roughly evenly between B2B appointment setting and B2B lead generation, and it carries a 4.9/5 rating across 66 verified reviews, matching Belkins' star rating on a much smaller review base. Its most common project size on Clutch runs $50,000 to $199,999 based on 49 reviews, which is a materially higher band than Belkins' typical project.

Real strength: if your ICP actually answers the phone, a dialing-heavy shop with a decade-plus average rep tenure claim is a real point of difference from an email-first agency. Real limitation: the disclosed Clutch project-size band skews larger than Belkins', so it isn't obviously the cheaper option it sometimes gets pitched as, and it doesn't publish the same multichannel LinkedIn and SMS mix Belkins does.

Martal Group: blended AI and human sales executives

Martal, in business 15 years by its own account, runs a hybrid model: what it calls a proprietary AI outreach system handling prospecting, copywriting, and sequencing, paired with human sales executives who work qualification and deal progression. Its own site states 200+ onshore sales executives split roughly 60% US, 20% Canada, 10% EU, and 10% LATAM, which is a materially wider geographic spread than SalesRoads' US-only claim. On Clutch it holds a 4.8/5 rating across 109 reviews, and its most common project size, $10,000 to $49,000 based on 86 reviews, sits closer to Belkins' band than SalesRoads' does, with sales-outsourcing packages starting around $4,500/month by its own listing.

Real strength: the lower stated monthly entry point and broader geography make it a reasonable fit for a team that wants international coverage without Belkins' typical project size. Real limitation: the AI-plus-human blend means you're trusting a proprietary system you can't inspect the internals of, the same due-diligence question I'd raise about any vendor's "proprietary platform" pitch.

Callbox: global reach with a bundled data platform

Callbox operates across what its own site calls 60+ countries with regional teams in North America, Asia-Pacific, Latin America, and Europe, layering phone, email, LinkedIn, and digital engagement under one subscription-based, custom-scoped model. It bundles a proprietary Smart Engage AI platform for account-based targeting and sequencing, with data sourced through what it describes as a multi-source waterfall across ZoomInfo, Lusha, and Apollo. On Clutch it carries a 4.6/5 rating across 123 verified reviews, with a most-common project size of $10,000 to $49,999 based on 101 reviews, close to Belkins' own band.

Real strength: genuinely the widest geographic footprint of the five, which matters if your target accounts are spread across multiple continents and time zones. Real limitation: like CIENCE's graph8, Smart Engage is a bundled proprietary platform, not an independently audited one, so the same portability questions I'd ask CIENCE apply here too. I've written about this exact pattern, a bundled AI or data platform inside an agency retainer, in when a bundled data platform is worth it.

Cleverly: the budget, LinkedIn-first option

Cleverly is the outlier on this list by scale and price point. It's a done-for-you agency built around LinkedIn outreach first, with cold email and cold calling offered alongside it, and it markets itself around a high review volume, over 1,000 five-star reviews by its own count. On Clutch specifically it holds a more modest 4.2/5 across 84 verified reviews, and its most common project size is under $10,000 based on 70 reviews, with lead-generation engagements typically landing between $2,800 and $10,000 per its Clutch cost data. That's a full order of magnitude below Belkins', SalesRoads', and Callbox's typical bands.

Real strength: it's the only agency here priced for a founder or small team testing outbound for the first time without a $10,000+ monthly commitment. Real limitation: the Clutch rating is the lowest of the five, and a channel-specific, lower-touch package is a different product than Belkins' full omnichannel build, not a cheaper version of the same thing.

Reading a retainer quote against Clutch's own numbers

None of these agencies publish a flat price, so the only honest way to sanity-check a quote is against the ranges their own Clutch profiles disclose, treated as a range, not a promise. Here's the model I'd actually run, with every input labeled as an assumption you should swap for your own: say you're quoted $6,000/month on a 3-month minimum with a $4,000 setup fee, a shape that's common across mid-market retainers per LeadRiver's 2026 benchmark. That's $22,000 for the initial term. Compare that total against the agency's own disclosed "most common project size" band on Clutch: if $22,000 lands well above SalesRoads' $50,000–$199,999 band, you're likely being quoted for a lighter-scope engagement than SalesRoads typically runs, worth clarifying before you sign. If it lands inside Martal's or Callbox's $10,000–$49,000-ish bands, it's roughly in line with what other buyers report paying for a comparable scope. This won't tell you if the work will be any good. It will tell you if the number in front of you is priced like everyone else's deal with that agency or like an outlier, and an outlier in either direction is worth a direct question before you sign.

Who each one actually fits, and when I'd be the wrong choice

Stick with Belkins if you want the widest verified review base and a genuinely omnichannel build without managing multiple vendors. Look at CIENCE or Callbox if a bundled data and intent platform is worth more to you than the extra Clutch review volume, and you're comfortable with a platform you can't fully audit. Look at SalesRoads if your buyers actually pick up the phone and you're funded for a $50,000+ engagement. Look at Martal Group if you need coverage across the US, Canada, Europe, and Latin America without Belkins' typical project size. Look at Cleverly if you're testing outbound for the first time on a budget under $10,000 and LinkedIn is your primary channel.

This is also the point where I'd be honest about when I'd be the wrong choice too: if what you actually need is a single agency that owns the whole build and you don't want a client-side owner reviewing the work weekly, several of the agencies above, and I, will still ask you to stay involved. If you want a fully hands-off vendor, none of the six options in this article, mine included, are the right fit until that expectation changes. The mistake I see most often when a prospect is choosing between agencies like these is picking on the review count or the logo alone rather than the pricing shape and channel mix that actually matches how their buyers behave.

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