Gradium clones from roughly 10 seconds and offers a free tier for non-commercial use, while paid plans start at $13 for 225K credits; Pro Voice Clone requires a minimum of 30 minutes of training, and language coverage includes a limited set of English, French, German, Spanish, and Portuguese.

Cartesia also enables cloning from about 10 seconds, extending to 60 seconds for better accent capture, with Pro Voice Clones needing 30+ minutes of training; pricing ranges from $5 for 100K credits up to $299 for 8M, supporting 44 languages.

A 2026 comparison analyzes seven voice cloning APIs, evaluating speaker similarity, consent verification, licensing, languages, and pricing using a standardized 10-second reference clip.

Practical guidance maps APIs to jobs: budget scaling favors Inworld or Fish Audio, low latency and broad language coverage favor Cartesia, strict consent for brand voices favors ElevenLabs PVC, European languages with a free test tier point to Gradium, watermarking and deepfake detection are highlighted with Resemble AI, and emotion-directed delivery is associated with Hume.

Key takeaways note ElevenLabs as a common default but trailing Hume on same-speaker identity; consent checks are publicly documented for pro clones by ElevenLabs, Fish Audio, and Resemble AI; price per 1M characters varies, with Inworld TTS-2 Flash as low as $7 on higher plans, Fish Audio at $15 per 1M UTF-8 bytes, and ElevenLabs up to $100 for v3; Hume requires at least 15 seconds of input, making 10 seconds insufficient; language coverage spans from 5 to 200+ languages.

ElevenLabs offers Instant Voice Cloning and Professional Voice Cloning, with audio requirements ranging from 1–2 minutes for IVC to 30 minutes or more for PVC, and a strict consent gate via Voice Captcha for PVC.

Resemble AI’s Rapid Clone uses 10 seconds, with Professional Clone needing 10–25+ minutes and explicit, verifiable consent; features watermarking and multilingual support (Chatterbox supports 23 languages); business-focused pricing with higher tiers, and TTS rates no longer publicly listed.

Hume’s Octave can clone from a minimum of 15 seconds (or an uploaded file) across 11 languages; commercial use starts at $14 per month on the Creator plan, with higher tiers providing API access, and its leaderboard shows differences between identity fidelity and naturalness.

Fish Audio charges $15 per 1M UTF-8 bytes, supports 83 languages, and offers instant cloning from around 10 seconds; professional cloning requires live ownership verification, with commercial use starting on the $15 Plus plan.

Inworld supports instant cloning from 3 seconds, with sample lengths up to 30 seconds boosting similarity; on-demand pricing is $25 per 1M characters with tiered discounts, claiming 200+ languages/locales, while professional cloning is in beta and English-only.