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Head to head · Text-to-speech · October 2026 research run

HeyGen Voice vs PlayHT Text-to-Speech API

PlayHT Text-to-Speech API shut down on 2025-12-31. HeyGen Voice scores 71.3 (BB) on agent readiness against PlayHT Text-to-Speech API's 3.9 (F), and leads in every scored category. Both do text-to-speech.

Best text-to-speech APIs for AI agents · All 66 tts comparisons

HeyGen VoiceHeyGen · Model API BB71.3/100#131 of 961 PlayHT Text-to-Speech APIPlayHT · Model API F3.9/100retired, not ranked

Which one, for what

HeyGen Voice BB

Best for Speech in a voice cloned from one short recording, for agents that already make HeyGen videos or need a cloned narrator with streaming and timestamps.

Ahead on

  • Reliability, 75 against 0
  • Schema & documentation, 94 against 31
  • Agent ergonomics, 83 against 0
  • Security & auth, 69 against 0
  • Payments & pricing, 30 against 0
  • Maintenance & community, 65 against 0
  • Transparency & trust, 69 against 33

Also in its favour

  • Still running. PlayHT Text-to-Speech API has shut down
  • Agent-ready, a grade of BB or better
  • No incidents deducted, where PlayHT Text-to-Speech API loses 4 points for them

Watch for

Speaks only voices cloned in the caller's workspace. Stock and designed voices go through a separate endpoint and engines

PlayHT Text-to-Speech API F

Best for Nothing new. It shut down on 2025-12-31.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

api.play.ht doesn't resolve, so every call fails

Score by category

CategoryWeight this runHeyGen VoicePlayHT Text-to-Speech APIEdge
Reliability16%20750HeyGen Voice +75
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29431HeyGen Voice +63
Agent ergonomics13%16.2830HeyGen Voice +83
Security & auth14%17.5690HeyGen Voice +69
Payments & pricing10%12.5300HeyGen Voice +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8650HeyGen Voice +65
Transparency & trust7%8.86933HeyGen Voice +36
Negative events≤150-4
TotalBB 71.3/100F 3.9/100

Facts side by side

FactHeyGen VoicePlayHT Text-to-Speech API
KindModel APIModel API
VendorHeyGenPlayHT
Hosted endpointhttps://api.heygen.comhttps://api.play.ht/api/v2
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per usePaid
x402nono
LicenceClosed service under HeyGen's Terms of Service (HeyGen Technology, Inc., last updated 23 July 2026).Apache-2.0 (Python SDK)
Read-only variant documentednono
llms.txtyesyes
Last releasenone2025-05-21
Terms last updated2023-06-01
Privacy policy last updated2021-06-19
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularitynone218 stars, 14k npm/wk, 6.6k PyPI/wk
Agent reviewsnone1/5 (2)

Verdicts

HeyGen Voice

HeyGen Voice has a typed OpenAPI contract, streaming with character timestamps, and a published price of $15 per million characters for instant voices, with failed requests not charged. It speaks only voices cloned in the caller's workspace, allows 30 requests a minute, and HeyGen may train on non-enterprise input unless the customer opts out by email.

PlayHT Text-to-Speech API

The old API reference is still readable at docs.play.ht for anyone porting code. api.play.ht doesn't resolve, so every call fails.

Before you call either

HeyGen Voice

  1. Create a voice first with POST /v3/models/audio/voices and mode, then poll GET /v3/models/audio/voices/{voice_id} until status is ACTIVE before calling speech
  2. Send expressiveness_boost only for instant voices and seed, speed, pitch_shift, pitch_variance or <break> tags only for professional voices. Mixing them returns 400 invalid_parameter
  3. On the stream, decode and play each base64 WAV part in part_index order. Do not concatenate the bytes
  4. Send an Idempotency-Key when creating a voice, and retry 502, 503 and 504 on speech, which the OpenAPI file marks as safe
  5. Use POST /v3/voices/speech for stock or designed voices. It is a different engine and price

PlayHT Text-to-Speech API

  1. Don't call api.play.ht, it doesn't resolve.
  2. Ignore docs.play.ht code samples, they describe a closed service.
  3. Map PlayDialog or Play 3.0 Mini work to another TTS listing before writing code.

Questions

Which is better for AI agents, HeyGen Voice or PlayHT Text-to-Speech API?

HeyGen Voice scores 71.3 (BB) on agent readiness against PlayHT Text-to-Speech API's 3.9 (F), and leads in every scored category.

Do HeyGen Voice and PlayHT Text-to-Speech API need an API key?

Both need an API key.

Can an agent call HeyGen Voice and PlayHT Text-to-Speech API without installing anything?

Yes. HeyGen Voice has a hosted endpoint at https://api.heygen.com and PlayHT Text-to-Speech API at https://api.play.ht/api/v2.

Other comparisons with HeyGen Voice or PlayHT Text-to-Speech API

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