cantools
CAN BUS tools.
Decision gist · record as of 2026-08-14
Yes. Cantools is well-maintained, actively developed, carries no security vulnerabilities, and has low install friction. It is the standard choice for CAN bus work in Python and covers the full workflow from database parsing through encoding, decoding, and visualization. Install it if you work with automotive CAN systems, vehicle diagnostics, or need to process CAN bus captures.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python >= 3.10.
- Optional matplotlib dependency for plot subcommand must be installed separately with cantools[plot].
- Low friction: pure Python wheel with five straightforward runtime dependencies.
License · maintenance · safety
MIT (permissive) — MIT license (permissive) places no restrictions on use, modification, or distribution in proprietary or open-source projects.
last release 2026-07-05 (40 days) · last repo commit 2026-08-14 · 2,267 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,193,654 downloads/mo, #4,235 on PyPI
Alternatives
Verify before relying
pip install cantools
import cantools
db = cantools.database.load_file('motohawk.dbc')
message = db.get_message_by_name('ExampleMessage')
data = message.encode({'Temperature': 250.1, 'Enable': 1})
decoded = db.decode_message(message.frame_id, data)- Whether the C source code generator is production-ready or primarily for reference.
- Performance characteristics when handling large or complex ARXML files.
- Extent of support for ARXML 3 vs. ARXML 4 features and known limitations.
What it is and what it does
Cantools is a Python library for working with CAN (Controller Area Network) bus systems, primarily used in automotive applications. It reads and parses multiple database formats—DBC, KCD, SYM, ARXML 3 & 4, and CDD—that define the structure of CAN messages and signals. Once a database is loaded, the library provides high-level APIs to encode Python dictionaries into raw CAN frame bytes and decode incoming CAN frames back into human-readable signal values, handling both simple and multiplexed signals automatically.
Beyond the core encode/decode functionality, cantools includes command-line tools for real-world CAN bus work: a decoder that parses candump output (the standard Linux CAN capture format), a monitor for live bus observation, a plotter that visualizes signal values over time using matplotlib, and a C code generator for embedded systems. The library depends on bitstruct for bit-level manipulation, python-can for bus communication, textparser for format parsing, argparse_addons for CLI extensions, and crccheck for diagnostic frame validation.
Use it for
- Decode candump logs from vehicle testing or diagnostics without manual frame parsing.
- Build Python scripts to send and receive CAN messages on a test bench or simulator.
- Parse automotive ARXML or DBC files to extract message and signal definitions for documentation or code generation.
- Implement diagnostic DID (Data IDentifier) encoding/decoding for vehicle communication protocols.
- Monitor live CAN bus traffic and plot signal trends for debugging or validation.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Cantools is well-maintained, actively developed, carries no security vulnerabilities, and has low install friction. It is the standard choice for CAN bus work in Python and covers the full workflow from database parsing through encoding, decoding, and visualization. Install it if you work with automotive CAN systems, vehicle diagnostics, or need to process CAN bus captures.
Install
cantools on PyPI
Before you install
Low friction: pure Python wheel with five straightforward runtime dependencies. Actively maintained with a recent release; last commit 2026-08-14 and 2267 repository stars indicate steady development.
Requires Python >= 3.10. Optional matplotlib dependency for plot subcommand must be installed separately with cantools[plot].
License in practice
MIT license (permissive) places no restrictions on use, modification, or distribution in proprietary or open-source projects.
Quickstart
pip install cantools
import cantools
db = cantools.database.load_file('motohawk.dbc')
message = db.get_message_by_name('ExampleMessage')
data = message.encode({'Temperature': 250.1, 'Enable': 1})
decoded = db.decode_message(message.frame_id, data)Verify before relying
- Whether the C source code generator is production-ready or primarily for reference.
- Performance characteristics when handling large or complex ARXML files.
- Extent of support for ARXML 3 vs. ARXML 4 features and known limitations.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 5 packagesbitstructpython-cantextparserargparse_addonscrccheck |
| Maintenance | Actively maintained 40 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 1,193,654 / month, #4,235 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: MIT License |
Evidence: cantools-42.0.3-py3-none-any.whl
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See also canmatrix · odxtools · ldfparser · powertrain-build · python-can · asammdf · vcdvcd · udsoncan · autosar-data · canopen