Roku Express 4K (3940) vs Roku Ultra (2024)

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Express 4K (3940) compared with Ultra (2024)

	RokuExpress 4K (3940)	RokuUltra (2024)
Overview
Released
Released	May 2021	September 2024
Video and audio
Resolution
Resolution	4K	4K
HDR
HDR	HDR10, HDR10+ and HLG	Dolby Vision, HDR10+, HDR10 and HLG (better)
Dolby Atmos
Dolby Atmos	–	Yes
Video
Video	Up to 4K at 60 fps (Roku's exact Marlin/3940X developer row); HDCP 2.2 required for 4K/HDR	Up to 2160p at 60 fps (3840 × 2160) with up-scaling from 720p and 1080p; HDMI Quick Media Switching (QMS); AV1, HEVC, H.264 and VP9 from USB
HDR
HDR	HDR10, HDR10+ and HLG (Roku's exact Marlin/3940X developer row); no Dolby Vision	Dolby Vision at 60 fps, HDR10, HDR10+ and HLG
Audio
Audio	–	Dolby Atmos decode via HDMI; DTS Digital Surround pass-through; AC-4 and DD+ with Atmos, FLAC, ALAC and other formats from USB
Performance
Software
Software	Roku OS	Roku OS
Chip details
Chip details	Arm Cortex-A55; OpenGL ES 2.0 (Roku's exact Marlin/3940X developer row)	Quad-core Arm Cortex-A55; Roku quotes over 30% faster than other Roku players
Memory
Memory	1 GB (Roku's exact Marlin/3940X developer row)	2 GB
Storage
Storage	Internal storage serves system/channel use; maker sources used do not publish user-accessible capacity	–
Software and services
Software and services	Launched with Roku OS 10. App availability varies by region and software version. May 2021 on-sale month is from the exact UK Tech Advisor review; the maker developer table gives only 2021. Cord Busters identifies this model as the UK replacement for Premiere 3920	–
Connections
Wi-Fi
Wi-Fi	Wi-Fi 5	Wi-Fi 6
Ethernet
Ethernet	No	Yes
Voice remote
Voice remote	No	Yes
Ports
Ports	HDMI output, micro-USB power/compatible Ethernet adaptor connection and reset. No built-in Ethernet socket; USB Ethernet adaptor sold separately	HDMI 2.1b; USB 3.0; 10/100 Ethernet; power
Wi-Fi and Bluetooth
Wi-Fi and Bluetooth	Dual-band 802.11ac Wi-Fi (Tech Advisor)	802.11ax dual-band MIMO Wi-Fi 6 (2.4 GHz and 5 GHz); Bluetooth audio streaming
Smart home
Smart home	–	Works with Roku Smart Home, Apple AirPlay and HomeKit, Google Home and Alexa
Remote
Remote	Original standard infrared remote with channel shortcuts; no microphone, television power/volume controls or headphone socket. Express 4K+ 3941 includes the voice remote instead	Roku Voice Remote Pro (2nd edition) with hands-free voice, backlit buttons, TV power and volume, Quick Launch and Live TV Guide buttons, lost-remote finder; rechargeable over USB-C
Design
Type
Type	Box	Box
Power
Power	USB power cable and mains adaptor supplied; use the adaptor if the television USB port provides insufficient power	12 V, 1.5 A power adaptor; about 4.5 W when streaming 4K
Size
Size	–	124.4 × 127.0 × 25.4 mm; 167.2 g
In the box
In the box	Player, infrared remote, batteries, premium high-speed HDMI cable, USB power cable, power adaptor and removable adhesive strip	Roku Ultra, Roku Voice Remote Pro (2nd edition), USB-C charging cable for the remote, Premium High Speed HDMI cable, power adaptor