head to head · open source
oomwoo vs EMS-ESP32
oomwoo has 12,941 GitHub stars, 814 forks, 3 open issues and last shipped yesterday. EMS-ESP32 has 1,053 stars, 159 forks, 15 open issues and last shipped yesterday. oomwoo leads on adoption by 1,129% (12,941 vs 1,053 stars). oomwoo is written in Python under Apache-2.0; EMS-ESP32 is written in C++ under LGPL-3.0. oomwoo has attracted 6% as many forks as stars, EMS-ESP32 15%. EMS-ESP32 was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (esp32, home-assistant), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| oomwoo | EMS-ESP32 | |
|---|---|---|
| GitHub stars | ★ 13K | ★ 1.1K |
| License | Apache-2.0 | LGPL-3.0 |
| Written in | Python | C++ |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 814 | ⑂ 159 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick oomwoo if
- You weight community size — 13K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick EMS-ESP32 if
- You want the EMS-ESP32 feature set and don't need the biggest community
- You prefer the LGPL-3.0 license terms
- Your stack matches C++
- You evaluated both and EMS-ESP32 fits your workflow better
About oomwoo
OOMWOO Open source robot vacuum you build yourself Clean well · Hackable · Raspberry Pi · 3D printed · Local / No cloud required · Home Assistant · Arduino · ROS2 · ESP32 OOMWOO is an open source home robot vacuum you can build yourself, built using Raspberry Pi, 3D printing, Home Assistant, Arduino and ROS2. It uses an affordable 2D LiDAR to map your home and navigate on its own. Local, no cloud required for regular functionality, no vendor lock in. Follow us building in public Discord X Instagram Facebook Reddit newsletter YouTube oomwoo.com Tutorials Early build instructions will be available in Fall 2026…
read the full oomwoo overview →
About EMS-ESP32
EMS ESP EMS ESP is an open source firmware for the Espressif ESP32 microcontroller to communicate with EMS (Energy Management System) compatible equipment from manufacturers such as Bosch, Buderus, Nefit, Junkers, Worcester, Sieger, elm.leblanc and iVT. It requires a small circuit to interface with the EMS bus which can be purchased from . These gateways are tested thoroughly and certified to work with EMS ESP. 📦 Key Features Compatible with EMS, EMS+, EMS2, EMS Plus, Logamatic EMS, Junkers 2 wire, Heatronic 3 and 4 Supporting over 120 different EMS compatible devices such as thermostats, boilers, heat pumps…
read the full EMS-ESP32 overview →
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Frequently asked questions
Is oomwoo or EMS-ESP32 more popular?
oomwoo has 12,941 GitHub stars and EMS-ESP32 has 1,053. oomwoo has the larger community by that measure.
Are oomwoo and EMS-ESP32 free?
Both are open source. oomwoo is licensed under Apache-2.0 and EMS-ESP32 under LGPL-3.0. Neither carries a licence fee.
What is the difference between oomwoo and EMS-ESP32?
oomwoo is written in Python and EMS-ESP32 in C++. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, oomwoo or EMS-ESP32?
Choose oomwoo if you want the larger community (12,941 stars) or its Apache-2.0 licence terms. Choose EMS-ESP32 if its feature set, stack or LGPL-3.0 licence fits better. Both are self-hostable.