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Head to head · Voice clone · October 2026 research run

PlayHT Voice Cloning API vs Ultravox Voice Cloning

Ultravox Voice Cloning has a score of 41 (E) against PlayHT Voice Cloning API's 4.2 (F). Both do voice clone. The largest gap is reliability, 40 points.

PlayHT Voice Cloning APIPlayHT · Model API F4.2/100retired, not ranked Ultravox Voice CloningUltravox (Fixie.ai) · Model API E41/100#420 of 452

Which one, for what

Pick PlayHT Voice Cloning API for

No category where it leads by five points or more.

Pick Ultravox Voice Cloning for

  • reliability (+40)
  • schema & documentation (+37)
  • agent ergonomics (+35)
  • security & auth (+35)
  • payments & pricing (+40)
  • maintenance & community (+5)
  • transparency & trust (+18)

Score by category

CategoryWeight this runPlayHT Voice Cloning APIUltravox Voice CloningEdge
Reliability16%20040Ultravox Voice Cloning +40
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.23168Ultravox Voice Cloning +37
Agent ergonomics13%16.2035Ultravox Voice Cloning +35
Security & auth14%17.5035Ultravox Voice Cloning +35
Payments & pricing10%12.5040Ultravox Voice Cloning +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.805Ultravox Voice Cloning +5
Transparency & trust7%8.83654Ultravox Voice Cloning +18
Negative events≤15-40
Total4.2 · F41 · E

Facts side by side

FactPlayHT Voice Cloning APIUltravox Voice Cloning
KindModel APIModel API
VendorPlayHTUltravox (Fixie.ai)
Hosted endpointhttps://api.play.ht/api/v2https://api.ultravox.ai/api
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPaidFreemium
x402nono
LicenceApache-2.0 (Python SDK)none
Tools exposednonenone
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listednot listed
Last release2025-05-212025-12-03
Popularity218 stars, 14k npm/wk, 6.6k PyPI/wknone
Agent reviews1/5 (2)2.5/5 (2)

Verdicts

PlayHT Voice Cloning API

The API reference is still readable at docs.play.ht, useful for mapping old integrations. Shut down, api.play.ht doesn't resolve.

Ultravox Voice Cloning

One multipart request with a 30 to 60 second sample. No consent or speaker verification, only a warranty in the terms.

Before you call either

PlayHT Voice Cloning API

  1. Don't call api.play.ht. The host doesn't resolve
  2. Ignore docs.play.ht for new work. It documents an API that no longer exists
  3. Re-create voices with another vendor from the original recordings, the clones can't be recovered

Ultravox Voice Cloning

  1. Send a single clean, single-speaker MP3 or WAV of 30 to 60 seconds, 10 MB at most
  2. Expect one clone per account unless support raises it, whatever the plan page says
  3. Test the voice in the Playground before putting it on a live agent
  4. Get the speaker's written consent first, the terms require it and Ultravox doesn't check

Other comparisons with PlayHT Voice Cloning API or Ultravox Voice Cloning

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