The Ultravox Insider’s Guide
Everything we know about Ultravox in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Ultravox
The Insider’s Guide
Speech-native voice AI platform and API for building voice agents
Every plan, grade, refund rule and rival among AI agents, read from Ultravox’s own pages.
Made by Fixie.ai · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Ultravox’s own pages, its app-store listings and our grades. Every fact in it is on Ultravox’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
1.6
GPA, above 0 of the 178 other AI agents we grade
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.
To get you started, here are 9 things to know about Ultravox, taken from its own pages and our grades.
You need to write code against REST APIs and SDKs, and no store rating exists.
- 1
Best for developers building voice agents on one speech model
Ultravox is a speech-to-speech voice model with APIs and SDKs for developers building phone agents.
- 2
Paid plans start at $100 a month
As its pricing page puts it: $100 per month, billed yearly.
- 3
You can try it first
First 30 minutes of calls free, then $0.05 per minute on Pay as You Go
- 4
It runs on Web
Web.
- 5
Speech-native model
Processes audio directly so tone and cadence are not lost in transcription, and the vendor runs its own inference stack.
- 6
REST APIs and SDKs
Developer APIs plus kits for web and mobile platforms.
- 7
Telephony
Built-in telephony support, with SIP calls priced from about half a cent per minute.
- 8
A 1.6 GPA, above 0 of 178
That is against the other AI agents we grade, on value, the free plan, features, ease of use and platforms.
- 9
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.
Ultravox at a glance
- Pricing
- Free trial, from $100 per month, billed yearly
- Free plan
- No
- Free trial
- First 30 minutes of calls free, then $0.05 per minute on Pay as You Go
- Runs on
- Web
- Made by
- Fixie.ai
- Category
- AI Agents
- Our grade
- 1.6 GPA, weak
The report card
Best for developers building voice agents on one speech model
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.
| Subject | Grade | Comment |
|---|---|---|
| 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. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Ultravox is for
- Fits if you are a developer who wants one model that listens and speaks
- Makes sense if you will pay by the minute and build your own call flow
Who it is not for
- Not for you if you want a no-code builder: it is APIs and SDKs
- Watch out: the site says Ultravox has been acquired by Inworld, and plans and pricing may change
- Tight if you scale on Pay as You Go: it is capped at 5 concurrent calls
- Watch out: the pricing page marks prices as an annual rate and shows no monthly-billed price
Good to know
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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$100
A month to start
Ultravox is a paid product with a free trial, starting at $100 per month, billed yearly.
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.
Trying it first
First 30 minutes of calls free, then $0.05 per minute on Pay as You Go
Read from ultravox.ai on Nov 13, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Speech-native voice AI platform and API for building voice agents. Here is what it does, as its own site describes it, and what it covers: public API, AI agents, voice cloning.
A speech-native model, APIs and SDKs, telephony, an outbound scheduler and retrieval corpora.
- 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.
Where it runs
- Web
What it works with
Its own pages name no integrations.
Ultravox is made by Fixie.ai.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
0/178
Other AI agents it is graded above
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.
Each grade against the category
Every bar is all 179 AI agents we grade, cut by the letter each got. Ultravox’s own letter is outlined.
- CValue for moneyAbove 28 of 178
- DFree plan and trialAbove 55 of 178
- CFeaturesAbove 2 of 178
- DEase of useAbove 0 of 178
- CPlatforms and integrationsAbove 0 of 178
Price against what you get
Each dot is one of 109 AI agents. Further left costs less; higher up scores better on features, ease of use and platforms. Ultravox is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
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.
What you could not
- An AI agent, with the models and the safeguards behind it.
- A voice model trained on your recordings.
- An API that other software can build on.
What this rests on. Ultravox’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Vapi, Retell AI, LiveKit Agents, Pipecat and Bland AI
The 5 tools Ultravox is most often weighed against, with where each one differs from it.
- 2.2GPA
Vapi
Free trial · from $29/mo
Developer platform for building and running voice AI agents.
- Ultravox also covers voice cloning.
- 2.4GPA
Retell AI
Free trial · from $0
Pay-per-minute platform for AI phone and chat agents.
- Ultravox also covers voice cloning.
- Retell AI also covers chatbots.
- 2.2GPA
LiveKit Agents
Free plan · from $50/mo
Open source framework and cloud for voice and video AI agents.
- LiveKit Agents has a free plan. Ultravox does not, though it has a free trial.
- LiveKit Agents is open source, according to its own site.
- Ultravox also covers voice cloning.
- 2.2GPA
Pipecat
Free plan
Open source framework for building voice and multimodal AI agents.
- Pipecat has a free plan. Ultravox does not, though it has a free trial.
- Pipecat is open source and self-hostable, according to its own site.
- Ultravox also covers voice cloning.
- 2.2GPA
Bland AI
Free trial · from $0
AI phone agents with one all-in per-minute rate.
- Ultravox also covers voice cloning.
- Bland AI also covers chatbots.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
12
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Ultravox free?
No, Ultravox is a paid product, but you can try it first. First 30 minutes of calls free, then $0.05 per minute on Pay as You Go.
How much does Ultravox cost?
Ultravox lists 3 plans. Pay as You Go: $0 per month, plus $0.05 per minute.
What platforms does Ultravox work on?
Ultravox is available on Web.
Does Ultravox have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. Ultravox is listed for Web.
Does Ultravox have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. Ultravox is listed for Web.
Is Ultravox open source?
Ultravox is not described as open source on its own site, as read on Nov 13, 2026.
Does Ultravox have an API?
Yes. Ultravox offers a public API, according to its own site.
Who makes Ultravox?
Ultravox is made by Fixie.ai.
What are the alternatives to Ultravox?
The closest alternatives to Ultravox in our directory are Vapi, Retell AI, LiveKit Agents, Pipecat and Bland AI.
How does Ultravox compare with other AI agents?
Ultravox's GPA of 1.6 is higher than 0 of the 178 other AI agents we grade, and level with 29.
Is Ultravox good value for money?
ToolGPA grades Ultravox C for value for money. 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.
Could I make my own version of Ultravox?
To replace Ultravox you would be making an AI agent, with the models and the safeguards behind it.
Where this guide comes from
The prices, plans, platforms and features were read from Ultravox’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. 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.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Fixie.ai. Prices change, so check ultravox.ai before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Ultravox, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/ultravox
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Ultravox: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/ultravox
Know someone choosing between AI agents?
Send them this guide: toolgpa.com/tools/ultravox/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded AI agents after Ultravox, each with an Insider's Guide of its own.
- AI Agents Insider's GuideEvery one of the 179 AI agents we grade, compared
- Genspark Insider's GuideAI workspace with an agent for research, slides, sheets and docs3.2 GPA
- Manus Insider's GuideGeneral AI agent for research, slides, websites and browser tasks3.2 GPA
- OpenClaw Insider's GuideOpen-source personal AI agent you run yourself and message in chat3.2 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Ultravox’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Ultravox is a trademark of its owner, and this guide is not made, paid for or approved by Fixie.ai. Prices and plans change: check ultravox.ai before you buy.