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Compare Keychron B3 Pro vs K3 Differences Side by Side

This comparison is for users deciding between two of Keychron's popular low-profile, 75% wireless keyboards. The choice is difficult because both share a compact form factor, multi-device connectivity, and Mac/Windows support. The decision hinges on whether you prioritize a lower-cost model with a dedicated 2.4GHz receiver or a more premium model with switch customization and a sturdier build.

Keychron B3 Pro Ultra-Slim Wireless Keyboard
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Keychron K3 Ultra-slim Wireless Mechanical Keyboard FR-ISO Layout

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  • Released in 2025
  • Has Linear, Tactile, Clicky switch options
  • Built with the ANSI layout standard
  • Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity
  • Runs at a 1000 Hz polling rate
  • Equipped with a 1200 mAh battery
  • Weighs about 410 g
  • Sized at 3 x 100 x 380 mm
  • Made with a ABS case
  • Features ABS keycaps
  • Offers No RGB lighting
  • Released in 2023
  • Has Tactile, Linear, Clicky switch options
  • Supports hot-swappable switches
  • Built with the ISO-FR, ISO, ANSI layout standard
  • Uses a Plate Mount mounting style
  • Supports Bluetooth, Wired, Wireless connectivity
  • Equipped with a 1550 mAh battery
  • Made with a Aluminum, ABS case
  • Features PBT, ABS keycaps
  • Offers Yes, Rgb, White, North-face, Rgb North-face RGB lighting
Scores
  • Performance: 48.5
  • Build Quality: 42.4
  • Productivity: 67.1
  • Customizability: 46
  • Portability: 78.3
Scores
  • Performance: 62.7
  • Build Quality: 61.7
  • Productivity: 66.8
  • Customizability: 69.6
  • Portability: 78.2
Name
Keychron B3 Pro
Name
Keychron K3
Release year
2025
Release year
2023
Switch Options
Linear, Tactile, Clicky
Switch Options
Tactile, Linear, Clicky
Profile
Low Profile
Profile
Low Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
75%
Layout Size
75%
Layout Standard
ANSI
Layout Standard
ISO-FR, ISO, ANSI
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, 2.4 GHz, Wired, Wireless
Connection
Bluetooth, Wired, Wireless
Polling Rate
1000 Hz
Polling Rate
-
Battery capacity
1200 mAh
Battery capacity
1550 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
-
Mount Style
Plate Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Backlight
 
Rgb, White, North-face
Case Colors
Case Colors
Case Material
ABS
Case Material
Aluminum, ABS
Keycaps Material
ABS
Keycaps Material
PBT, ABS
Dimensions
3 x 100 x 380 mm
Dimensions
-
Weight
410g
Weight
-
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Pros and Trade-offs

Your budget and need for a specific wireless technology are the deciding factors. The Keychron B3 Pro is the practical choice if you want reliable 2.4GHz wireless for gaming or a clutter-free setup without spending more. Opt for the Keychron K3 if you are willing to invest more for the ability to hot-swap switches, prefer RGB lighting, and value the sturdier feel of an aluminum frame.

Keychron B3 Pro

  • +Includes a 2.4 GHz wireless connection with a 1000 Hz polling rate for responsive gaming.
  • +Lower starting price point compared to the K3.
  • +Comes with a protective silicone skin, according to the vendor, for spill and dust protection.
  • +Features a dedicated storage slot for its 2.4GHz receiver.
  • +Programmable via the web-based Keychron Launcher without software installation.
  • −Case is made entirely of ABS plastic, lacking the aluminum frame of the K3.
  • −No RGB backlighting is available.
  • −Battery capacity is listed as 1200mAh, which is smaller than the K3's 1550mAh.
  • −Not advertised as hot-swappable, limiting physical switch customization.

Keychron K3

  • +Hot-swappable design for low-profile optical switches allows for easy customization.
  • +Case combines aluminum and ABS for a more premium build.
  • +Features RGB backlighting with multiple effects.
  • +Comes with 17 extra keycaps, a keycap puller, and a switch puller.
  • +Larger 1550mAh battery capacity for longer wireless use.
  • −Lacks a 2.4 GHz wireless connection, relying solely on Bluetooth and wired modes.
  • −Higher price range than the B3 Pro.
  • −Hot-swap compatibility is limited to Keychron's low-profile optical switches only.
  • −Vendor description does not mention a specific polling rate for its Bluetooth connection.

Which Keyboard Is Better for Your Needs?

The B3 Pro wins for gaming and travel due to its 2.4GHz wireless and lighter build. The K3 is the clear choice for modding and has advantages for programming and content creation with its hot-swap feature, RGB lighting, and included accessories. For general office use, both keyboards are equally capable with their shared wireless features and platform compatibility.

GamingKeychron B3 Pro
  • •The B3 Pro includes a 2.4 GHz wireless connection with a stated 1000 Hz polling rate for lower latency.
  • •Its vendor description highlights a plug-and-play Type-A receiver for a reliable wireless experience.
  • •The K3 lacks a specified 2.4GHz connection and polling rate for gaming.
OfficeTie
  • •Both keyboards offer Bluetooth and wired connectivity for multi-device use.
  • •Both include Mac and Windows support with multimedia keys.
  • •Both are low-profile and ultra-slim, as described by their vendors, suitable for a clean desk setup.
ProgrammingKeychron K3
  • •The K3 offers a 6° typing angle compared to the B3 Pro's 3°, which may provide a more comfortable typing posture.
  • •Its vendor description mentions it comes with 17 extra keycaps for layout customization.
  • •The K3's hot-swappable design allows programmers to choose their preferred switch type without soldering.
TravelKeychron B3 Pro
  • •The B3 Pro is lighter at 410g, while the K3's weight is not specified, potentially making the B3 Pro more portable.
  • •The B3 Pro's vendor description mentions a protective silicone skin is available to guard against spills and dust during travel.
  • •Both share a compact 75% layout and low-profile design.
ModdingKeychron K3
  • •The K3 is explicitly listed as hot-swappable for its low-profile optical switches, enabling easy switch changes.
  • •Its vendor description details a reinforced body structure and MX-styled stems for potential keycap compatibility.
  • •The B3 Pro's vendor description does not mention hot-swap capability, focusing instead on web-based key remapping.
Content CreationKeychron K3
  • •The K3 features RGB backlighting with 18 types, which can be useful for low-light editing environments.
  • •Its aluminum case construction, per the metadata, suggests a more premium feel and durability.
  • •The K3 includes a keycap puller and switch puller in the box, as stated in its vendor description, for easy maintenance.

Frequently Asked Questions (FAQ)

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