Callyope vs ElevenLabs
Side-by-side comparison of AI visibility scores, market position, and capabilities
Callyope (Paris, AWS Pioneers 2026) raised .41M seed with 8 clinical trials ongoing, using speech AI to detect psychiatric deterioration early and deliver objective data between visits.
About
Callyope is a Paris-based clinical AI company founded to improve outcomes in mental health through passive, continuous monitoring. The company applies speech analysis and machine learning to detect early signals of psychiatric deterioration, enabling clinicians to intervene before crises occur. Its core technology processes vocal biomarkers to track mood, cognition, and behavioral patterns over time without requiring patients to self-report symptoms.\n\nCallyope's platform is designed for integration within clinical workflows, targeting psychiatrists, mental health hospitals, and digital health providers. The product supports remote patient monitoring between visits, generating objective data streams that augment clinician judgment. Unlike consumer wellness apps, Callyope operates within regulated clinical environments and is built to meet the evidentiary standards required for reimbursement and adoption in European and US health systems.\n\nThe company raised a $2.41 million seed round to fund product development and clinical validation. It currently has eight clinical trials ongoing and was selected for the AWS Healthcare Accelerator Pioneers 2026 cohort, reflecting recognition of its technical and scientific rigor. Callyope's pipeline of trial data positions it to pursue regulatory clearance and reimbursement pathways, which would unlock hospital procurement and enterprise mental health contracts at scale.
$500M Series D at $11B valuation (Feb 2026) — largest voice AI funding round ever. $330M ARR; 1M+ developers using the API. Enterprise customers: Deutsche Telekom, Revolut, Meta, Salesforce. Voices in 32 languages; real-time cloning from 1 second of audio.
About
ElevenLabs was founded in 2022 by Piotr Dabkowski and Mati Staniszewski, two former Google and Palantir engineers who set out to break the language barrier using AI voice technology. The company specializes in AI-powered voice synthesis, cloning, and dubbing, enabling developers and enterprises to generate human-quality speech in over 30 languages. Its core technology combines deep learning models trained on massive speech datasets to produce natural-sounding voices indistinguishable from real humans.\n\nElevenLabs offers a suite of products including its flagship text-to-speech API, voice cloning tools, and an AI dubbing platform that localizes video content while preserving the speaker's original voice. Its products target a broad audience—from indie developers building audio apps to large enterprises deploying voice interfaces at scale. Key differentiators include ultra-low latency streaming synthesis, fine-grained voice customization, and a growing library of pre-built AI voices across accents and styles.\n\nElevenLabs has grown rapidly, surpassing $330M in annualized revenue and serving over 1 million developers. Enterprise clients include Deutsche Telekom, Spotify, and leading media companies. In February 2026, the company closed a $500M Series D at an $11B valuation, cementing its position as the market leader in AI voice. Its APIs power podcasts, audiobooks, video games, and customer service bots worldwide, making ElevenLabs the default infrastructure layer for AI-generated audio.
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