💡 Pick Belkins for a more specialized, multichannel appointment-setting program.
Belkins is a sales enablement and lead generation company that offers a suite of software tools for B2B companies.
Contact for pricing
Best Callbox Alternatives ranked by AI · updated Aug 2026
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Callbox is a B2B lead generation and appointment-setting service for companies that outsource parts of their sales development process. It combines telemarketing, email outreach, database profiling, and other demand-generation services.
Top 6 Callbox alternatives
2
Martal
Martal
💡 Choose Martal when you need outsourced SDR support focused on technology and B2B sales.
Martal is a B2B lead-generation and sales outsourcing agency serving technology and professional-services companies. It provides prospect research, email and LinkedIn outreach,...
Pros
- Strong fit for technology companies and professional services
- Provides managed sales development rather than only marketing leads
- Can supply fractional SDR capacity without internal hiring
Cons
- Less comprehensive paid-media capability than OpGen Media
- Outbound programs may require longer ramp-up periods
- Custom engagements can be difficult to budget in advance
Custom pricing
💡 Pick CIENCE if detailed prospect research and data-backed outbound execution matter most.
CIENCE is a human-driven and machine-powered managed services for B2B sales, providing lead generation, sales development, and sales research services.
Custom pricing
4
SalesRoads
SalesRoads
💡 Choose SalesRoads for a phone-oriented outsourced SDR team and appointment-setting program.
SalesRoads is a B2B appointment-setting and outsourced sales development provider. It helps companies build prospect lists, run outbound calling and email campaigns,...
Pros
- More established teleprospecting capability than OpGen Media
- Supports both appointment setting and outsourced SDR programs
- Offers campaign reporting and conversation-quality oversight
Cons
- Less emphasis on paid media and content syndication than OpGen Media
- Calling-heavy programs may not fit every audience
- Managed service costs more than running an internal email tool
Custom pricing
5
Leadium
Leadium
💡 Pick Leadium for flexible outsourced SDR support alongside an existing sales team.
Leadium is a B2B sales development agency that builds outbound prospecting and appointment-setting programs. It supports list building, messaging, multichannel outreach, and...
Pros
- Focused outbound specialization can produce faster campaign launches
- Provides list building, messaging, and outreach execution together
- Offers a more targeted alternative to broad demand-generation retainers
Cons
- Smaller paid-media scope than OpGen Media
- Less suitable when inbound content and brand programs are central
- Outbound success depends on accurate targeting and message-market fit
Custom pricing
💡 Choose Apollo if you prefer lower-cost software and want to run outbound campaigns in-house.
Apollo is a sales engagement platform that helps businesses generate more leads and close deals faster.
Starting from $99 per user per month
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