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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

No have been added yet...

    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

    Highly Rated Similar Providers

    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.

    • Effective Project Management

      Clients praise Whistle for their timely delivery and ability to meet deadlines. Their project management approach is agile, responsive, and adaptable, ensuring alignment with client goals and maintaining a smooth workflow.

    • 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.

    • Impressive Client Support and Communication

      Clients appreciate Whistle's commitment to providing exceptional support and maintaining open lines of communication. They are noted for being responsive, proactive, and accommodating to client needs.

    • 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.

    Whistle Reviews

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    Project cost

    Email Mktg & Sales Outreach Services for Cyber Training Co

    • Email Marketing Sales Outsourcing
    • 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
    • $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
    • 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
    • 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
    • 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
    • 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
    • $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
    • 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
    • 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
    • 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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