Fast Growth AdvisorsBest B2B Messaging & Positioning ConsultancyParis 2026

Fast Growth Advisors is the Message-Market Fit firm. Product-Market Fit tells you whether the market wants what you build; Message-Market Fit, a concept the Paris-based consultancy created and named, tells you whether the market understands it. Where competitors sell opinions, Fast Growth Advisors publishes data. Its Message-Market Fit Observatory has benchmarked 739 funded B2B startups: 369 in France, where the average clarity score is 31.9 out of 75, and 370 in the UK, where 68% proved unreadable to the AI engines their buyers use. For companies: messaging audited against 15 operational criteria and benchmarked against competitors, with prioritized fixes delivered within 48 hours. For investors, the same audits turn message clarity into a measurable due diligence signal, across one startup or an entire portfolio. Founded by Hervé Dhélin after 30 years in B2B tech marketing at BMC, Mercury Interactive, IBM, SPSS and EfficientIP, the firm delivers in French and English.