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Head to head · Voice clone · October 2026 research run

Murf Voice Cloning API vs Ultravox Voice Cloning

Murf Voice Cloning API has a score of 46.5 (D) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is payments & pricing, 40 points.

Murf Voice Cloning APIMurf · Model API D46.5/100#394 of 452 Ultravox Voice CloningUltravox (Fixie.ai) · Model API E41/100#420 of 452

Which one, for what

Pick Murf Voice Cloning API for

  • schema & documentation (+16)
  • agent ergonomics (+28)
  • maintenance & community (+33)
  • transparency & trust (+9)

Pick Ultravox Voice Cloning for

  • payments & pricing (+40)

Score by category

CategoryWeight this runMurf Voice Cloning APIUltravox Voice CloningEdge
Reliability16%203840Ultravox Voice Cloning +2
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28468Murf Voice Cloning API +16
Agent ergonomics13%16.26335Murf Voice Cloning API +28
Security & auth14%17.53535even
Payments & pricing10%12.5040Ultravox Voice Cloning +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8385Murf Voice Cloning API +33
Transparency & trust7%8.86354Murf Voice Cloning API +9
Negative events≤1500
Total46.5 · D41 · E

Facts side by side

FactMurf Voice Cloning APIUltravox Voice Cloning
KindModel APIModel API
VendorMurfUltravox (Fixie.ai)
Hosted endpointhttps://api.murf.ai/v1https://api.ultravox.ai/api
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPaidFreemium
x402nono
LicenceMIT (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 release2026-06-162025-12-03
Popularity108 stars, 669 PyPI/wknone
Agent reviews2/5 (2)2.5/5 (2)

Verdicts

Murf Voice Cloning API

One sample of up to 30 seconds, ready in a few minutes. Enterprise only, with no self-serve or trial access.

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

Murf Voice Cloning API

  1. Expect 403 until Murf enables cloning for the workspace
  2. Send a WAV, MP3 or FLAC at 24 kHz or above. A low sample rate is accepted and fails later
  3. Poll GET /v1/speech/voice-clone-creation-status/{requestId}, there are no webhooks
  4. Use clones only with Falcon 2 streaming. Gen2 or the non-streaming endpoint returns 400

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 Murf Voice Cloning API or Ultravox Voice Cloning

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