Tagline
Your buyers are lying to you. Politely
At Diffly, we're building the best solution for uncovering what your prospects and customers actually say, when you're not in the room..
Our mission: provide a neutral, clear-eyed read on your business to understand the "why" behind every key decision - won or lost deal, customer churn, commercial success
They trust us
With Diffly, we’ve not only improved our sales efficiency but also instilled a data-driven culture within our teams. The insights generated are now at the heart of our decision-making, whether in sales, marketing, or product development. It’s a real game-changer for our company.
Pierre Leroux
CEO @Lemon Learning
Diffly is a simple setup for a 10X ROI! Thanks to Diffly, we not only increased our conversion rate, but we also gained a much better understanding of our competitors and how we can differentiate ourselves in complex markets. Diffly's AI platform has become a key strategic partner for us. It is the single source of truth to fuel our battle cards and confirm or refute strategic, product, and positioning directions.
Raphaël Boukris
CRO & Co-Founder @Didomi
Before Diffly, we had ideas about what worked and what didn’t, but nothing tangible to support our decisions. This allowed me to deliver some very strong messages internally, and it helped the teams become aware of things they hadn’t even considered.
Hugues Peuchot
Co-founder & CEO @Skillup
This isn't a data problem. It's a trust problem.
When a prospect chooses a competitor, they'll tell you it was the price. When a customer churns, they'll say the timing wasn't right. It's not a lie, it's just diplomacy. The truth stays with them.
90% of loss reasons logged in CRMs are inaccurate. (Gartner) Not because teams are doing a bad job, but because buyers don't tell them everything.
Your CRM records what happened. Your call recorder captures what was said. Diffly reveals why the decision was made.
Diffly is the strategic control tower for revenue leaders.
We help C-level executives run their business with action plans grounded in factual, reliable, consolidated insights — drawn from every prospect and customer interaction.
The origin
Why we built this
Julien, Anne-Sophie, and David had already built two companies together: Javelo, an HR solution, and Multiposting, a talent acquisition platform. Each time, they observed the same pattern: B2B companies lose an average of 80% of their deals without knowing why. And the 20% they win, they don't really understand either, too busy celebrating the signature.
This kept coming back to haunt them: entire sales and marketing teams mobilized to feed a pipeline that doesn't convert, based on assumptions that were never validated.
At some point, the question became impossible to ignore: what if we stopped guessing, and just asked the buyers directly?
They discovered that the best B2B companies already had a name for this practice: win-loss analysis. Powerful, but nearly impossible to scale with internal resources. So they built what was missing: a solution to make this process accessible to every revenue team. Diffly was born in 2023.
Diffly captures, cross-references, and analyzes signals from multiple sources (interviews, surveys, call recordings, emails, CRM) to identify confirmed trends, not isolated signals.
Diffly acts as a radar that detect what's emerging, what's deteriorating, and what needs immediate action.
What we do
Platform + experts.
Data + human.
Diffly combines a buyer intelligence platform with interviews conducted by independent experts. Every deal - won, lost, renewed, churned - becomes a structured source of learning, directly actionable inside your tools.
CRM
Records what happened.
Diffly
Reveals why the decision was made.
Call recorders
Capture what was said.
Team
The founders
Julien Cohen-Roussey
Co-CEO & co-founder
Ex Chief of staff & Head of Sales at Javelo
David Guillermain
Co-CEO & co-founder
Ex Co-founder & CRO at Javelo (exit PSG Equity in 2022)
Ex Head of Sales at Multiposting (exit SAP in 2016)
Anne-Sophie Vasseur-Clément
Co-founder
Co-founder & CEO at Javelo(exit PSG Equity in 2022)
Ex Lead Product & HR at Multiposting
Guillaume Bandet
CTO & co-founder
Lead Full Stack at Javelo
Lead Full Stack at SAPL
Lead Full Stack at Multiposting
Tagline
Diffly by the numbers
+22%
Average win rate improvement within 7 months
−15%
Average churn reduction within 7 months
48h
To go live after signing
40%
Average response rate on qualitative interviews
100%
Of deals analyzed
150+
B2B companies trust Diffly
Go further
Resources and profiles linked to this use case.
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May 21, 2026 Written by Julien Cohen-Roussey
October 29, 2024 Written by Julien Cohen-Roussey
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October 20, 2025 Written by Julien Cohen-Roussey
