# Gradium vs Tunk.ai

Gradium records 126,416 monthly visits with +128.7% month-over-month growth and Freemium, Contact for Pricing pricing. Tunk.ai records 0 monthly visits with -100% growth and Free Trial, Contact for Pricing pricing.

| Metric | [Gradium](https://openaitools.app/tool/gradium) | [Tunk.ai](https://openaitools.app/tool/tunk) |
| :--- | :--- | :--- |
| Website URL | https://gradium.ai | https://www.tunk.ai |
| Categories | AI Text-to-Speech, AI Speech-to-Text, AI Voice Cloning, AI API | AI Speech-to-Text, AI Agent, AI Transcription, AI API |
| Pricing Model | Freemium, Contact for Pricing | Free Trial, Contact for Pricing |
| Monthly Visits | 126,416 | 0 |
| MoM Growth Rate | +128.7% | -100% |
| Primary Market | France | Global |
| Direct Visits | 27,158 | 0 |
| Review Score | 4.5 | 4.2 |
| Saved Count | 0 | 0 |
| Supported Platforms | Website | Website |

## Gradium

Gradium targets teams building conversational voice agents, telephony bots, and real-time translation experiences where latency decides whether a product feels natural. Its model lineup covers the full loop: text-to-speech for synthesis, speech-to-text for transcription, live voice-to-voice translation, instant cloning from a short audio sample, pro cloning for production-grade custom voices, and voice design that creates a brand-new voice from a text description alone.

The platform is API-first, with SDKs for Python and Rust, WebSocket streaming, semantic voice activity detection, custom vocabularies, code-switching support, and integrations such as LiveKit and Pipecat so teams can drop it into existing agent stacks. Gradium also ships Phonon, an open on-device TTS model that can run offline, which matters for privacy-sensitive or embedded deployments.

Pricing is credit-based across five self-serve tiers plus enterprise. Credits map to usage: text-to-speech costs 1 credit per character, speech-to-text 3 credits per second, speech-to-text translation 4 credits per second, and speech-to-speech translation 30 credits per second. Higher tiers unlock commercial use, more custom voices, pro clones, and better concurrency, while enterprise adds dedicated inference, on-premises deployment, and options such as Baseten or SageMaker endpoints.

**Pricing & Plans:** 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.

- **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.
- **Scaling and deployment options:** Gradium handles concurrency tiers for growing traffic and supports dedicated inference, on-premises deployment, and Baseten or SageMaker endpoint hosting.

**Strengths:** 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

**Limitations:** Credit-based pricing is harder to forecast than flat per-seat plans, and unused plan credits expire monthly; Pro voice cloning and higher concurrency sit behind the larger monthly tiers; Feature depth varies by plan, so commercial use requires at least the XS tier

[Profile (Markdown)](https://openaitools.app/tool/gradium.md)

## Tunk.ai

Tunk.ai is a voice AI platform from LogicNimbus Private Limited, aimed at teams that need to put AI on the phone rather than just in a chat window. The headline product, ANCHOR, is an agent builder: you describe in plain English what the agent should do, who it talks to and what a good call looks like, and the platform assembles the voice, prompts, knowledge and call flow for you. From there you attach tools, endpoints and a phone number, test the conversation, and deploy it either to a live line, inside your own app, or through the API.

Under the hood the platform is organized into six subsystems, covering the call flow engine, a centralized knowledge base, mid-call tools and actions, a unified assistant hub, a workflow engine for branching and escalation, and records plus analytics for every call. Because the agent can call your own endpoints during a conversation, it can book appointments, look up or update records and then write the outcome back to Salesforce, HubSpot or Zoho — analytics then return sentiment, intent and outcome scoring as soon as each call ends. Phone numbers are provisioned through Twilio or Plivo and campaigns can be pointed at a contact list, so outbound dialing runs at whatever volume you need.

The second pillar is speech to text. Real-time transcription returns text while the caller is still speaking, across dozens of languages and accents, and it is available directly through an API or the built-in playground. The platform supports multiple LLM and transcriber providers — including OpenAI and Azure — so you can swap the underlying model without rebuilding an agent. Tunk.ai is listed with NVIDIA Inception and participates in the Speechmatics Startup Program and Startup India. Pricing is enterprise-oriented; the site routes buyers to a demo or sales conversation rather than publishing flat self-serve rates.

