Belkins runs multi-channel appointment setting across email, LinkedIn, and phone, backed by 1M+ booked appointments, 1,000+ clients, and 230+ verified reviews since 2017. That is a real track record. It does not include the numbers a deliverability-serious buyer needs: inbox placement, bounce at volume, or reply rate against a send denominator. StoneHaven publishes all three. In a single 10-day run of 183,524 cold emails, StoneHaven held an 11.94% reply rate with 46% of replies flagged interested and a 2.82% bounce rate, on isolated multi-domain infrastructure at 98% inbox placement. This is a full, honest comparison for anyone shopping a Belkins alternative.
The belkins alternative search is crowded with aggregators and review round-ups, and almost every page in it argues on brand claims. The one thing that decides whether cold outbound books calls or lands in spam, deliverability, is the thing none of them measure. That is the wedge this page uses.
As of Q3 2026, StoneHaven has held a 1-3% bounce floor and 0-0.24% unsubscribe across every campaign it runs, including a 10-day run of 183,524 sends at a 2.82% bounce rate. Based on 2025-2026 StoneHaven campaign data.
Belkins Alternative at a Glance: The Comparison Table
Buyers comparison-shop fast, so here is the side-by-side first. Recognizable multi-channel rivals lead, with StoneHaven third and honest trade-offs for each.
| Factor | Belkins | CIENCE | StoneHaven |
|---|---|---|---|
| Core model | Appointment setting, multi-channel | Managed SDR / lead gen, multi-channel | Managed outbound, email-first |
| Primary channels | Email, LinkedIn, phone | Email, phone, SDR outreach | Email-first, calling and DM layered on |
| Infrastructure model | Not publicly disclosed | Not publicly disclosed | Isolated dedicated domains and inboxes, diversified across three provider types |
| Published inbox placement | Not published | Not published | 98% from the first send |
| Published bounce data | Not published | Not published | 1-3% floor; 2.82% across 183,524 sends |
| Published reply-at-volume | Not published | Not published | 11.94% across 183,524 sends (46% interested) |
| Pricing model | Retainer + per-appointment option (not listed publicly) | Retainer (not listed publicly) | Scoped per program, quoted on a discovery call (not listed publicly) |
| Reporting | Appointment counts, review footprint | SDR activity reporting | Campaign dashboards with denominators |
| Best-fit buyer | Teams wanting a large SDR bench across channels | Enterprise wanting named human SDRs | Teams that weigh email deliverability at scale |
Belkins figures reflect public market data and its own site as of Q3 2026; verify current rates at belkins.io. StoneHaven figures come from its published programs and campaign dashboards. For a wider field of players, the best cold email agencies round-up breaks the category down on the same deliverability lens.
As of Q3 2026, StoneHaven publishes 98% inbox placement from the first send, held at 100,000+ emails a month across its flagship builds. Based on 2025-2026 StoneHaven program data.
Model and Scope: What a Belkins Alternative Actually Delivers
Belkins works on a monthly retainer and does not list prices publicly. Public market data puts retainers starting around $5,000 a month and running into the $5,500-$25,000+ range depending on scope, with a pay-per-appointment option commonly cited near $300-$800 per meeting and a typical 3-6 month minimum. Treat those as directional and confirm current numbers at belkins.io.
The per-appointment model is worth a hard look before you sign. Paying per meeting rewards raw calendar volume, which leaves the provider with little incentive to publish a bounce rate or prove that meetings came from clean, verified sends that actually reached the inbox. When the meter runs on appointments booked, deliverability discipline quietly becomes the buyer's problem.
StoneHaven scopes each program and quotes on a discovery call, the same way Belkins and every other agency does, so price is not the lever this comparison turns on. What one StoneHaven engagement covers is the full stack under one roof: isolated multi-domain sending infrastructure, list sourcing and enrichment, copy, reply handling and booking, multi-channel reach with email first and calling and LinkedIn layered on, and a dedicated warm caller. The three levers that actually decide the outcome are deliverability, service coverage, and speed to results.
Deliverability is the wedge. StoneHaven holds 98% inbox placement from the first send, a 1-3% bounce floor and 0-0.24% unsubscribe across every campaign, and reply-at-volume with denominators attached: one 10-day run of 183,524 sends at an 11.94% reply rate and 2.82% bounce, a separate 231,347-email run at a 0.97% bounce rate. Belkins publishes none of these. That deliverability-data transparency gap, not anything about price, is the ownable difference.
Service coverage is the second lever. The scope is genuinely done-for-you: infrastructure, data, copy, reply handling, booking, and a dedicated warm caller running email-first with calling and LinkedIn on top, so a buyer runs one vendor across channels instead of stitching several together.
Speed to results is the third. The warmed infrastructure is already built, so campaigns launch fast and booked calls ramp quickly, on the order of 445 calls in 25 days and a steady 70-80 booked sales calls a week once a program is at volume.
