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Sales Development Agency

Whistle is a global SDR agency empowering fast-growing companies with operations, teams and strategies to generate sales opportunities.

  • Min project size
    $5,000+
  • Hourly rate
    < $25 / hr
  • Employees
    50 - 249
  • Locations
    Tel Aviv-Yafo, Israel
  • Year founded
    Founded 2018

Overview by:

Reviewer avatar
David Zeff

1 Locations

  • Tel Aviv-Yafo , Israel

Select Focus Area
Industries
Advertising & marketing
20%
Business services
20%
Financial services
20%
Manufacturing
20%
Other industries
20%
Clients
Midmarket ($10M - $1B)
50%
Enterprise (>$1B)
25%
Small Business (<$10M)
25%

Pricing Snapshot

Min. project size $5,000+
Avg. hourly rate < $25 /hr
Rating for cost 4.8 /5

What Clients Have Said

Whistle offers good value for cost, with clients praising their pricing alignment with budgets. They typically work with small teams (2-10 employees) and deliver timely, high-quality outcomes, enhancing lead generation and sales efficiency without significant investment in in-house resources.

This summary is based on verified Clutch reviews.

Most Common Project Size

< $10,000 based on 7 reviews
< $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000

Select a service to see pricing information

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Whistle Review Insights

Overall Review Rating

4.9
  • Quality 4.9
  • Schedule 4.9
  • Cost 4.8
  • Willing to Refer 4.9

Top Mentions

Review Highlights

  • Some Communication and Reporting Improvements Needed

    One client suggested that clearer and more frequent updates on project progress and performance metrics would be beneficial, along with more transparent pricing structures to aid in decision-making.

  • Great Culture Fit and Value for Cost

    Many clients selected Whistle due to their alignment with company values, budget-friendly pricing, and cultural fit. This alignment has contributed to positive working relationships and successful project outcomes.

  • Wide Range of Capabilities

    Whistle offers a diverse set of services, from outbound marketing to CRM implementation and content creation. Clients appreciate their ability to handle various aspects of marketing and sales processes efficiently.

  • Professional and Knowledgeable Team

    Whistle's team is often described as professional, knowledgeable, and capable of exceeding client expectations. Their ability to understand industry-specific needs and deliver tailored solutions is frequently highlighted.

  • Proactive Problem-Solving

    Whistle is recognized for their proactive approach to problem-solving and their ability to go above and beyond to ensure client success. Clients value this dedication and the tangible results it brings.

  • Strong Lead Generation Results

    Whistle consistently delivers high-quality leads and books meetings effectively, as noted by clients across various industries. This has led to increased sales and conversion rates for many clients, showcasing their strength in lead generation and outreach strategies.

Whistle Reviews

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Email Mktg & Sales Outreach Services for Cyber Training Co

  • Email Marketing Sales Outsourcing
  • B2B Appointment Setting
    +2
  • Confidential
  • Oct. 2023 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Our overall experience with Whistle's services has left us satisfied and content."

May 10, 2024
Cyber Business Development Representative, Cyber Training Co
Claire Andrews
Verified
  • Education
  • Israel
  • 11-50 Employees
  • Online Review
  • Verified

A cyber training company has hired Whistle for lead generation services and sales outreach. The team handles outreach through phone, email, and LinkedIn and has established a CRM system. 

Business Consulting for Media Company

  • Business Consulting
  • Big Commerce
    +1
  • $10,000 to $49,999
  • Jan. 2021 - Jan. 2023
3.5
Quality
4.0
Schedule
4.0
Cost
3.5
Willing to Refer
3.5

"What we found most impressive about Whistle was their unwavering commitment to our project's success."

Oct 16, 2023
Department Head, IncNut Digital
Anonymous
Verified
  • Other industries
  • India
  • 501-1,000 Employees
  • Online Review
  • Verified

Whistle was hired by a media company to help scale their global growth. They developed a funding strategy and supported their sales development, global expansion, and innovation efforts.

Email Marketing for Artwork Software Solutions Firm

  • Email Marketing Sales Outsourcing
  • B2B Appointment Setting
    +1
  • Confidential
  • Jan. 2023 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They prioritize their relationship with us as a client."

Aug 29, 2023
Customer Success Manager, Artwork Flow
Reece Sherratt
Verified
  • Advertising & marketing
  • India
  • 201-500 Employees
  • Online Review
  • Verified

Whistle provides email marketing strategy services for an artwork software solutions firm. The team is responsible for inbound and outbound lead generation and email outreach.

Digital Mktg, SMM, SEO & PPC for Software Solution Company

  • Email Marketing Sales Outsourcing
  • B2B Appointment Setting
    +2
  • Confidential
  • May 2023 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0

"They've gone completely out of their way to ensure nothing but success."

Aug 9, 2023
Business Development Specialist, Albiware
Katia Teixeira
Verified
  • Other industries
  • Addison, Illinois
  • 11-50 Employees
  • Online Review
  • Verified

Whistle has developed a digital marketing strategy for an all-in-one software solution company. The team has created a content marketing plan and works on social media, email campaigns, and lead generation.

