London-based voice biometrics and deepfake detection startup Voxmind, has closed a £546,491 pre-seed round led by Ascension Ventures. The round also includes participation from Mark McDermott (co-founder of ScreenCloud), lead angel Russell Hart, and members of the Cambridge angel network.
The funding arrives at a structural inflection point in enterprise authentication.
Microsoft retired Azure Speaker Recognition in September 2025 and AWS ends support for Voice ID in May 2026, two of the three major cloud providers have now exited voice biometrics. The hardware OEMs, contact centre operators, and enterprises that relied on those services are now without a long-term authentication layer, precisely as deepfake voice fraud accelerates against financial services, telecoms, and enterprise voice channels.
Founded in January 2024, the company has developed a patent-pending phoneme-frequency extraction engine that analyses the biomechanics of the human vocal tract, physical signal characteristics governed by anatomy, not language.
The result is voice authentication and deepfake detection that works across all languages by design, achieves 99.8 per cent deepfake detection accuracy in under 3 seconds, and runs in under 500MB of runtime memory with no GPU or cloud connectivity required.
The architecture supports three deployment models out of the box:
- On-device OEM SDK for hardware manufacturers.
- Platform-native integration for CCaaS and UCaaS operators via WebSocket, gRPC, SIP/SIPREC, and AudioHook.
- Cloud API for enterprise and fintech deployments.
According to Jai Keerthi, founder and CEO of Voxmind, every major enterprise that relies on cloud voice APIs is now exposed precisely as AI voice fraud accelerates.
“We built for this architecture before the gap existed, physics-based, on-device, deployable anywhere. Now we just need to fill it.”
The company has already signed an OEM agreement with a major unified communications hardware provider, embedding its voice biometric SDK directly into enterprise IP phone hardware. Additional commercial pipeline spans community banking in the US, telecoms in Europe, and strategic partnership conversations across global IT services and contact centre operators.
Toyosi Ogedengbe, Principal, Ascension Ventures, shared:
“Voice is the last unencrypted frontier in enterprise security, and generative AI just made the stakes existential. Voxmind’s physics-based approach, on-device deployment, and existing OEM footprint give them a structural advantage that’s very difficult to replicate.”
The pre-seed capital will be deployed across commercial sales into financial services, telecoms, and contact centre operators; model optimisation for edge deployment; and ISO 27001 certification on an eight-month delivery timeline.