After installing new firmware, Trådfri outlets can be added to the Home app and controlled alongside the rest of your HomeKit products.
Ikea sells the Trådfri smart plugs for just $9.99, which is much cheaper than other HomeKit-enabled smart plug options on the market. You will, however, need the accompanying Trådfri Gateway, a $30 hub that is required for all of Ikea's affordable smart home solutions including light bulbs, dimmers, motion sensors, and more.
The Trådfri outlets are larger than some other HomeKit-based outlets, but can be used sideways and will only take up a single socket. Multiple Trådfri accessories can be connected to the Trådfri Gateway.
You can get the Trådfri smart plugs and the Trådfri Gateway from Ikea. Ikea is rolling out its new software update and it should be available to customers in the U.S. now before expanding to other countries in the near future.