AI API Router Directory

Play.ht is an AI text-to-speech platform with 900+ ultra-realistic voices, 32+ languages, voice cloning, and a real-time voice generation API. Plans: Free (1,000 chars/mo, no API), Creator ($31.20/mo billed annually, ~3M chars/yr), Unlimited ($99/mo regular; API add-on billed separately), Enterprise custom. Note: the official pricing page is JS-rendered and could not be fully captured; details sourced from third-party pricing guides.

Free tier = 1,000 chars/month (third-party guide; official page not captured); too small to value reliably against current API rates, and sources conflict on exact current pricing — set to null rather than guess.

SearXNG: free, open-source, self-hosted metasearch engine aggregating up to 264 search backends with a JSON Search API (format=json). No vendor, no API key required (keyless on self-hosted or public instances), no pricing — cost is only your hosting. Rate limiting/bot detection configured per instance.

Fully free (open source); no credits or vendor pricing to quantify.

Soniox (soniox.com) sells speech-to-text, text-to-speech and speech translation through REST and WebSocket APIs, billed by tokens rather than per minute. Official pricing works out to about $0.10 per hour for async file transcription and $0.12 per hour for real-time streaming, expressed as $1.50 per 1M input audio tokens (async) or $2.00 per 1M (real-time), with input and output text at $3.50–$4.00 per 1M tokens; TTS is $4.00 per 1M input text tokens and $21.50 per 1M output audio tokens, about $0.70 per hour of generated speech. Translation across 60+ languages, speaker diarization, language identification and smart formatting are bundled in the same call at no extra cost.

No free tier or credit grant stated on official pages (checked 2026-09-16; reviewed soniox.com/pricing, soniox.com/docs and the soniox.com home page).