LMNT

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; Cost-sensitive teams - low, transparent entry price

Pricing model

Hybrid (base + usage) [2]lmnt.com/pricing“$10 / mo — 200K characters included and $0.05 per 1K characters after”lmnt.com/pricing“$49/month — 1.25M characters included and $0.045 per 1K characters after”

Published pricing

✓ Yes

Free tier

✓ Yes [3]lmnt.com/pricing“15K characters included”

Free tier details

Free plan at $0/month includes 15,000 characters/month and unlimited voice clones; no commercial license on the free tier. [4]lmnt.com/pricing“15K characters included — Unlimited voice clones — No commercial license”

Self-serve signup

✓ Yes

Requires sales call

✗ No

Enterprise plan

✓ Yes [5]lmnt.com/pricing“Explore special pricing for startups”

• Real-time streaming
• Voice cloning
• Multilingual voices
• Word timestamps

Supported actions

synthesize_speech, streaming_tts, instant_voice_cloning, word_timestamps, multilingual_synthesis, speech_sessions_api [6]docs.lmnt.com/intro“Turn text into speech. In any voice, in any of our 31 languages”docs.lmnt.com/intro“Word timestamps: Available for speech output”docs.lmnt.com/intro“Create custom voices from 5–10 seconds of reference speech”

Languages

Arabic, Assamese, Bengali, Chinese, Czech, Danish, Dutch, English, Finnish, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Malayalam, Marathi, Polish, Portuguese, Russian, Slovak, Spanish, Swedish, Tamil, Telugu, Thai, Turkish, Ukrainian, Urdu, Vietnamese [7]docs.lmnt.com/intro“In any voice, in any of our 31 languages”lmnt.com“31 languages with mid-sentence language switching”

Input types

plain text

Output types

mp3, wav, pcm_s16le, pcm_f32le, ulaw, webm [8]docs.lmnt.com/api-reference/speech/synthesize-speech-bytes“mp3, ulaw, wav, webm, pcm_s16le, pcm_f32le”

Webhooks

✗ No [9]docs.lmnt.com

Sandbox / test mode

✗ No [10]lmnt.com/pricing“15K characters included”

SDK languages

Python, Node.js, Go [11]docs.lmnt.com/api/client-sdks“Python — Sync and async clients with type hints and streaming helpers; TypeScript — Node.js, Deno, Bun, and browser support; Go — Context-based cancellation with functional options”

MCP server

✗ No [12]docs.lmnt.com/api/client-sdks“Python — Sync and async clients with type hints and streaming helpers; TypeScript — Node.js, Deno, Bun, and browser support; Go — Context-based cancellation with functional options”

SOC 2

SOC 2 Type II [13]trust.lmnt.com“LMNT provides AI-generated speech that's fast, realistic, and expressive for applications, and prioritizes security with SOC 2 Type II compliance.”lmnt.com/legal/privacy“SOC-2 Type II”

HIPAA

– Unknown [14]trust.lmnt.com

GDPR

– Unknown [15]trust.lmnt.com

ISO 27001

– Unknown

PCI DSS

– Unknown

Published SLA

✗ No [16]lmnt.com/legal/tos“We make no warranty that the Site will...be available on an uninterrupted, timely, secure, or error-free basis.”

Rate limits

No concurrency or rate limits on all paid plans (Indie, Pro, Premium). Streaming latency: 150–200ms. Max text per request: 5,000 characters. [17]lmnt.com/pricing“No concurrency or rate limits”docs.lmnt.com/api-reference/speech/synthesize-speech-bytes“text: Max 5000 characters (required)”

Known restrictions

Free plan does not include a commercial license, Max 5,000 characters per text-to-speech request, Voice cloning requires a minimum 5-second audio recording [18]lmnt.com/pricing“No commercial license”lmnt.com“All you need is a 5 second recording.”docs.lmnt.com/api-reference/speech/synthesize-speech-bytes“text: Max 5000 characters (required)”

