BeepBox

A small browser studio for instrumental ideas

BeepBox is a free online tool for sketching and sharing instrumental music. Its grid-based editor lets a composer place notes, hear them immediately and arrange repeating patterns into a longer piece. It is particularly approachable for short electronic, chiptune and game-style ideas, while its channels and editing controls also make it useful for experimenting with melody, harmony and rhythm without setting up a full digital audio workstation.

Build a piece one pattern at a time

Notes are entered by clicking or dragging on the editor grid. A pattern can contain notes of different lengths, and additional notes can be placed together to make chords. Song sections are assembled from numbered patterns: choose a pattern for each part, move between sections and reorder or copy patterns as the arrangement develops. Multiple rows can play at once, so melodies and harmonies can sit alongside a dedicated drum row. A movable loop marks the section that repeats during playback, which helps when testing a groove or revising a transition.

BeepBox also includes direct editing gestures for duration, pitch bends and note volume. Keyboard controls support play and pause, undo and redo, moving selections and copying patterns. The menus on the side expose further sound, rhythm and song settings, so a new user can start with the note grid and explore additional controls as needed.

Save and share a song through its link

The arrangement and song data are encoded in the page URL. As the music changes, the URL updates; copying it preserves that version and lets another person open and hear the same sketch. This link-based approach means there is no account-based project library to manage. Keep a copy of the link for each version you want to revisit, since a later edit changes the URL.

The project’s information page says songs are not received, recorded or distributed by BeepBox’s servers and that user-created original songs remain their authors’ work. The creator does not claim ownership of those compositions. Users remain responsible for material they enter or share, including music that may belong to someone else.

Use it online or offline

BeepBox runs in a modern web browser and is presented as a passion project that is free to use; optional gratuities support its developer. An offline version can be downloaded for composing without an internet connection, with the same editing features. The site also provides older versions for people who need to reopen a project made with a previous release and offers the source code under the MIT licence for developers who want to study or reuse the synthesiser code under its terms.

For a first session, place a few notes in one pattern, press play, then add a second channel and a repeating section. Once the idea works, save the updated URL. This simple workflow makes BeepBox a practical starting point for drafting a soundtrack, sharing a musical sketch or learning how loops and patterns form a short arrangement.