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MicroPython Support Tiers

MicroPython operates with a set of Support Tier levels for the various ports. Tiers 1, 2 and 3 are the main Tier levels with Tier 1 being the most mature and actively maintained. There is also Tier M for additional ports used primarily for maintenance, development and testing. These Tier levels are defined in the table below.

	Tier 1	Tier 2	Tier 3	Tier M
builds pass under CI	✔	✔	✔	✔
tests run under CI (where possible)	✔	✔	✔	✔
actively maintained	✔	✔		✔
stable Python API	✔	✔
new features actively developed	✔	✔
tested on hardware for releases	✔	✔
prioritized bug reports	✔			✔
regressions warrant a patch release	✔			✔
has port-specific documentation	✔

Lower Tiers may tick more boxes, but the above table defines the minimum requirements for a port to belong to a Tier.

Tier 1 ports:

• esp32

• mimxrt

• rp2

• samd

• stm32

• unix

• windows

Tier 2 ports:

• alif

• embed

• nrf

• renesas-ra

• webassembly

• zephyr

Tier 3 ports:

• cc3200

• esp8266

• pic16bit

• powerpc

Tier M ports:

• bare-arm

• minimal

• qemu