Out2Bound vs Whistle Ltd

A head-to-head comparison of Out2Bound and Whistle Ltd in sdr agencies, scored across the same 5 weighted criteria so you can see exactly where each agency is stronger.

Out2Bound

B2B sales development and outsourcing support for technology companies.

55/ 100 overall

Whistle Ltd

B2B lead generation and outsourced SDR services for fast-growing companies.

69/ 100 overallHigher score

Score-by-score

Criterion	Out2Bound	Whistle Ltd
Website Presence(20%)	34	82
Search Visibility(20%)	42	40
Trust & Credibility(20%)	72	78
Market Presence(15%)	58	62
Customer Satisfaction(10%)	84	90
Overall	55	69

Pricing at a glance

Out2Bound

Model: Primarily hourly, delivered as an outsourced outbound sales / lead generation engagement; third-party comparisons also describe it as an hourly or project-based retainer. The agency site itself does not publish prices and appears to have been redirected to MarketStar after acquisition.
Typical range: $50-$99/hr

Full Out2Bound pricing →

Whistle Ltd

Model: Custom-quoted outsourced SDR / appointment-setting engagements. The evidence points to a monthly service model for fully managed outbound SDR programs, plus a flexible staffing-style "Hire SDRs" offer; Whistle itself says pricing varies by scope depending on whether you hire SDRs, run full-service outbound, or need RevOps support.
Typical range: $5,000-$10,000+ / month

Full Whistle Ltd pricing →

Out2Bound profile →Whistle Ltd profile →← All sdr agencies