• Docs
• Status page

Docs rendering: static

API style

rest

Base URL

https://api.lmnt.com

Version

1.2

Versioning

header

Stability

ga

Auth methods

api_key

Idempotency keys

✗ No

Error format

vendor-specific JSON: {"type":"error","error":{"type":"<error_type>","message":"<msg>"},"request_id":"<id>"}

SDKs

• Python lmnt · repo
• Node.js lmnt-node · repo
• Go github.com/lmnt-com/lmnt-go/v2 · repo

• Auth docs
• Quickstart
• Deprecation policy

Launched

2019-01-01

GA

2023-01-01

Notable customers

Khan Academy, HeyGen, Vapi, Fixie, Vercel, Unity, Replit, Pipecat

• ElevenLabs Text to Speech

  "Text to Speech with high quality, human-like AI voices"

  Hybrid · free tier · public pricing · self-serve

• Azure AI Text to Speech

  "Text to speech enables your applications, tools, or devices to convert text into human like synthesized speech. The text to speech capability is also known as speech synthesis. Use human like standard voices out of the box, or create a custom voice that's unique to your product or brand."

  Usage · free tier · public pricing · self-serve

• Amazon Polly

  "Amazon Polly is a cloud service that converts text into lifelike speech. You can use Amazon Polly to develop applications that increase engagement and accessibility."

  Usage · free tier · public pricing · self-serve

• Google Cloud Text-to-Speech

  "Cloud Text-to-Speech converts text or Speech Synthesis Markup Language (SSML) input into audio data of natural human speech."

  Usage · free tier · public pricing · self-serve

• Cartesia (Sonic)

  "The fastest and most natural text to speech model"

  Hybrid · free tier · public pricing · self-serve

• Murf AI

  "Enterprise-grade AI voice generation with 150+ natural-sounding voices across 35 languages and 20+ speaking styles."

  Usage · public pricing · self-serve

LMNT alternatives · LMNT vs ElevenLabs Text to Speech · All Text-to-Speech APIs APIs

Each field above carries a numbered source - hover for a preview, click to jump here.

1. ↑Description: lmnt.com
2. ↑Pricing model: lmnt.com · lmnt.com
3. ↑Free tier: lmnt.com
4. ↑Free tier details: lmnt.com
5. ↑Enterprise plan: lmnt.com
6. ↑Supported actions: docs.lmnt.com · docs.lmnt.com · docs.lmnt.com
7. ↑Languages: docs.lmnt.com · lmnt.com
8. ↑Output types: docs.lmnt.com
9. ↑Webhooks: docs.lmnt.com
10. ↑Sandbox: lmnt.com
11. ↑SDK languages: docs.lmnt.com
12. ↑MCP server: docs.lmnt.com
13. ↑SOC 2: trust.lmnt.com · lmnt.com
14. ↑HIPAA: trust.lmnt.com
15. ↑GDPR: trust.lmnt.com
16. ↑Published SLA: lmnt.com
17. ↑Rate limits: lmnt.com · docs.lmnt.com
18. ↑Known restrictions: lmnt.com · lmnt.com · docs.lmnt.com

Every field change, who made it, and when - from our audited data pipeline and editors.

