Roku Express (3700) vs Roku Express 4K (3940)

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Express (3700) compared with Express 4K (3940)

	RokuExpress (3700)	RokuExpress 4K (3940)
Overview
Released
Released	October 2016	May 2021
Video and audio
Resolution
Resolution	1080p	4K (better)
HDR
HDR	None	HDR10, HDR10+ and HLG (better)
Video
Video	1920 × 1080 playback; 1280 × 720 interface rendering (Roku's exact Littlefield/3700X developer row)	Up to 4K at 60 fps (Roku's exact Marlin/3940X developer row); HDCP 2.2 required for 4K/HDR
HDR
HDR	–	HDR10, HDR10+ and HLG (Roku's exact Marlin/3940X developer row); no Dolby Vision
Performance
Software
Software	Roku OS	Roku OS
Chip details
Chip details	MIPS processor at 900 MHz (Roku's exact Littlefield/3700X developer row)	Arm Cortex-A55; OpenGL ES 2.0 (Roku's exact Marlin/3940X developer row)
Memory
Memory	512 MB (Roku's exact Littlefield/3700X developer row)	1 GB (Roku's exact Marlin/3940X developer row)
Storage
Storage	No verified built-in user storage capacity published in the maker sources read	Internal storage serves system/channel use; maker sources used do not publish user-accessible capacity
Software and services
Software and services	Roku OS; app availability varies by region and software version	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 4	Wi-Fi 5
Ethernet
Ethernet	No	No
Voice remote
Voice remote	No	No
Ports
Ports	HDMI output and Micro-USB power input; no Ethernet (Tom's Guide and Ars Technica)	HDMI output, micro-USB power/compatible Ethernet adaptor connection and reset. No built-in Ethernet socket; USB Ethernet adaptor sold separately
Wi-Fi and Bluetooth
Wi-Fi and Bluetooth	802.11b/g/n, single-band 2.4 GHz (Roku launch release and Ars Technica)	Dual-band 802.11ac Wi-Fi (Tech Advisor)
Remote
Remote	Original infrared remote with navigation, playback and fixed app buttons; no microphone or TV power/volume controls. Mobile-app voice search is separate from the supplied 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
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
In the box
In the box	–	Player, infrared remote, batteries, premium high-speed HDMI cable, USB power cable, power adaptor and removable adhesive strip
Size
Size	Small external box supplied with adhesive mounting strip and HDMI cable; infrared receiver must remain visible	–