Alternatives

Products that do what MidiCard, a credit card-sized PCB MIDI Keyboard does

This is a product I designed and the software is open source.

1. 1OP
   OpenDeck – Platform for building MIDI controllers▲47

   2021 · github.com

2. 2IM
   I made a tiny device for automatically recording digital pianos▲590

   Hey HN! A few years ago, I left my cushy big tech job to make hardware. And made the device I always wanted - an automatic piano recorder! I usually play piano improvisationally, and manually hitting record never meshed well with that. But there are always moments I wish I recorded, and now they are! Hopefully it scratches a similar itch for some of you as well! A few of the tech details: * built on an esp32-s3 * custom injection molded enclosure * BLE comms, sd card storage, DS1302 RTC * android & ios apps with Flutter * Shadertoy vfx support for video sharing - Chip

   2024 · jamcorder.com

3. 3FO
   Fully Open-Sourced Online MIDI Editor▲93

   2020 · signal.vercel.app

4. 4BW
   BitMidi – Wayback machine for old-school MIDI files▲168

   2018 · bitmidi.com

5. 5IM
   I made a MIDI tool to teach me piano▲94

   2022 · github.com

6. 6AP
   A platform for remote piano lessons based on the Web MIDI API▲224

   I'm building a video conferencing app designed to facilitate better remote piano lessons. My hope is to solve a lot of the challenges piano tutors and new students deal with when taking lessons through Skype/Zoom. It leverages WebRTC's data transmission to send media, MIDI state, and (eventually) send sheet music files and other musical data. I'm surprised with how well the MVP has worked and would love to hear any feedback or suggestions!

   2024 · keyboardconnect.com

7. 7PT
   Piano Trainer – Learn piano scales, chords and more using MIDI▲203

   2025 · github.com

8. 8PT
   Piano Trainer – Learn piano scales, chords and more using MIDI▲159

   2022 · github.com

9. 9AT
   A tiny portable MIDI looper▲35

   2020 · beeplab.one

10. 10MA
    Musikcube, a terminal-based music player, library, and streaming server▲340

    2017 · musikcube.com

11. 11MA
    Miditui – A terminal app/UI for MIDI composing, mixing, and playback▲66

    Jan 2026 · github.com

12. 12PB
    Perfect Bluetooth MIDI for Windows▲105

    Hi HN, I'm Erwin. I built a small free open-source utility that bridges Bluetooth LE MIDI keyboards into the new Windows MIDI Services stack so any DAW or Web MIDI app can use them as if they were wired. I bought a Roland FP-90X piano partly because it had Bluetooth MIDI. On my Windows 11 PC, pairing succeeded, but my DAW couldn't see the keyboard, and notes I sent from the PC never made the piano sing. After a regrettable number of evenings, I'd separated this into three independent bugs stacked on top of each other. The first one is the famous one: Windows only natively exposes BLE-MIDI…

    May 2026

13. 13MT
    Midibin – Turn Clojure code into MIDI music▲48

    2018 · midibin.com

14. 14PK
    PunchCard Key Backup▲148

    2025 · github.com

15. 15
    MIDIGEN: Melody Generator▲134

    Royalty-Free MIDI melody generator

    2024

16. 16
    Flowkey▲163

    The easiest way to learn piano

    2014

17. 17CC
    Controllers.cc – Compare midi controllers and small keyboards▲8

    2014 · controllers.cc

18. 18MD
    MIDI Database, an open source library of MIDI implementations▲18

    2024 · github.com

19. 19M2
    MidiPad 2 – A customizable Midi Pad Controller▲47

    2017 · midipadapp.com

20. 20AA
    Ansiwave, an ANSI art and MIDI music mashup▲103

    2021 · github.com

21. 21
    Karabiner▲80

    Awesome, powerful keyboard remapper for OSX.

    2014

22. 22WA
    Warp, a Python based music-theory aware MIDI sequencer▲98

    2020 · warpseq.com

23. 23
    Seaboard GRAND▲74

    Radical Musical Keyboard: completely new type of instrument

    2014

24. 24TZ
    The ZynAddSubFX open source musical synthesizer▲53

    2018 · zynaddsubfx.sf.net

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