Free Ultra-low-latency text-to-speech for AI agents

Run it free (4)

• Groq Free Plan Orpheus TTS · free_speech · free

  Free Plan text-to-speech limits for two Orpheus voices.

  Limits: scope: organization · models: [object Object]

  Source · asOf 2026-10-24 · Rate-limits page fetched twice 2026-10-24 about 10 s apart (identical HTML; the page shows no last-updated date). Same freeRows payload: canopylabs/orpheus-arabic-saudi and canopylabs/orpheus-v1-english both read RPM 10, RPD 100, TPM 1.2K, TPD 3.6K (unchanged). Same exception and account-page caveat as the chat row. Developer-plan numbers were not copied.

• Gemini 3.8 Flash TTS free tier · free_speech · free_tier_unspecified

  gemini-3.8-flash-tts standard text input and audio output marked Free of charge. gemini-3.8-flash-lite-tts, gemini-3.1-flash-tts-preview and gemini-2.5-flash-preview-tts standard cells are also Free of charge.

  Limits: none stored.

  Source · asOf 2026-10-26 · Pricing page fetched twice 2026-10-26 (identical text; page footer 'Last updated 2026-10-26 UTC'): gemini-3.8-flash-tts is 'Our 3.8 Flash Text-to-Speech audio model engineered for studio-grade voice fidelity, expressive acting, and long-form stability.' Its Standard Free Tier input and output cells read 'Free of charge', as do those of gemini-3.8-flash-lite-tts, gemini-3.1-flash-tts-preview and gemini-2.5-flash-preview-tts ('Our 2.5 Flash text-to-speech audio model optimized for price-performant, low-latency, controllable speech generation.'). Batch TTS free tier is 'Not available' for 3.8 Flash TTS and 2.5 Flash Preview TTS. gemini-2.5-pro-preview-tts is not included: its Standard free-tier cells read 'Not available'. No numeric free audio cap. https://ai.google.dev/gemini-api/docs/rate-limits (fetched twice 2026-10-26, identical text, 'Last updated 2026-10-26 UTC') publishes no free-tier RPM, TPM or RPD and says 'View your active rate limits in AI Studio', so limits stay null. Re-quoted in v0.12.130 (previously fetched twice 2026-10-24, page footer 'Last updated 2026-10-22 UTC'); gemini-2.5-flash-preview-tts added to this row in v0.12.130 as a Depot data decision (approvalRef 'Ethan delegation 2026-10-21 19:41 ET t55u', decidedBy Agent Depo); no price stored, not a $0 price-sort row.

• Kokoro-82M · open_weights · oss · Apache-2.0

  Downloadable Kokoro 82M text-to-speech weights.

  Limits: none stored.

  Source · asOf 2026-10-25 · Model card fetched 2026-10-03 says license: apache-2.0 and Apache-licensed weights. The repo LICENSE file path returned 404; the kokoro code LICENSE on GitHub was also fetched and is Apache-2.0. README re-fetched twice 2026-10-25 (HTTP 200, byte-identical): front matter 'license: apache-2.0'; raw/main/LICENSE still 404 (twice); https://raw.githubusercontent.com/hexgrad/kokoro/main/LICENSE (HTTP 200) is 'Apache License Version 2.0, January 2004'.

• Piper · free_speech · oss · MIT

  Open-source local text-to-speech engine.

  Limits: none stored.

  Source · asOf 2026-10-25 · LICENSE.md fetched 2026-10-03 is MIT, copyright 2022 Michael Hansen. Voice packs are a separate download; rhasspy/piper-voices card says license mit. Re-fetched twice 2026-10-25 (~10 s apart, plain curl, no login): HTTP 200, no redirect, byte-identical: 'MIT License' / 'Copyright (c) 2022 Michael Hansen'. License unchanged.

Reference (docs, public datasets and benchmarks) (0)

None.