**Pricing & Plans:** 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.

- **ANCHOR Agent Builder:** Describe an agent in plain English and the platform sets up the voice, prompts, knowledge and call flow; then test, refine and deploy to a phone line, an app or the API.
- **Real-Time Speech to Text:** Streaming transcription returns text while the caller is still speaking, covering dozens of languages and accents through the API or the built-in playground.
- **Tools, Actions and CRM Sync:** Hand the agent your own endpoints so it can book, look up and update records mid-call, then write the outcome back to Salesforce, HubSpot or Zoho.
- **Outbound Campaigns and Cloud Dialer:** Connect Twilio or Plivo, point a campaign at your contact list, and let the agent handle every call while you manage only the queue.
- **Call Analytics and Compliance Records:** Sentiment, intent and outcome are scored on each conversation the moment it ends, with transcripts and costs retained so you can audit and improve campaigns.

**Strengths:** Agents are configured in plain English, which lowers the barrier for non-engineers; Covers both sides of voice: an agent builder for calls and a real-time speech-to-text API; Mid-call integrations write outcomes back into Salesforce, HubSpot and Zoho; Carrier-agnostic telephony through Twilio or Plivo, with inbound and outbound support

**Limitations:** No published self-serve pricing, so you must talk to sales before you can budget; Enterprise setup with carriers, CRM and knowledge sources takes real integration work; Public documentation and third-party reviews are thinner than for larger voice AI vendors

[Profile (Markdown)](https://openaitools.app/tool/tunk.md)

## Frequently Asked Questions

### How do Gradium and Tunk.ai compare in monthly traffic?

Gradium has 126,416 monthly visits, while Tunk.ai has 0. Traffic estimates describe audience size, not product quality.

### 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.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [ElevenLabs](https://openaitools.app/tool/elevenlabs-io) | 42,396,771 | +26.1% | Freemium, Paid, Contact for Pricing | AI audio platform for speech, agents, music and dubbing | [.md](https://openaitools.app/tool/elevenlabs-io.md) |
| 2 | [Fish Audio](https://openaitools.app/tool/fish-speech) | 8,557,159 | +1.6% | Freemium | Studio-grade AI text to speech and voice cloning | [.md](https://openaitools.app/tool/fish-speech.md) |
| 3 | [Groq](https://openaitools.app/tool/groq) | 3,987,936 | +10% | Paid | Ultra-fast AI inference on the LPU and LPX platform | [.md](https://openaitools.app/tool/groq.md) |
| 4 | [Cartesia](https://openaitools.app/tool/cartesia-ai) | 1,782,707 | +49.7% | Contact for Pricing | Real-time voice AI models and agents you can build on | [.md](https://openaitools.app/tool/cartesia-ai.md) |
| 5 | [Deepgram Voice AI](https://openaitools.app/tool/deepgram-voice-ai) | 863,852 | +31.8% | Free Trial | Real-time speech-to-text, text-to-speech and voice agents in one API platform | [.md](https://openaitools.app/tool/deepgram-voice-ai.md) |
| 6 | [JustCall](https://openaitools.app/tool/justcall) | 780,285 | +11.8% | Paid | AI communication platform for sales and support teams | [.md](https://openaitools.app/tool/justcall.md) |
| 7 | [Vapi](https://openaitools.app/tool/vapi) | 662,301 | -11.4% | Freemium | Build, test, and deploy production-grade voice AI agents over API | [.md](https://openaitools.app/tool/vapi.md) |
| 8 | [AssemblyAI](https://openaitools.app/tool/assemblyai) | 453,591 | -6.9% | Freemium, Contact for Pricing | Speech-to-text and voice intelligence APIs for developers | [.md](https://openaitools.app/tool/assemblyai.md) |
| 9 | [Noiz AI](https://openaitools.app/tool/noiz-ai) | 441,445 | -30.1% | Paid | Clone voice, control emotion, and create lifelike speech. | [.md](https://openaitools.app/tool/noiz-ai.md) |
| 10 | [Soniox](https://openaitools.app/tool/soniox) | 335,647 | +2.2% | Paid | One speech AI API for recognition, generation, and translation in 60+ languages | [.md](https://openaitools.app/tool/soniox.md) |

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Source: https://openaitools.app/compare/gradium-vs-tunk

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