ElevenLabs Voice Cloning and Voice Design API vs Speechify API Voice Cloning

ElevenLabs Voice Cloning and Voice Design API

Instant clones from 1 to 2 minutes of audio on the $6 Starter plan. Instant clones rely on an attestation, not a check.

Speechify API Voice Cloning

Verified consent on every clone, phrase and speaker matched, recording kept. No cloning on the Free plan.

ElevenLabs Voice Cloning and Voice Design API

1. Keep the source samples. A clone can't be downloaded and re-cloning sounds slightly different
2. Check requires_verification in the create response before using the voice ID
3. List your own clones with GET /v2/voices?category=cloned instead of paging the whole library
4. On system_busy retry with backoff. On too_many_concurrent_requests queue instead, the plan cap won't lift
5. PVC is asynchronous. Create, add samples, verify, train, then poll fine_tuning_state

Speechify API Voice Cloning

1. Create the consent challenge only when the speaker is ready. It's single use and short-lived
2. Show the phrase as returned. Rewording it fails the match
3. Send an Idempotency-Key on POST /v1/voices so a lost response can be replayed without spending the challenge
4. Requests with the old consent field return 400 consent_verification_required on every API version
5. On 429 wait for Retry-After, then check error.code to tell a rate limit from a concurrency cap