Whistle

Review

★9/10

🇺🇸 New York City, New York·50 - 249 employees·Est. 2020·Reviewed Mar 2026

Global outsourced SDR services built by SaaS sales veterans

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Best For

SaaS startups and scale-ups needing experienced outsourced SDR teams

Hourly Rate

$50-99/hr

In line with the $75/hr median for lead gen agencies in United States

Min. Project

$5,000+

Industries

SaaS, Technology, Fintech

About Whistle

Whistle is a B2B lead generation and outsourced SDR agency founded by brothers David and Yonah Zeff after three successful tech exits spanning a decade in SaaS sales. With a team of over 100 professionals, they support companies targeting every timezone through data research, content marketing, and sales development. Their clients have raised over $2B in funding and generate $16.67M monthly in pipeline from Whistle's SDRs.

Who Whistle Is Best For

SaaS startups and scale-ups needing experienced outsourced SDR teams.

Why Choose Whistle

Founded by 3x tech exit veterans

Global timezone coverage

Strong pipeline generation

Fast ramp-up times

Whistle Services

Outsourced SDRLead GenerationData ResearchContent MarketingSales Development

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