Stop
Guessing,
Start Converting

Based on learnings from over 300 B2B campaigns, our sales pipeline calculator will help you make data-driven decisions in order to squeeze maximum ROI from your current lead sources.

Get Started for Free

Over 350 Companies Trust Whistle

Are You Wasting Time on Low-Quality Leads?

Channel Performance Insights

Instantly visualize which lead sources deliver the highest conversion rates using our built-in B2B pipeline calculator, revealing hidden opportunities and underperforming channels in your current mix.

SDR Capacity Optimization

Match your incoming lead volume to your team's actual bandwidth, ensuring no SDR is overwhelmed while high-potential leads receive the attention they deserve.

Data-Driven Prioritization

Transform raw conversion data into actionable lead rankings using an accurate pipeline value estimator that eliminates guesswork and directs your team's efforts where they'll generate the greatest ROI.

How To Get Started

Achieve your goals with our streamlined process.  We guide you through each step to ensure success.

Step 1:

Input Your SDR Capacity

Step 2:

Add All Your Lead Sources and Financial Goals

Step 3:

View Your Projections via our sales projection calculator and pipeline generation calculator outputs

"For me, working with Whistle freed a lot of time from my hands. Now I can focus on what requires me—meeting the customer and converting opportunities—not driving them. The customer service is very, very good, and the people at Whistle are true professionals. They bring a lot of domain knowledge to the table, and the conversations are always productive and focused on optimizing performance. We’re very happy with the collaboration so far"

Ron Agron

Co-Founder & CEO

Trusted by Growing
Revenue Teams

They Whistled. We Gave Them Pipeline. From early-stage startups to enterprises, our clients share how Whistle changed the game.

“I chose Whistle for the quality of the people. I created a spreadsheet and ranked every candidate I interviewed, and Whistle’s SDRs ranked highest. They were more knowledgeable, more personable, and a little more experienced.”

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Stephan Staszewski

Head of Business Development

"Because they found the right talent, onboarding was incredibly fast, our new team members were actually delivering within less than a month. Whistle’s speed significantly increased our capacity and time-to-market. It was completely seamless, Whistle’s talent fit right in, and the speed at which it all came together was incredible."

Perry Nalevka

CEO at Penguin Strategies

"Whistle provided us with the structure and support we needed to make outbound a viable and repeatable part of our sales strategy. Their team was responsive, collaborative, and proactive in helping us test and learn what worked best for our audience."
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Andrea Brown

VP of Marketing

“Our Whistle team crush their goals every day, every month. They have amazing attitudes and willingness to be part of our team. Love Whistle!!!”
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David Pennington

Sales Development Leader

“We knew the type of talent Whistle had access to, and they exceeded our expectations. Their BDR has helped us expand our pipeline and given us the bandwidth to focus on what we do best—delivering value to our clients.”
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Ari Barmapov

Co-Founder & Head of Business Development

"We chose Whistle because of two things. One, the trust that our network already had in them. Secondarily, it was through the collaboration in the sales process. We felt very well understood and taken care of because we have a unique use case for the outreach. Whistle was able to be flexible, collaborative, and consultative to address our specific needs."

Will Taylor

Co-Founder & Chief Partner Officer

“It’s been an incredibly positive experience working with Whistle. The communication is open and upfront, and I especially appreciate that the Appointment Setters are proactive and confident to test and optimize the process.”
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Connor Conzelman

Former Director of Customer Success

"The Whistle team bring energy, professionalism, and a positive attitude to every meeting. The level of care and commitment is truly impressive. One of our Whistle SDRs was actually awarded the top opportunity contributor worldwide."
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Karleen Hickok

Global Director, Sales Development

"What stands out about Whistle is their flexibility—they built a very specific playbook structured exactly to our needs rather than forcing us into a one-size-fits-all framework."

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Sharon Dayan

VP of Marketing

"Corli is the best BDR I have ever worked with. Ever. EVER. Best stats, initiative, professionalism, calling consistency, and getting it done daily. Thank you Whistle!"
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Tim Savage

Chief Executive Officer

"Whistle provided us with the structure and support we needed to make outbound a viable and repeatable part of our sales strategy. Their team was responsive, collaborative, and proactive in helping us test and learn what worked best for our audience."
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Ron Agron

VP of Marketing

"The people at Whistle are really nice, very warm, and very friendly. It felt like working with colleagues from my own company. Every meeting was just a joy to speak with everyone."
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Donatas Gricius

Head of Marketing | RedK

"Whistle overhauled our pipeline, implemented and streamlined tools around RevOps, and built meaningful reports. This resulted in efficiency gains among the sales team, clean data for analytics, and increased visibility on our sales operations."

Jason Hill

Director of Software Engineering

"What stood out most was the flexibility and ownership. Whistle felt like part of our internal team, not just another agency. They developed the strategy, executed the outreach, optimized everything, and remained responsive throughout.”

