# Ultravox review (2026): is it worth $100 a month, billed yearly? > Speech-native voice AI platform and API for building voice agents Checked Nov 13, 2026 ยท graded Nov 13, 2026 by ToolGPA. Ultravox is a voice AI platform whose speech-native model takes in audio directly instead of converting speech to text first. Developers build agents through REST APIs and SDKs for web and mobile, with telephony support. The vendor's site says Ultravox has been acquired by Inworld. - **Category:** AI Agents - **Made by:** Fixie.ai - **Website:** https://www.ultravox.ai - **Runs on:** Web - **Who should skip it:** Not for you if you want a no-code builder: it is APIs and SDKs. - **Facts last checked:** Nov 13, 2026 ## Pricing As of Nov 13, 2026, Ultravox is a paid product with a free trial, starting at $100 per month, billed yearly. - **Pricing model:** Free trial - **Free plan:** None. - **Free trial:** First 30 minutes of calls free, then $0.05 per minute on Pay as You Go. | Plan | Price | What you get | | --- | --- | --- | | Pay as You Go | $0 per month, plus $0.05 per minute | 30 free minutes, then 5 cents a minute; up to 5 concurrent calls and 2 RAG corpora. | | Pro | $100 per month, billed yearly | No hard cap on concurrency, outbound call scheduler, 5 custom voices and 20 RAG corpora. | | Enterprise | Custom | Priority SLA, org support and customizable limits. | Read from https://www.ultravox.ai/pricing on Nov 13, 2026. Prices change, so confirm with Ultravox before buying. ## Key features - **Speech-native model:** Processes audio directly so tone and cadence are not lost in transcription, and the vendor runs its own inference stack. - **REST APIs and SDKs:** Developer APIs plus kits for web and mobile platforms. - **Telephony:** Built-in telephony support, with SIP calls priced from about half a cent per minute. - **Outbound call scheduler:** Schedules outbound calls; available on Pro and Enterprise. - **RAG corpora:** Attach knowledge corpora to an agent: 2 on Pay as You Go and 20 on Pro. ## Good for - Developers building voice agents who want a per-minute price - Teams that want a speech-native model rather than a speech-to-text pipeline ## Worth knowing - The site announces that Ultravox has been acquired by Inworld; future plans and pricing may change. - The pricing page marks prices as an annual rate; a monthly-billed price is not shown. - Pay as You Go is capped at 5 concurrent calls. - Threads pricing is $2.00 per 1M uncached input tokens and $15.00 per 1M output tokens. ## ToolGPA grades **GPA: 1.6 out of 4**, graded Nov 13, 2026. Ultravox is a speech-to-speech voice model with APIs and SDKs for developers building phone agents. The first 30 minutes of calls are free, then it is $0.05 a minute, but the company was acquired by Inworld and says plans and pricing may change. - **Value for money: C.** Pay as You Go is $0.05 a minute and Pro is $100 a month billed yearly, between the category's $50 dearer-quarter and $150 dearest-tenth lines. - **Free plan and trial: D.** The first 30 minutes of calls are free. That is a short taste, not a plan. - **Features: C.** A speech-native model, APIs and SDKs, telephony, an outbound scheduler and retrieval corpora. It is a building block, so you build the product around it. - **Ease of use: D.** You need to write code against REST APIs and SDKs, and no store rating exists. - **Platforms and integrations: C.** Web, with APIs and SDKs. No integrations are listed. These are ToolGPA's own grades. Graded from this listing, whose facts were read from Ultravox's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among AI agents - Ultravox's GPA of 1.6 is higher than 0 of the 178 other AI agents we grade, and level with 29. - It stands best on value for money (C, above 28 of 178) and worst on ease of use (D, above 0). - Its paid plans start at $100 a month, against a middle price of $25 for the category: 85 of the 98 others that charge start lower. - On features, ease of use and platforms it scores 1.7 out of 4. 89 tools score higher and cost less. The category's chart of price against score: https://toolgpa.com/charts/ai-agents ## Keep it, or make your own? **Keep it.** To replace Ultravox you would be making an AI agent, with the models and the safeguards behind it. That is not a weekend's work, with an AI app builder or without one. That makes this kind of software worth paying for, not this one in particular: 149 of the 178 other AI agents grade higher. It costs $1,200 a year. - You could not: An AI agent, with the models and the safeguards behind it. - You could not: A voice model trained on your recordings. - You could not: An API that other software can build on. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. **Tags:** AI agents, Public API, Voice cloning ## Alternatives - [Vapi](https://toolgpa.com/tools/vapi): Developer platform for building and running voice AI agents. [Compare](https://toolgpa.com/compare/ultravox-vs-vapi) - [Retell AI](https://toolgpa.com/tools/retell-ai): Pay-per-minute platform for AI phone and chat agents. [Compare](https://toolgpa.com/compare/retell-ai-vs-ultravox) - [LiveKit Agents](https://toolgpa.com/tools/livekit-agents): Open source framework and cloud for voice and video AI agents. [Compare](https://toolgpa.com/compare/livekit-agents-vs-ultravox) - [Pipecat](https://toolgpa.com/tools/pipecat): Open source framework for building voice and multimodal AI agents. [Compare](https://toolgpa.com/compare/pipecat-vs-ultravox) - [Bland AI](https://toolgpa.com/tools/bland-ai): AI phone agents with one all-in per-minute rate. [Compare](https://toolgpa.com/compare/bland-ai-vs-ultravox) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 13, 2026: - https://www.ultravox.ai/pricing - https://www.ultravox.ai Page: https://toolgpa.com/tools/ultravox Listed by ToolGPA (toolgpa.com).