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Catalogue

Signal

Working

A MIDI sequencer that opens in a tab and needs no install

What it's for

  • sketch a MIDI idea without opening a DAW
  • edit a multi-track piano roll on a machine with nothing installed
  • write out a melody you need to send to someone else
Show 1 more
  • arrange parts for several instruments in a browser tab
2.4k GitHub starsPushed Runs in the browser156 checksMusic and audioVercel
Open SignalSourceChecked signalmidi.appLast change recorded

We have checked Signal 156 times since 14 Sept 2026, and it answered every time. Its visible text has not changed since we started watching.

What it does

An open-source MIDI editor with a piano roll, arrangement view and instrument tracks, running in the browser. Useful for sketching an arrangement, or opening a MIDI file when the machine in front of you has no sequencer on it.

Others that do this

Each answered its most recent check.

Looking for something else?

What stands out

  • No account required
  • Free
  • Source is public

What we checked

  • App accessible

    The last check reached a working page.

  • Page rendered

    The last browser pass found an empty shell.

  • Screenshot kept

    We captured a picture of the page.

  • Looked at by an agent

    An agent opened the live site after the automated probe called it empty. The product paints. The probe had hit a bot check, not an empty page.

Looked
7

7 browsers

Opened
27

27 browsers

Checks
156

156 checks

Watching
0

Nobody yet

Browsers on this site, not verified people.

Screenshot of Signal
Screenshot from our last capture

Development

9 snapshots kept

Active

Commits landed in the last 90 days.

+20 stars since we started watching.

Evidence

Each bar is one request we made
Checks
156
Working · last 40
100%
Median response
106ms
Watching since
14 Sept 2026

Of the last 40 checks, 40 answered (100%); the latest was on . Median response 106 ms. Watching since .

Browser render check

Checked 1 month ago in a real browser

0 of 1 page rendered

How the browser check works

Activity

Watching since
Last content change
None seen yet
Unchanged for
48 days
Certificate expires
in 31 days

How it looked

  1. 1 month ago

  2. 1 month ago

  • Went from slow to live1 month ago
  • Went from live to slow1 month ago
  • The browser render check changed1 month ago
  • Now redirects to https://signalmidi.app/1 month ago
  • Its embedding policy changed1 month ago

How we track changes

What people say

No reviews yet.

Embed this status

For a README. It updates on every check.

Signal — still works
[![Signal — still works](https://itstillworks.app/api/badge/signal-midi)](https://itstillworks.app/verify/signal-midi)