# AssemblyAI vs Tunk.ai

AssemblyAI records 453,591 monthly visits with -6.9% 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 | [AssemblyAI](https://openaitools.app/tool/assemblyai) | [Tunk.ai](https://openaitools.app/tool/tunk) |
| :--- | :--- | :--- |
| Website URL | https://www.assemblyai.com | https://www.tunk.ai |
| Categories | AI Speech-to-Text, AI Transcription, AI Speech Recognition, AI Developer Tools | AI Speech-to-Text, AI Agent, AI Transcription, AI API |
| Pricing Model | Freemium, Contact for Pricing | Free Trial, Contact for Pricing |
| Monthly Visits | 453,591 | 0 |
| MoM Growth Rate | -6.9% | -100% |
| Primary Market | Brazil | Global |
| Direct Visits | 281,472 | 0 |
| Review Score | 4.6 | 4.2 |
| Saved Count | 9 | 0 |
| Supported Platforms | Website | Website |

## AssemblyAI

AssemblyAI builds speech AI models and the infrastructure to run them, aimed at developers and product teams adding voice to an application. Its core offering is speech-to-text: an asynchronous API for pre-recorded audio, a realtime API for streaming and voice agents, and a synchronous API for short clips and dictation. The company's flagship accuracy model is marketed as top of independent benchmarks, with strong speaker diarization and native code-switching across dozens of languages.

On top of transcription, AssemblyAI offers a Speech Understanding API that layers tasks such as summarization, sentiment, topic detection, PII redaction, content moderation and guardrails onto transcripts. It has also released its first text-to-speech model, AssemblyAI-TTS-1, built for voice agents on live calls, plus an LLM Gateway for routing model calls and a Dictation API. Models can run on AssemblyAI's managed inference cloud, or self-hosted in a customer's own VPC or on-premises environment.

Pricing is pay-as-you-go after a free trial: for example, pre-recorded transcription is billed per audio hour, with optional add-ons such as speaker diarization, keyterms prompting and medical or veterinary modes priced separately. Enterprise plans offer custom rate limits, higher concurrency and compliance features including SOC 2 Type 2, HIPAA and GDPR.

**Pricing & Plans:** Free trial to start, then pay-as-you-go per audio hour and per add-on feature — for example around $0.15/hr for the Universal-2 model and around $0.21/hr for the more accurate Universal-3.5 Pro model, with extras like diarization billed individually. Enterprise and custom-rate-limit plans are available via sales.

- **Async, realtime and sync speech-to-text:** Choose pre-recorded transcription for files, a realtime API for live streams and voice agents, or a synchronous endpoint for short clips and dictation.
- **Audio intelligence and Speech Understanding:** Layer summarization, sentiment, topic detection, PII redaction, content moderation and guardrails onto transcripts without building your own models.
- **Text-to-speech for voice agents:** AssemblyAI-TTS-1 is trained on real phone calls for natural, low-latency speech, targeted at IVR and voice-agent use cases.
- **High accuracy with diarization:** Flagship models emphasise exact transcription, speaker labels and native code-switching across many languages, supported by published benchmarks.
- **Flexible deployment:** Run models on AssemblyAI's managed cloud with unlimited concurrency, or self-host in your own VPC or on-prem for full data control.

**Strengths:** One API family covering transcription, understanding and text-to-speech; Transparent per-hour pay-as-you-go pricing with a free trial; Self-hosting option for teams with strict data-residency requirements; Strong accuracy and diarization performance backed by published benchmarks

**Limitations:** Costs scale with volume and add-ons can raise the effective per-hour rate; Some advanced features are model-specific and not available on every model; Heavier product surface than a simple transcription API may be overkill for basic needs

[Profile (Markdown)](https://openaitools.app/tool/assemblyai.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 AssemblyAI and Tunk.ai compare in monthly traffic?

AssemblyAI has 453,591 monthly visits, while Tunk.ai has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

AssemblyAI has a month-over-month growth rate of -6.9%; Tunk.ai has -100%.

### How does pricing compare?

AssemblyAI: Freemium, Contact for Pricing. Free trial to start, then pay-as-you-go per audio hour and per add-on feature — for example around $0.15/hr for the Universal-2 model and around $0.21/hr for the more accurate Universal-3.5 Pro model, with extras like diarization billed individually. Enterprise and custom-rate-limit plans are available via sales. 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 | [OpenAI Platform](https://openaitools.app/tool/openai) | 234,678,639 | -9.6% | Paid | Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents. | [.md](https://openaitools.app/tool/openai.md) |
| 2 | [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) |
| 3 | [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) |
| 4 | [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) |
| 5 | [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) |
| 6 | [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) |
| 7 | [Gladia](https://openaitools.app/tool/gladia) | 232,451 | +6.4% | Freemium, Contact for Pricing | Speech-to-text and audio intelligence API for production voice products | [.md](https://openaitools.app/tool/gladia.md) |
| 8 | [Gradium](https://openaitools.app/tool/gradium) | 126,416 | +128.7% | Freemium, Contact for Pricing | Real-time voice AI APIs with 50 ms to first audio | [.md](https://openaitools.app/tool/gradium.md) |
| 9 | [Video SDK](https://openaitools.app/tool/video-sdk) | 125,669 | -28.3% | Freemium, Paid, Contact for Pricing | Low-latency video, voice and AI-agent APIs for developers | [.md](https://openaitools.app/tool/video-sdk.md) |
| 10 | [Synthflow.ai](https://openaitools.app/tool/synthflow-ai) | 95,542 | -7.6% | Free Trial, Contact for Pricing | Enterprise AI voice agents that work inside your phone system | [.md](https://openaitools.app/tool/synthflow-ai.md) |

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

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