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Compare Keychron K3 Pro vs K4 Pro Differences Side by Side

This comparison is for buyers deciding between Keychron's ultra-slim K3 Pro and the full featured K4 Pro. The decision is tough because both offer QMK/VIA support, Bluetooth, and hot-swappable switches, but they target different priorities. The K3 Pro is a 75% low-profile board built for portability and a slim typing angle, while the K4 Pro is a 96% board with a numpad, steel plate, and sound dampening. Your choice comes down to whether you value a compact travel-friendly design or a full layout with a numeric keypad.

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Keychron K3 Pro QMK/VIA Wireless Mechanical Keyboard ISO Layout Collection
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Keychron K4 Pro QMK/VIA Wireless Mechanical Keyboard - Image: 4

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4.7 (52)
4.7 (7)
  • Features a low-profile design
  • Available in a 75% layout
  • Built with the ISO, JIS, ISO-DE, ISO-ES, ISO-FR, ISO-Nordic, ISO-SW, ISO-UK, ANSI layout standard
  • Supports Bluetooth, Wired, Wireless, 2.4 GHz connectivity
  • Equipped with a 1550 mAh battery
  • Weighs about 930 g
  • Sized at 15 x 306 x 116 mm
  • Made with a Aluminum, Plastic, ABS case
  • Features ABS, PBT keycaps
  • Offers Yes, Rgb, South-face, Rgb South-face, White, North-face, Rgb North-face, White North-face RGB lighting
  • Available in a 96% layout
  • Built with the ANSI, ISO, ISO-DE, ISO-ES, ISO-FR, ISO-Nordic, ISO-SW, ISO-UK layout standard
  • Includes screw-in stabilizers
  • Has built-in sound dampening
  • Supports Bluetooth, Wired, Wireless connectivity
  • Equipped with a 4000 mAh battery
  • Weighs about 1280 g
  • Sized at 31 x 391 x 139 mm
  • Made with a Plastic, ABS case
  • Features PBT, ABS keycaps
  • Offers Yes, Rgb, White, South-face, Rgb South-face, White South-face RGB lighting
Scores
  • Performance: 80.9
  • Build Quality: 81.2
  • Productivity: 79.7
  • Customizability: 89
  • Portability: 77.2
Scores
  • Performance: 81.2
  • Build Quality: 83.8
  • Productivity: 94.6
  • Customizability: 97.3
  • Portability: 53.4
Name
Keychron K3 Pro
Name
Keychron K4 Pro
Release year
2022
Release year
2022
Switch Options
Linear, Tactile, Clicky
Switch Options
Linear, Tactile, Clicky
Profile
Low Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
75%
Layout Size
96%
Layout Standard
ISO, JIS, ISO-DE, ISO-ES, ISO-FR, ISO-Nordic, ISO-SW, ISO-UK, ANSI
Layout Standard
ANSI, ISO, ISO-DE, ISO-ES, ISO-FR, ISO-Nordic, ISO-SW, ISO-UK
Layout Ergonomics
Normal
Layout Ergonomics
Normal
Knob Support
 
Knob Support
 
Display Support
 
Display Support
 
Mac/Win Support
 
Mac/Win Support
 
Multi-Media Keys
 
Multi-Media Keys
 
USB-C
 
USB-C
 
USB passthrough
 
USB passthrough
 
Connection
Bluetooth, Wired, Wireless, 2.4 GHz
Connection
Bluetooth, Wired, Wireless
Polling Rate
1000 Hz
Polling Rate
1000 Hz
Battery capacity
1550 mAh
Battery capacity
4000 mAh
Hall Effect Support
 
Hall Effect Support
 
QMK Support
 
QMK Support
 
VIA Support
 
VIA Support
 
VIAL Support
 
VIAL Support
 
N-Key Rollover
 
N-Key Rollover
 
Rapid Trigger
 
Rapid Trigger
 
Mount Style
Tray Mount
Mount Style
Tray Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, South-face, White, North-face
Backlight
 
