AI testing & review · United States
Human evaluation for text-to-speech with blinded listening studies
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Woodstitch runs blinded paired-preference studies where paid US-based listeners compare text-to-speech systems and return preference rates with confidence
Woodstitch is a platform for human evaluation of speech AI systems. Customers submit audio pairs from their text-to-speech systems through an API, and paid US-based listeners compare them in blinded studies, rating their preferences without seeing system names. Results include win rates with 95% confidence intervals and individual judgement data exported as CSV.
The platform is priced at $18 per hour of audio heard by listeners, with no setup fee or minimum. Studies are quoted exactly before starting through a dry run. Turnaround varies by study size: small studies typically receive first judgements within minutes, and studies of 150–200 judgements complete within 24 hours.
Woodstitch publishes its own listening studies on the same platform under the same rules, including research on which TTS models perform best for audiobooks and whether listeners can distinguish AI from human narration. The company emphasizes transparency about its methodology, including blinded presentation, exposure limits per listener, and attention signals recorded with each judgement.
Pricing model: Paid
$18.00 per hour of audio heard by listeners; $0.30 per judgement on a pair of two 30-second clips; $300.00 for 200 pairs × 5 ratings with 30-second clips (1,000 judgements)
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Turnaround varies by study size. First judgements typically arrive 0–17 minutes after starting in most cases. Studies of 30–60-second pairs collecting 150–200 judgements complete in their first 24 hours. A 480-judgement study completed in four days and a 384-judgement one in three days.
Listeners are English-speaking, US-based people paid per second of audio heard. They are paid $12 per hour of audio heard, with a daily cap of $4 so no one person dominates a day's data. Location is checked at sign-in and on every visit, and identity is verified at payout.
Customer audio is stored for your study only, served only to listeners inside it, and never published, trained on, or shared with another client. You can delete uploads any time through the API.
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