Hagai Leeran

Director of Brand Marketing & Strategic Initiatives,

"Whistle helped us transform our sales process from a question mark into a predictable engine for growth. The clarity we gained was a powerful learning experience for our whole team and has been fundamental to our success."

Geeta Verma

Founder at LivedX

"Breaking into the American market is a formidable challenge, but partnering with Whistle made the journey seamless. Their team provided the strategic guidance we needed to navigate every complexity. From the start, they were a dedicated partner committed to ensuring our success."

Avichai Cardozo Tenenbaum

Head of Marketing

“Our inbound strategy with Whistle transformed how we engage with investors. They didn’t just help us set up meetings—they became an extension of our team, building relationships and providing invaluable feedback. The increase in qualified meetings speaks volumes about the effectiveness of their approach.”

Yoni Perry

Investor Relations Director

“The biggest thing is, Whistle helped get our time to market faster. It would have taken us two to three times as long to figure out these things without having fast access to smart people who could talk to customers.”

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Brent Chudoba

Chief Executive Officer

"It's been really great to work with the Whistle team. With no SDR in place, we needed a quick way to start cold-calling prospects, and Whistle was able to step in and deliver in a super quick way."
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Yair Lehrer

VP of Marketing

"Whistle drove those outbound opportunities that enabled us to get in front of our target audience."
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Ellie Abramov

Head of Business Development

"Whistle helped us create a whole new SDR function, which was massive. Their team members were bright, intelligent, and hard working as well. Leads responded to them nicely, with over 800+ meetings scheduled!"
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Orel Levit

Director of Sales

"Great Results and awesome team to work with. Whistle has been amazing in helping us scale our sales operations. The conversion rate of the meetings set is fantastic, and they are always available to help at any time. They are flexible and understand the unique issues of the tech world."
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Dana Roth

Marketing Automation Manager

"Brandon has been a dedicated and valued member of our team. Smart, hard-working, and full of heart. We’re grateful for the impact he’s had, both professionally and personally. He’s a talented remote sales professional - any team would be lucky to have him."
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Aaron Singer

Publisher & CEO

“What stands out for me is Whistle’s professionalism and their communication.”
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Omer Farkash

Co-Founder & COO

“Whistle provided an out-of-the-box solution for sales development, which was exactly what we needed to get up and running quickly. Their team’s ability to pivot strategies and maintain transparency throughout the campaign made them an invaluable partner in helping us grow our business.”
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Jamie Schell

Chief Business Officer

"Whistle’s hands-on approach and availability have been standout features of our partnership. Their team is receptive to feedback, and their flexibility in both strategy and collaboration has been invaluable to our success."
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Matthew Douglas

Global Head of Partnerships and Revenue

"Kirsten was a pleasure to work with, had lots of great ideas, as well as helped me to fine-tune some of the ideas I had in my mind. Everything was done in an incredibly timely fashion, and time and time again, Kirsten went above and beyond. Could not recommend more!"
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Elliot Smus

Director of Sales & GTM

“It’s not just outreach. It’s structured, smart, and really tailored to how our team works. That made a huge difference. Whistle’s like a revenue partner. They brought both strategy and execution and it worked.”

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Hayley Herlitz

Marketing Leader

"This was my first time on HubSpot, and I walked away from our time together with a well-built CRM and a strong understanding and education on how to manage it as we continue to grow and scale. The team was incredibly patient, educational, and a joy to work with."
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Zach Blank

Former GTM Director

"The first thing we noticed was that deadlines were consistently hit, with clear project tracking that made it easy to understand progress and provide feedback. This enabled successful execution across all areas and ultimately achieved our core goals of automating reporting and improving data hygiene across the revenue team, setting us up for scale moving forward."‍‍

Richard Nischk

CEO & Co-Founder

"Working with Whistle for our RevOps has been amazing. We came in a bit nervous for the task at hand, with a large number of specific requirements. Working with Whistle, and specifically with the amazing Sade, was an absolute pleasure. She was incredibly knowledgeable and helped us with many complicated tasks to create an extremely robust CRM system. ‍‍

Sam Rosenblatt

Business Development Manager

“It’s not just outreach. It’s structured, smart, and really tailored to how our team works. That made a huge difference. Whistle’s like a revenue partner. They brought both strategy and execution and it worked.”

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Efrat David

VP of Marketing

Start increasing your sales

Let’s walk you through how we schedule 14,000 meetings a year

Proven success with companies
in your industry

Real world results from companies that partnered with Whistle to generate qualified pipeline faster.

HR and Workforce

How Dot Compliance Scaled Global Pipeline with Whistle

$7.7M

pipeline generated

8X

return on investment

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How Outbound Strategies Secured Success for a New EdTech Concept

$620K

pipeline generated

13X

return on investment

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Improving Inbound Lead Qualification and Meeting Conversion for N2WS

$4.9

pipeline generated

57X

return on investment

Find Out More