Rgb, White, South-face, White South-face
Case Colors
Case Colors
Case Material
Aluminum, Plastic, ABS
Case Material
Plastic, ABS
Keycaps Material
ABS, PBT
Keycaps Material
PBT, ABS
Dimensions
15 x 306 x 116 mm
Dimensions
31 x 391 x 139 mm
Weight
930g
Weight
1280g
*Something incorrect or missing? Please
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Pros and Trade-offs

If you prioritize a compact, lightweight keyboard for travel or gaming, the K3 Pro with its low profile and slim design is the better fit. If you need a numpad for office work or content creation and prefer a sturdier build with sound dampening, the K4 Pro is the clear choice. Both are excellent programmable keyboards with QMK/VIA support, so your decision should hinge on layout size and portability.

Keychron K3 Pro

  • +Ultra-slim low profile body with Gateron low-profile switches for a reduced typing height
  • +Compact 75% layout with a 930g weight, easy to carry for travel
  • +Three level adjustable typing angle for ergonomic wrist support
  • +Hot-swappable low-profile Gateron switches without soldering
  • +Available with both shine-through ABS and double-shot PBT keycap options
  • −Only compatible with Gateron low-profile mechanical switches, limiting switch choices
  • −Plastic plate material may feel less rigid compared to a steel plate
  • −Smaller 1550mAh battery requires more frequent charging than the K4 Pro
  • −7 customer reviews indicate a lower sample size for reliability feedback

Keychron K4 Pro

  • +Full 96% layout with a dedicated numpad for productivity tasks
  • +Steel plate and sound dampening foam with a silicone bottom pad for a quieter and more solid typing feel
  • +Screw-in PCB stabilizers reduce wobble on larger keys like space bar and enter
  • +Larger 4000mAh battery supports extended wireless use
  • +Accepts a wide range of 3pin and 5pin MX style switches for maximum customization
  • −Heavier at 1280g and larger footprint (391 x 139 mm), less portable
  • −Normal profile design lacks the slim ergonomics of the K3 Pro
  • −Some early reports of PCB defects on first-run units (e.g., numpad zero key issue)
  • −Double-shot PBT keycaps are non-shine-through, reducing RGB legibility

Which Keyboard Is Better for Your Needs?

For gaming and travel, the K3 Pro wins due to its lighter weight and compact low-profile design. The K4 Pro takes the lead for office and content creation thanks to its numpad, sound dampening, and larger battery. Programming is a tie as both offer the same QMK/VIA programmability and hot-swap capabilities. Modders will prefer the K4 Pro for its sturdier steel plate and pre-installed foam.

GamingKeychron K3 Pro
  • •1000 Hz polling rate on wired mode for low latency
  • •Lighter 930g weight makes it easier to transport to LAN events
  • •Low profile design may suit gamers who prefer a shallow key travel
OfficeKeychron K4 Pro
  • •96% layout with a dedicated numpad speeds up data entry
  • •Sound dampening with silicone bottom pad and steel plate for a quieter typing experience
  • •Larger 4000mAh battery reduces charging frequency
ProgrammingTie
  • •Both offer QMK and VIA support for full key remapping and macros
  • •Both provide hot-swappable switches for customizing feel
  • •K3 Pro has a more compact layout saving desk space; K4 Pro provides a numpad which some developers prefer
TravelKeychron K3 Pro
  • •Weighs 930g, significantly lighter than the 1280g K4 Pro
  • •Compact 75% dimensions (306 x 116 mm) fit easily in a bag
  • •Ultra-slim low profile design is 31% slimmer than normal profile switches
ModdingKeychron K4 Pro
  • •Steel plate and screw-in PCB stabilizers provide a sturdier modding foundation
  • •Sound dampening foam and silicone bottom pad included from the factory
  • •Accepts almost all 3pin and 5pin MX style switches, offering more variety
Content CreationKeychron K4 Pro
  • •Dedicated numpad is useful for entering numerical values in video timelines or budgets
  • •OSA profile double-shot PBT keycaps offer oil resistance for long editing sessions
  • •Larger battery supports longer wireless use without interruption

Frequently Asked Questions (FAQ)

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