This is a learning platform for musical rhythm.

It's free, web based, and includes:

  1. Many Rhythm Trainers.
  2. A Rhythm Generator, a Metronome, Ploop and other tools.
  3. Teacher-Student support.

The trainers aim to be quick and easy to use. Match sounds, words and notes in many ways. Configure tempo, instrument and more. Tap out rhythms.

Great for beginner music students.

All tools should work well on mobiles and tablets.

I've been learning piano, and was inspired to improve on the existing rhythm tools. I'd love to hear your feedback.

Hope you enjoy,


4four.io is just starting out, but I'm trying to do all the right things :)

The site uses cookies for basic functionality like login and form security. On the browser side only IDs are stored in the cookie. And on the server side the cookie info is never saved to disk.

If you register an account via email, then the server stores the email address. If you log in using Google, then your "display name" and Google account ID are stored.

If you are logged in, then information is stored about all the exercises that you complete, for the Progress page.

If you are logged in then you can connect to one or more teachers. These teachers are able to see your name and all your scores and badges. If you logged in via email you'll have to additionally enter your name before connecting to any teachers. This name is stored on disk, in the same way your email address is stored.

The stand alone tools also store all their settings in the browser's indexed DB. These tools are intended to be used only by the Android apps. Their URL pathnames begin with "/lone/" and they are not reachable from any page of the site.

The server stores access and error information to disk. These logs may include IP addresses. The log files are temporary, and are not backed up off site.

Daily total trainer runs are recorded. These are aggregates and so are not linked to any users in any way. You can see this info here.

Privacy Policy

Your privacy is important to us. It is 4four.io's policy to respect your privacy regarding any information we may collect from you across our website, https://4four.io, and other sites we own and operate.

We only ask for personal information when we truly need it to provide a service to you. We collect it by fair and lawful means, with your knowledge and consent. We also let you know why were collecting it and how it will be used.

We only retain collected information for as long as necessary to provide you with your requested service. What data we store, we'll protect within commercially acceptable means to prevent loss and theft, as well as unauthorized access, disclosure, copying, use or modification.

We dont share any personally identifying information publicly or with third-parties, except when required to by law.

Our website may link to external sites that are not operated by us. Please be aware that we have no control over the content and practices of these sites, and cannot accept responsibility or liability for their respective privacy policies.

You are free to refuse our request for your personal information, with the understanding that we may be unable to provide you with some of your desired services.

Your continued use of our website will be regarded as acceptance of our practices around privacy and personal information. If you have any questions about how we handle user data and personal information, feel free to contact us.

This policy is effective as of 6 June 2020.

Privacy Policy created with GetTerms.


Thanks to Bonnie Woolie and her students for early feedback and encouragement. Check out Bridging21, the learning site she is developing.

Many of the icons are from SVGRepo. They have a big selection of clean, free-to-use vectors.

The 404 character is a modification of one of Kenney's characters. Kenney has produced a huge number of public domain game assets.

4four.io's social media banner is based on a photograph by Amir Doreh on Unsplash.

The songs used in the Player and Tap The Beat are all public domain, from Mutopia, FreePD.com, OpenGameArt.org and the Digital Tradition Folk Music Database.

And of course 4four.io depends on lots of Free and Open Source Software!