How do their growth rates compare?

Gradium has a month-over-month growth rate of +128.7%; Tunk.ai has -100%.

How does pricing compare?

Gradium: Freemium, Contact for Pricing. Free tier with 45k credits per month. Paid plans run $12/mo (XS), $39/mo (S), $312/mo (M), and $1,480/mo (L) on monthly billing, with yearly billing giving one month free. Usage is credit-based (1 credit per TTS character, 3 credits per STT second, 30 credits per second for speech-to-speech translation). Enterprise pricing is custom. Tunk.ai: Free Trial, Contact for Pricing. Enterprise-oriented with a free trial / demo path. No public self-serve price list is shown: prospective customers are asked to book a demo or contact the team, and pricing is reported as per-minute or customized enterprise volume tiers for voice agents, real-time telephony streaming and speech-to-text APIs.

What are alternatives to Gradium and Tunk.ai?

Other tools in related categories include ElevenLabs, Fish Audio, Groq, Cartesia, Deepgram Voice AI.

Gradium vs Tunk.ai — Traffic (126.42K vs 0), Pricing & Verdict

Open AI Tools

Gradium vs Tunk.ai — Traffic (126.42K vs 0), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Gradium	Tunk.ai
Official Domain	gradium.ai	tunk.ai
Pricing Model	Freemium, Contact for Pricing	Free Trial, Contact for Pricing
Monthly Visits	126.42K (126,416)	0 (0)
MoM Traffic Delta	+71.15K (+128.7%)	-3.37K (-100%)
Primary Market & Share	🇫🇷 France (26.5%)	🌐 Global (—)
Direct Visits / mo	27.16K	0
User Rating	4.5	4.2
Supported Platforms	Website	Website

Gradium

Real-time voice AI APIs with 50 ms to first audio

Ultra-low-latency voice models

Text-to-speech, speech-to-text, and live speech-to-speech translation reach roughly 50 ms to first audio, tuned for conversational agents rather than batch processing.

Tiered voice cloning and voice design

Clone a voice from a short sample for everyday use, move up to pro cloning for production quality, or generate a brand-new voice from a text description.

Developer-first API and SDKs

WebSocket streaming, Python and Rust SDKs, custom vocabulary, semantic VAD, and code-switching support make integration straightforward for agent builders.

Open on-device TTS with Phonon

Phonon is Gradium's openly available TTS model that runs on-device for offline or privacy-sensitive deployments.

Strengths & Pros

+Very low latency tuned specifically for live voice agents rather than offline batch jobs
+Full voice stack in one API: TTS, STT, translation, cloning, and voice design
+Genuine free tier (45k credits/month) and low $12/mo entry point for prototyping
+Enterprise-grade options including on-premises deployment, data residency, and an open on-device TTS model