โ€” Audio / Voice Cloning

LMNT

Last updated June 21, 2026 ยท Reviewed by ToolForge Editorial

Sub-150ms voice cloning AI. Built for real-time voice agents and game dialogue.

โ˜… 4.6/5 ยท 50K+ developers ยท Since 2023 ยท Free tier (12,500 chars/mo)
$0.006/sec Pay-as-you-go
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The fastest voice cloning API

LMNT is the underdog of voice AI โ€” founded by ex-Google engineers, it's the only major TTS API that streams under 150ms while still sounding natural. Built for real-time voice agents where latency kills the experience. ElevenLabs sounds better; LMNT responds faster.

Who it's for: Voice agent builders, game devs who need real-time NPC dialogue, app devs who need snappy TTS in their products.

Key features

150ms Sub-150ms latency

Streams audio chunks as fast as the model generates them. The fastest of any major TTS API. Critical for conversational agents where every 100ms matters.

Clone 10-second voice cloning

Record 10 seconds of clean audio, get a voice clone in under a minute. Voice quality is good โ€” not ElevenLabs-quality, but close enough for production agents.

UE5 Unreal Engine plugin

Official Unreal Engine 5 plugin โ€” generate NPC dialogue on the fly inside game engines. Unity SDK also available. Real use case for indie game devs.

$0.006/s Honest pricing

$0.006 per second of generated audio. Half the price of ElevenLabs' Creator tier for streaming. Free tier gives 12,500 chars/month forever.

The honest take

โœ“ What works

  • Fastest TTS API on the market โ€” sub-150ms streaming
  • Half the price of ElevenLabs for real-time use
  • Quality is good, not best-in-class
  • Official UE5 plugin is genuinely useful
  • Free tier that doesn't expire

โœ— What doesn't

  • Voice quality is a tier below ElevenLabs
  • Smaller voice library (~50 stock voices vs 3,000+ on ElevenLabs)
  • No voice marketplace or community voices
  • Less mature than ElevenLabs โ€” newer API, fewer integrations

Verdict

LMNT is the right pick when latency matters more than voice quality โ€” voice agents, real-time apps, game dialogue. If you're building a polished audio product where voice quality is the entire experience, pay for ElevenLabs. For everything else, LMNT is fast, cheap, and good enough.

๐Ÿ’ก Transparency: This review contains affiliate links. If you sign up through our link, we may earn a commission at no cost to you. We only recommend tools we use ourselves. Full disclosure.

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Sub-150ms voice AI ยท Free tier (12,500 chars/mo)

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