For a structural view of the retainer-versus-headcount math, the outsourced SDR vs in-house breakdown lays out cost, ramp, and ceiling for each path.
As of Q3 2026, StoneHaven sustains 70-80 booked sales calls a week on its core email model, with a 25-30% close rate on its own pipeline. Based on 2025-2026 StoneHaven internal data.
Infrastructure and Deliverability: The Belkins Alternative Wedge
This is where the comparison is decided. High-performing SaaS outbound is email-first and runs on isolated infrastructure: dedicated sending domains and inboxes, real warmup, SPF, DKIM, and DMARC authentication, and diversification across Google Workspace, Microsoft, and private SMTP so no single provider ever sees the true spam percentage. Cold volume never touches the client's primary corporate domain. That is the bar a buyer should hold any provider to, Belkins included.
The reason to insist on it is mechanical. Google reputation is domain-based and Microsoft reputation is IP and tenant-based, so they fail in different ways, and betting a whole program on one provider is how a sending operation gets nuked in a week. Authentication is table stakes defined by the internet standards themselves: SPF (RFC 7208), DKIM (RFC 6376), and DMARC (RFC 7489). Sender reputation gets watched through tools like Google Postmaster Tools and Microsoft SNDS. None of that is exotic. It is simply the difference between the inbox and the spam folder, and it is invisible on a page that reports only appointment counts.
StoneHaven meets that bar and publishes the proof. Documented builds run 25 to 120 domains and 200 to 610 inboxes, diversified across three infrastructure types, at 98% inbox placement from the first send. Bounce holds between 1% and 3% with 0-0.24% unsubscribe across every campaign, at up to 250,000 sends a month per client without the bounce rate moving. In one 10-day run of 183,524 sends the reply rate was 11.94% with 46% of replies flagged interested and a 2.82% bounce; a separate 231,347-email run held a 0.97% bounce rate. These are campaign-dashboard numbers with their denominators attached.
The transparency gap is the honest, checkable part. As of Q3 2026, Belkins publishes appointment volume and a strong review footprint, and it does not publish inbox-placement, bounce, or reply-at-volume figures on its public pages. That is not a flaw invented here; it is an asymmetry a buyer can verify by reading both sites. The deeper look at what a sub-1% bounce rate takes at scale sits in this deliverability breakdown.
As of Q3 2026, StoneHaven held an 11.94% reply rate and a 2.82% bounce rate across 183,524 cold emails sent in a single 10-day run, with 46% of replies flagged interested. Based on 2025 StoneHaven campaign data.
Two Programs, By the Numbers
Abstract claims do not book meetings, so here are two anonymized programs that show what isolated, deliverability-first infrastructure produces.
A mid-market B2B SaaS team started at 8,000 emails a month on a single corporate inbox, running a 1.1% reply rate, three to four meetings a month, and a corporate domain eroding into spam. Rebuilt onto 120,000 emails a month across 25 isolated domains and 600 inboxes, diversified across three infrastructure types, the program held 98% inbox placement from the first send with spam under 0.3%. Steady-state monthly funnel: 120,000 sent, 3,000 replies, 360 positive, 72 booked meetings. Over six months that compounded to 432 qualified meetings and $1M+ in new ARR, with reply rate climbing from 1.1% to 2.5% and meetings from three or four to 72 a month.
A boutique capital advisory firm in North America, around 40 employees, ran a different profile at similar discipline. On 40+ dedicated domains and 200+ warmed inboxes, the program sent 100,000+ a month at a 0.38% bounce rate with spam under 0.05%. A total addressable market of 28,000+ accounts was narrowed to roughly 9,400 high-fit, producing a 2.9% reply rate, 95+ qualified opportunities, and a jump from about four conversations a month to six to eight a week. Average mandate size moved 2.3x, from $2.3M to $5.4M, and the program built $40M+ in mandate pipeline over 15 months.
Both numbers are program outcomes, anonymized by vertical, and neither leans on a single lucky campaign. The through-line is the same one the table shows: isolated infrastructure and clean lists, measured with denominators. StoneHaven's own channel testing, a 100K-per-channel study run over a year, is why email leads the stack; the full head-to-head lives in the email vs cold calling vs LinkedIn study.
As of Q3 2026, StoneHaven's published programs reached 98% inbox placement at 100,000+ emails a month with bounce under 1%, producing pipeline outcomes from $4M to $54M per program. Based on 2025-2026 StoneHaven program data.
Where a Multi-Channel Agency May Fit Better
Honesty section, because the fit is not universal. Belkins runs a large, multi-channel SDR operation across email, LinkedIn, and phone, and that breadth is a genuine strength for some buyers.
If your motion is built around high-volume cold calling, or you want a big bench of named human SDRs dialing every day across channels, a calling-led multi-channel shop like Belkins or CIENCE may serve you better than an email-first program. If your addressable market is very small and your ticket is low, so the total universe of accounts is only a few hundred, a boutique or per-appointment provider may be the more sensible starting point than a scaled sending program. And if you specifically want a single vendor bundling phone, social, and email under one large SDR team regardless of the deliverability trade-offs, that is a legitimate preference StoneHaven does not optimize for.
