Last updated 06-30-2026
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LMNT
LMNT is a text-to-speech platform for teams that need natural voice in live products. It targets conversational apps, voice agents, games, and other experiences where latency and voice quality both matter.
The product pairs a free web playground with a developer API. You can preview voices in the browser, then wire the same models into your app through streaming endpoints built for real-time use.
LMNT is built by a small team in Palo Alto with backgrounds at Google[x], Meta, Microsoft, and other startups. The company is backed by investors including Elad Gil and Conviction, and lists SOC-2 Type II compliance on its site.
Customers shown on the homepage include Khan Academy, HeyGen, Vapi, Vercel, Unity, and Replit. That mix points to education, developer tooling, and interactive media as common deployment paths.
Clone a studio-quality voice from a 5-second recording
Generate speech in 31 languages, including mid-sentence language switches
Stream audio with roughly 150-200ms latency for live conversations
Use unlimited voice clones on API plans with no concurrency caps
Try voices free in the web playground before integrating the API
Free playground and API tier make it easy to test voices before committing budget.
Unlimited voice clones on API plans remove a common per-voice billing headache.
Named customers include Khan Academy, Vercel, and Unity, which signals production-grade usage.
Usage beyond included characters adds per-thousand-character overage fees on paid tiers.
No standalone mobile app; integration happens through the API or web playground.
Enterprise and custom plans require contacting the team rather than self-serve checkout.
Is LMNT free to use?
Yes. LMNT offers a free web playground for testing voices, plus a free API tier that includes 15,000 characters and unlimited voice clones. Paid API plans start at $10 per month.
How many languages does LMNT support?
LMNT supports 31 languages. The site says its voices can switch languages mid-sentence, similar to how people code-switch in conversation.
How fast is LMNT speech streaming?
LMNT advertises 150-200ms latency for low-latency streaming, which makes it suited to conversational apps, agents, and games that need responsive audio.
Does LMNT offer startup pricing?
Yes. LMNT runs a Startup Grant that provides 45 million credits free for three months, with 15 million characters per month. Teams with fewer than 20 employees can apply through the startup page.
What companies use LMNT?
LMNT lists Khan Academy, HeyGen, Vapi, Fixie, Vercel, Unity, Replit, and Pipecat among the teams using its speech models.