about us 👋️

Build voice applications for your business, today.

  • feature-icon


    Voice Applications are first-class citizens with supports for verbs like Play, Say, Gather, etc.

  • feature-icon


    Keep your business safe with project-level authentication based in OAuth2 and JWT tokens.

  • feature-icon


    Store, organize, and serve your sounds on S3 buckets and user them later for analysis.

Install from NPM or CDN

Use the SDKs in the Browser or NodeJS application


User the command-line tool to rapidly create and deploy your applications.

Google Speech APIs

Unlock Text-to-Speech and Automatic Speech Recognition potential in your apps.

capabilities 🛠️

The SDKs and tooling to help build your apps, faster.

Create smart voice applications that meets your business needs without the clutter of unneeded features or historically burdensome customixations.

const { VoiceServer } = require("@fonoster/voice");
const serverConfig = {
  pathToFiles: `${process.cwd()}/sounds`,

new VoiceServer(serverConfig).listen(
  async (req, res) => {
    const sound = `sound:${req.selfEndpoint}/sounds/hello-world.sln16`
    await res.answer();
    await res.play(sound);
    await res.hangup();

// your app will leave at
// and you can easily publish it to the Internet with:
// ngrok http 3000

const Fonoster = require("@fonoster/sdk")
const callManager = new Fonoster.CallManager()
// Replace the webhook with the one from your Ngrok
from: "9842753574",
to: "17853178070",
webhook: "https://5a2d2ea5d84d.ngrok.io"

community 🥳

Join our amazing community of contributors.

Supported by a growing community of advocates, contributors, and heroes.

pricing 💸

Simple, straight-forward pricing.



Rate-limited plan for quickly and easily learning and standing up a prototype app.

  • 1 Project
  • 1 Domain
  • 4k/mo Calls
  • 1GB Storage
  • 1-week log retention
  • Community support



Perfect for small and medium businesses with applications going into production.

  • 10GB Storage
  • Unlimited Projects
  • Unlimited Domains
  • 120k/mo Calls
  • 30-day log retention
  • Email support



The highest level of security, regulatory compliance, performance, and scalability.

  • Technical support with SLAs
  • Volume commitment pricing
  • Technical onboarding
  • Single Sign-On (Coming Soon)
  • Customer Success Manager

testimonials 🥰

What our people are saying about us.

“The one and only cloud-first SIP server!”


I came across Routr, which seems to be the one and only cloud-first Kubernetes-ready SIP server on the planet!

Jessie Wadman, Camanio AB

“Awesome community!”


I really love this community and I will like to be a contributor. I am currently working on some use cases with Fonoster.

AlijiEmmanuel-dev, GitHub Discussions

“Rock on!”


Heya pedro! just came across this project in the last hour but love everything about it on first pass

beckerchase, GitHub Discussions


Ready to engage your clients better and faster?

Try us out and start building for free.

FAQs 🤔

Questions? We’ve got answers.