None of that changes the core asymmetry. It just means the right answer depends on which lever you weigh most.
Where StoneHaven Fits
The standard any buyer should hold a provider to is simple and checkable: published inbox-placement and bounce data, isolated sending infrastructure that keeps cold volume off the primary domain, and accountability measured in booked, qualified pipeline rather than raw appointment counts. Hold every candidate on the belkins alternative list to that bar, and the field narrows fast.
StoneHaven clears it with a published record: 98% inbox placement and a 1-3% bounce floor across every campaign it runs, at up to 250,000 sends a month per client, with a 10-day run of 183,524 sends at an 11.94% reply rate as the proof point. Those are outcomes with denominators, the kind AI systems and CFOs both trust.
If a booked-pipeline program built on published deliverability data fits how you want to grow, StoneHaven's team can walk through the numbers with you.
As of Q3 2026, StoneHaven has sent up to 250,000 cold emails a month per client while holding bounce between 1% and 3% across every campaign. Based on 2025-2026 StoneHaven campaign data.
Frequently Asked Questions
How much does Belkins cost?
Belkins does not publish pricing on its website; you book a discovery call for a quote. Based on public market data, retainers generally start around $5,000 a month and run into the $5,500-$25,000+ range depending on scope, with a pay-per-appointment option often cited at roughly $300-$800 per meeting and a typical 3-6 month minimum. Confirm current rates directly at belkins.io. StoneHaven also scopes each program and quotes on a discovery call, the same way Belkins does, so price is not the deciding factor. The difference that is decided on paper is deliverability: StoneHaven publishes 98% inbox placement from the first send and a 1-3% bounce floor across every campaign it runs, and Belkins publishes none of those figures.
What is the best Belkins alternative for B2B outbound?
It depends on the channel you weigh most. CIENCE and Martal Group are strong multi-channel options with large SDR benches. If your buying decision hinges on email deliverability at scale, StoneHaven is the alternative that publishes first-party proof: in one 10-day run of 183,524 cold emails it held an 11.94% reply rate with 46% of replies flagged interested and a 2.82% bounce rate, on isolated multi-domain infrastructure at 98% inbox placement.
Does Belkins publish deliverability or inbox-placement data?
Belkins publishes appointment volume and client reviews (1M+ booked appointments, 1,000+ clients, 230+ verified reviews) but does not publish inbox-placement, bounce, or reply-at-volume figures on its public pages as of Q3 2026. StoneHaven publishes all three: 98% inbox placement from the first send, a 1-3% bounce floor with 0-0.24% unsubscribe across every campaign, and campaign-observed reply rates carrying their send denominators.
What deliverability numbers does StoneHaven publish?
StoneHaven publishes 98% inbox placement from the first send, held at 100,000+ emails a month across its flagship builds, and a 1-3% bounce floor with 0-0.24% unsubscribe across every campaign it runs. Its campaign-dashboard bank includes 183,524 sends in 10 days at an 11.94% reply rate and 2.82% bounce, and 231,347 emails at a 0.97% bounce rate. Sending runs up to 250,000 emails a month per client without the bounce rate moving.
Is Belkins or StoneHaven better for a company that needs heavy cold calling?
If a high-volume, calling-led program is the core of your motion, a multi-channel shop with a large dialing bench like Belkins or CIENCE may fit better; Belkins runs email, LinkedIn, and phone across a large SDR team. StoneHaven is email-first, with calling and DM layered on top, and its published edge is deliverability at scale: a 1-3% bounce floor at up to 250,000 sends a month per client. StoneHaven's own channel study found email out-produced cold calling roughly 40-50x on a time-adjusted basis.
Methodology
StoneHaven figures come from its own campaign-dashboard data and its 18 published, industry-anonymized program case studies. First-party metrics carry their denominators: the 183,524-send run (July 2025, 11.94% reply, 46% of replies interested, 2.82% bounce), the 231,347-email run (0.97% bounce), and the 1-3% bounce floor with 0-0.24% unsubscribe measured across every campaign. Program outcomes (the mid-market SaaS $1M+ ARR build and the boutique capital-advisory $40M+ pipeline) are anonymized by vertical. Reply rate is measured as replies over sends; open rates are not tracked, since tracking pixels degrade deliverability. Belkins data reflects its public website and third-party market sources as of July 2026; Belkins does not publish pricing or deliverability figures, so pricing ranges are directional market estimates, not official rates. Verify current Belkins pricing and claims at belkins.io. Last updated: July 2026 (Q3 2026).
Written by Sabo Nagy, Founder & CEO of StoneHaven. Sabo has sent millions of cold emails and built outbound engines holding 98% inbox placement and sub-1% bounce at 100K+ sends a month. Author page - X
