Agentifact assessment — independently scored, not sponsored. Last verified Mar 6, 2026.
LMNT
LMNT is a fast, affordable text-to-speech API optimized for real-time conversational applications such as voice agents, games, and interactive companions. It offers ultra-low latency streaming audio with sub-300ms time-to-first-audio, unlimited voice clones on all paid plans, and SDKs for Python and Node.js. LMNT is integrated directly into Vapi as a supported voice provider. Pricing tiers start at free (15K chars/mo), Indie at $10/mo (200K chars, $0.05/1K extra), Pro at $49/mo (1.25M chars), and Premium at $199/mo (5.7M chars), all with a commercial license.
Viable option — review the tradeoffs
You need ultra-low latency TTS for real-time voice agents that respond instantly without awkward pauses.
Consistently ~150ms latency with natural voices; reliable for live convos but watch char limits on lower tiers.
You want branded or custom voices for your AI agents without hiring voice actors or recording hours of audio.
Lifelike clones work great for branding; pro clones need more audio for polish, no training on your data.
You're building on Vapi or similar voice platforms and need a drop-in TTS provider with commercial licensing.
Plug-and-play with low setup; scales well up to Premium tier for high volume.
Character limits hit fast in production
Free tier caps at 15K chars/mo, Indie at 200K—busy agents burn through quickly, triggering $0.05/1K overages; monitor usage and upgrade early.
Free tier too restrictive for testing at scale
15K chars/mo limits real-world prototyping; paid tiers start cheap but require commitment for serious builds.
Trust Breakdown
What It Actually Does
LMNT turns text into natural-sounding speech using AI voices, including ones you clone from short audio clips. It delivers fast, low-latency audio for real-time apps like voice agents and games.[1][2][3][7]
LMNT is a fast, affordable text-to-speech API optimized for real-time conversational applications such as voice agents, games, and interactive companions. It offers ultra-low latency streaming audio with sub-300ms time-to-first-audio, unlimited voice clones on all paid plans, and SDKs for Python and Node.js. LMNT is integrated directly into Vapi as a supported voice provider.
Pricing tiers start at free (15K chars/mo), Indie at $10/mo (200K chars, $0.05/1K extra), Pro at $49/mo (1.25M chars), and Premium at $199/mo (5.7M chars), all with a commercial license.
Score Breakdown
Protocol Support
Capabilities
Governance
- audit-log
- resource-limits
- rate-limiting