Oto vs ElevenLabs
Side-by-side comparison of AI visibility scores, market position, and capabilities
London digital CBT app for tinnitus with DEFINE Trial evidence showing 86% benefit in one month; £2.8M seed competing with Widex and ReSound for 750M global tinnitus sufferers needing accessible specialist care.
About
Oto is a London-based digital health company providing clinically validated, app-based CBT (cognitive behavioral therapy) treatment for tinnitus — the persistent ringing, buzzing, or hissing in the ears that affects 15% of the global population (750 million+ people) with no pharmaceutical cure — delivering structured therapeutic programs designed by tinnitus specialists that help patients manage and reduce tinnitus distress through evidence-based psychological and sound therapy techniques. Founded and backed with £2.8 million in seed funding raised in 2022, Oto demonstrated in the DEFINE Trial (the largest randomized controlled trial for any digital tinnitus program) that 86% of users experience measurable benefits within one month of the program.
$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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