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Compare AULA F99 Pro vs Keychron K4 Max Differences Side by Side

This comparison is for buyers deciding between two popular 96% wireless mechanical keyboards. The choice is difficult because both offer hot-swappable switches, tri-mode connectivity, and a compact layout with a numpad. The AULA F99 Pro emphasizes a gasket-mounted, foam-filled acoustic design, while the Keychron K4 Max focuses on open-source programmability and a sturdier build. Your priority in typing feel versus software control will determine the winner.

71
EPOMAKER x AULA F99 PRO
87
Keychron K4 Max QMK Wireless Mechanical Keyboard ISO Layout Collection

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4.7 (39)
5.0 (1)
  • Released in 2024
  • Has Linear switch options
  • Built with the ANSI layout standard
  • Comes with a knob
  • Connects via USB-C
  • Uses a Gasket Mount mounting style
  • Equipped with a 8000 mAh battery
  • Weighs about 1023 g
  • Sized at 43 x 146 x 390 mm
  • Offers Yes, Rgb, South-face, Rgb South-face RGB lighting
  • Released in 2025
  • Has Linear, Tactile, Clicky switch options
  • Built with the ISO, ANSI layout standard
  • Provides dedicated media keys
  • Supports QMK firmware
  • Supports VIA configuration
  • Features N-key rollover
  • Includes screw-in stabilizers
  • Uses a PCB Mount mounting style
  • Runs at a 1000 Hz polling rate
  • Equipped with a 4000 mAh battery
  • Weighs about 1290 g
  • Sized at 31 x 391 x 140 mm
  • Features PBT keycaps
  • Offers Yes, Rgb, South-face, Rgb South-face, White, White South-face RGB lighting
Scores
  • Performance: 66.2
  • Build Quality: 63.9
  • Productivity: 84.1
  • Customizability: 68.2
  • Portability: 63.5
Scores
  • Performance: 82
  • Build Quality: 80.3
  • Productivity: 89.4
  • Customizability: 93
  • Portability: 50.8
Name
AULA F99 Pro
Name
Keychron K4 Max
Release year
2024
Release year
2025
Switch Options
Linear
Switch Options
Linear, Tactile, Clicky
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
96%
Layout Size
96%
Layout Standard
ANSI
Layout Standard
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, 2.4 GHz, Wired, Wireless
Polling Rate
-
Polling Rate
1000 Hz
Battery capacity
8000 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
Gasket Mount
Mount Style
PCB Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, South-face
Backlight
 
Rgb, South-face, White, White South-face
Case Colors
Case Colors
Case Material
ABS
Case Material
ABS
Keycaps Material
-
Keycaps Material
PBT
Dimensions
43 x 146 x 390 mm
Dimensions
31 x 391 x 140 mm
Weight
1023g
Weight
1290g
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Pros and Trade-offs

Your decision rests on the core trade-off between acoustic tuning and software freedom. The AULA F99 Pro is the better out-of-the-box experience for those who want a softer, quieter typing feel and longer battery life without needing to mod. The Keychron K4 Max is the superior choice for enthusiasts who value programmability above all, offering QMK/VIA support, a sturdier build with a steel plate, and more switch variety. Prioritize typing feel and battery for the F99 Pro; prioritize customization and a precise, rigid response for the K4 Max.

AULA F99 Pro

  • +Gasket mount structure with a PC plate for a softer, more flexible typing feel.
  • +Larger 8000mAh battery capacity for extended wireless use.
  • +Includes five layers of sound-dampening materials like sandwich foam, IXPE switch pad, and PET film.
  • +Lighter weight (1023g) enhances portability.
  • +Comes with a dedicated software driver (AULA Driver) for RGB and key mapping customization.
  • −Only available with linear switch options.
  • −Uses a plastic plate, which may feel less rigid than metal alternatives.
  • −Customization software is proprietary, not open-source like QMK/VIA.

Keychron K4 Max

  • +Full support for QMK and VIA open-source firmware for limitless key remapping.
  • +Built with a steel plate and screw-in stabilizers for a solid, stable feel.
  • +Includes double-shot PBT keycaps in an OSA profile for better durability.
  • +Offers a choice of linear, tactile, and clicky switch types from Keychron.
  • +Explicitly lists a 1000 Hz polling rate for low-latency gaming.
  • −Heavier at 1290g, making it less portable.
  • −Smaller 4000mAh battery compared to the F99 Pro.
  • −Uses a PCB mount style, which typically offers less flex than a gasket mount.

Which Keyboard Is Better for Your Needs?

The Keychron K4 Max wins for gaming due to its specified polling rate, and is the clear choice for programming and modding thanks to QMK/VIA support. The AULA F99 Pro is better for travel because of its lower weight and larger battery. For office use and content creation, the decision is a tie, hinging on whether you prioritize battery life and acoustics or keycap durability and software customization.

GamingKeychron K4 Max
  • •The Keychron K4 Max lists a 1000 Hz polling rate for its 2.4 GHz and wired modes.
  • •Its vendor page claims the polling rate makes latency 'hardly noticeable even in competitive games'.
  • •The steel plate may provide a more immediate, consistent keypress feedback compared to the F99 Pro's PC plate.
OfficeTie
  • •Both have a 96% layout with a numpad and tri-mode wireless connectivity for device switching.
  • •Both include Mac and Windows support with appropriate keycaps.
  • •The K4 Max's PBT keycaps may resist shine longer, while the F99 Pro's larger 8000mAh battery offers longer use between charges.
ProgrammingKeychron K4 Max
  • •The Keychron K4 Max supports QMK and VIA firmware for extensive key remapping and macro programming.
  • •Its vendor description highlights configurable layers and shortcuts via the Keychron Launcher web app.
  • •The inclusion of screw-in stabilizers, as listed in its specs, may contribute to a more stable typing feel on large keys.
TravelAULA F99 Pro
  • •The AULA F99 Pro is notably lighter at 1023g compared to the Keychron K4 Max's 1290g.
  • •It has a larger 8000mAh battery, which its vendor claims provides 'sustained performance'.
  • •Its slightly smaller depth (146mm vs the K4 Max's 140mm width, noting different dimension orientations) and lower weight make it more portable.
ModdingKeychron K4 Max
  • •The Keychron K4 Max explicitly supports QMK and VIA, allowing for deep firmware-level customization.
  • •It features a steel plate and screw-in stabilizers, which are preferred modding platforms.
  • •It offers a choice of linear, tactile, and clicky switch types from the factory, providing more initial variety.
Content CreationTie
  • •Both keyboards feature a rotary knob for media control, a useful tool for editing workflows.
  • •Both offer full N-key rollover (explicitly listed for the K4 Max, implied by gaming focus for the F99 Pro) for complex shortcut inputs.
  • •The choice depends on preference: the F99 Pro's gasket mount for a quieter, softer typing sound, or the K4 Max's programmability for workflow-specific macros.

Frequently Asked Questions (FAQ)

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