LinkedIn Outreach for Compliance Software Company

  • Advertising Direct Marketing Marketing Strategy Other Marketing Product Marketing
  • Direct mail
    +2
  • Confidential
  • Nov. 2022 - Ongoing
5.0
Quality
4.0
Schedule
4.0
Cost
4.0
Willing to Refer
5.0

"We've stayed with Whistle for the long period we have, as they go over and above what's required from us."

Apr 17, 2023
Business Development Representative, Dot Compliance
Anonymous
Verified
  • Other industries
  • Tel Aviv, Israel
  • 51-200 Employees
  • Online Review
  • Verified

Whistle provides ongoing digital outreach for a compliance software company. The team is tasked with outbound marketing, LinkedIn lead generation, and appointment setting.

Sales Outsourcing for Cybersecurity Awareness Platform

  • Sales Outsourcing
  • B2B Appointment Setting
    +2
  • Confidential
  • Apr. - Sep. 2025
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Whistle was professional, courteous, punctual, and hardworking."

Oct 1, 2025
COO, Cybersecurity Awareness Platform
Anonymous
Verified
  • Other industries
  • Kanata, Ontario
  • 1-10 Employees
  • Online Review
  • Verified

Whistle handled outbound prospecting for a cybersecurity awareness platform. The team made calls to introduce the client and set up discovery meetings with potential customers.

Lead Generation for Predictive Analytics Company

  • CRM Consulting and SI Call Center Services Sales Outsourcing
  • Other CRM focus
    +2
  • $50,000 to $199,999
  • Mar. 2023 - June 2024
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"The team was professional, agile, and results-oriented."

Jun 4, 2025
Director of Brand Mktg & Strategic Initiatives, Pecan.ai
Hagai Leeran
Verified
  • Other industries
  • Tel Aviv, Israel
  • 51-200 Employees
  • Online Review
  • Verified

Whistle provided marketing strategy and lead generation services for a predictive analytics company. The tasks included creating marketing materials and generating sales-qualified leads.

Lead Generation & Messsaging for Web Dev Co

  • Business Consulting Sales Outsourcing
  • Strategy Development Consulting
    +4
  • Less than $10,000
  • Jan. 2024 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Their services were already optimized for maximum effectiveness and efficiency."

Feb 26, 2025
CEO, Airfleet
Elad Hefetz
  • Advertising & marketing
  • Israel
  • 11-50 Employees
  • Online Review

Whistle provides lead generation services for a web development company. The team crafts messaging for phone, LinkedIn, and email outreach, engages prospects, and handles meetings, QA, and reporting.

CRM Consulting & SI for Electric Vehicle Festival

  • CRM Consulting and SI
  • CRM Customer Support
    +3
  • Less than $10,000
  • Dec. 2024 - Mar. 2025
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"Their team is professional and knowledgeable."

Feb 13, 2025
Head of Sales, Electrify Expo
Jason Hill
Verified
  • Advertising & marketing
  • Spicewood, Texas
  • 11-50 Employees
  • Online Review
  • Verified

Whistle built a HubSpot environment for an electric vehicle festival's sales team. The team also designed custom data reports and configured automation and pipeline workflows.

HubSpot Dev & RevOps Assistance for PropTech Co

  • Sales Outsourcing
  • HubSpot CRM Consulting & Implementation
    +1
  • Confidential
  • Sep. - Nov. 2024
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"It's impressive how attentive to detail they were."

Nov 19, 2024
BD Manager, PropTech Co
Sam Rosenblatt
  • Business services
  • Tel Aviv, Israel
  • 11-50 Employees
  • Online Review

Whistle was hired to build a proptech company's HubSpot from scratch. The team helped the client develop their detailed systems and assisted with their RevOps as well.

Showing 1-10 of 20 Reviews

Our Story

Whistle connects people, to create opportunities.

Here is what makes us unique:

  1. Experienced, skilled, hungry SDRs - matched to best suit our clients' needs.

  2. SDR placement within 5 days, so clients see ROI in record time.
  3. Best Tech Stack & Outreach processes based on success with 300+ Companies.

Our core values:

We win together.
We work with people we like and trust.
We look for the simplest solution first.
We own our desk.
We have each other’s backs.
We have a growth mindset.
We enjoy what we do.

Meet the Team

Yonah Zeff

Yonah ZeffCOO

COO and Co-Founder of Whistle Sales Development Agency - Helping Sales and Marketing Leaders generate more Meetings and more Revenue with Remote SDR’s

David Zeff

David ZeffCEO

Over 10 years of selling technology to hundreds of SMB and Enterprise companies across multiple sectors, sales. I've been a part of 3 exits - one as a founder and two as a founding sales lead.

Locations (1)

Ovadya mi-Bartenura Street Tel Aviv-YafoIsrael

2 - 5

Contact Whistle

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