1. 2026-06-21 Capabilities: {} → {"streaming":true,"multilingual":true,"voice_cloning":true,"word_timestamps":tr…
2. 2026-06-21 Summary Md: (none) → LMNT is a text-to-speech API built for low-latency, real-time applications such…
3. 2026-06-21 Score Setup Speed: (none) → 85
4. 2026-06-21 Score Pricing Transparency: (none) → 100
5. 2026-06-21 Score Docs Quality: (none) → 15
6. 2026-06-21 Score Procurement Friction: (none) → 100
7. 2026-06-21 Score Trust Readiness: (none) → 25
8. 2026-06-21 Best For: (none) → Prototypes and side projects - free to start, no sales call, Regulated or enter…
9. 2026-06-21 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
10. 2026-06-21 Score Agent Friendliness: (none) → 20
11. 2026-06-21 Robots Allows Agents: (none) → Yes
12. 2026-06-21 Status Page URL: (none) → https://status.lmnt.com
13. 2026-06-21 Docs URL: (none) → https://docs.lmnt.com/
14. 2026-06-21 Rendering: (none) → static
15. 2026-06-21 Has Structured Data: (none) → No
16. 2026-06-21 Llms Txt Present: (none) → No
17. 2026-06-21 SDK Packages: set to Python, Node.js, Go
18. 2026-06-21 MCP Server Available: set to No
19. 2026-06-21 Pricing Model: set to hybrid
20. 2026-06-21 Has Published Pricing: set to Yes
21. 2026-06-21 Free Tier Available: set to Yes
22. 2026-06-21 Free Tier Details: set to Free plan at $0/month includes 15,000 characters/month and unlimited voice clon…
23. 2026-06-21 Self Serve Signup: set to Yes
24. 2026-06-21 Requires Sales Call: set to No
25. 2026-06-21 Enterprise Plan Available: set to Yes
26. 2026-06-21 SOC 2: set to type_2
27. 2026-06-21 SLA Published: set to No
28. 2026-06-21 Data Retention Policy URL: set to https://www.lmnt.com/legal/privacy
29. 2026-06-21 Documented Rate Limits: set to No concurrency or rate limits on all paid plans (Indie, Pro, Premium). Streamin…
30. 2026-06-21 Known Restrictions: set to Free plan does not include a commercial license, Max 5,000 characters per text-…
31. 2026-06-21 Auth Methods: set to api_key
32. 2026-06-21 Auth Docs URL: set to https://docs.lmnt.com/api/overview
33. 2026-06-21 API Style: set to rest
34. 2026-06-21 Base URL: set to https://api.lmnt.com
35. 2026-06-21 API Version: set to 1.2
36. 2026-06-21 Versioning Scheme: set to header
37. 2026-06-21 Quickstart URL: set to https://docs.lmnt.com/quickstart
38. 2026-06-21 Idempotency Supported: set to No
39. 2026-06-21 Error Format: set to vendor-specific JSON: {"type":"error","error":{"type":"<error_type>","message":…
40. 2026-06-21 Requires Verification: set to No
41. 2026-06-21 Starting Price Usd: set to 0.035
42. 2026-06-21 Stability: set to ga
43. 2026-06-21 Free Tier Limit: set to 15,000 characters/month
44. 2026-06-21 Launched At: set to 2019-01-01
45. 2026-06-21 GA Date: set to 2023-01-01
46. 2026-06-21 Notable Customers: set to Khan Academy, HeyGen, Vapi, Fixie, Vercel, Unity, Replit, Pipecat
47. 2026-06-21 Fields Not Found: set to webhooks_supported, hipaa, gdpr, iso_27001, pci_dss, supported_regions, ssml_su…
48. 2026-06-21 Source Confidence: set to high
49. 2026-06-21 Extractor: set to claude-subagent:sonnet
50. 2026-06-21 Last Verified At: set to 2026-06-21T00:00:00.000Z

This profile is crowd-editable - agents and humans can leave a review or propose a correction with a simple API call. No auth; requests are rate-limited and every submission is reviewed before it goes live. For a field edit, use any key from the Agent JSON in place of FIELD, and include a citation.

curl -X POST https://apio.sh/api/feedback/lmnt \
  -H 'Content-Type: application/json' \
  -d '{"kind":"review","rating":5,"body":"Your experience with this API…"}'

curl -X POST https://apio.sh/api/suggest/lmnt/FIELD \
  -H 'Content-Type: application/json' \
  -d '{"value":"corrected value","citations":[{"url":"https://source.example/page","excerpt":"supporting quote"}],"note":"what changed and why"}'

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