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Compare AULA F99 vs Keychron K4 Pro 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, wireless connectivity, and sound dampening, but they diverge in core philosophy. The AULA F99 emphasizes a premium acoustic and tactile experience with its gasket mount and multi-layered foam, while the Keychron K4 Pro prioritizes user control with open-source QMK/VIA firmware and a wide array of international layouts.

75
EPOMAKER x AULA F99
92
Keychron K4 Pro QMK/VIA Wireless Mechanical Keyboard

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4.8 (51)
4.7 (7)
  • Released in 2023
  • Has Linear switch options
  • Built with the ANSI layout standard
  • Enables rapid trigger functionality
  • Uses a Gasket Mount mounting style
  • Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity
  • Equipped with a 8000 mAh battery
  • Weighs about 1023 g
  • Sized at 43 x 147 x 391 mm
  • Made with a ABS, Plastic, PBT case
  • Features PBT keycaps
  • Offers Yes, Rgb, North-face, Rgb North-face RGB lighting
  • Released in 2022
  • Has Linear, Tactile, Clicky switch options
  • Built with the ANSI, ISO, ISO-DE, ISO-ES, ISO-FR, ISO-Nordic, ISO-SW, ISO-UK layout standard
  • Provides dedicated media keys
  • Supports QMK firmware
  • Supports VIA configuration
  • Features N-key rollover
  • Uses a Tray Mount mounting style
  • Supports Bluetooth, Wired, Wireless connectivity
  • Runs at a 1000 Hz polling rate
  • 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: 59.5
  • Build Quality: 63.1
  • Productivity: 89.1
  • Customizability: 72.9
  • Portability: 64.3
Scores
  • Performance: 81.3
  • Build Quality: 83.8
  • Productivity: 94.6
  • Customizability: 97.2
  • Portability: 53.6
Name
AULA F99
Name
Keychron K4 Pro
Release year
2023
Release year
2022
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
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, 2.4 GHz, Wired, Wireless
Connection
Bluetooth, 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
Tray Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, North-face
Backlight
 
Rgb, White, South-face, White South-face
Case Colors
Case Colors
Case Material
ABS, Plastic, PBT
Case Material
Plastic, ABS
Keycaps Material
PBT
Keycaps Material
PBT, ABS
Dimensions
43 x 147 x 391 mm
Dimensions
31 x 391 x 139 mm
Weight
1023g
Weight
1280g
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Pros and Trade-offs

Your priority should guide your choice. If you value a specific typing sound and feel with maximum wireless endurance, the AULA F99's gasket mount and large battery are compelling. If you need to reprogram your keyboard deeply, require a specific international layout, or want to build from a barebones kit, the Keychron K4 Pro's firmware and layout support are unmatched. Both are competent pre-built keyboards, but they serve different enthusiast goals.

AULA F99

  • +Gasket mount structure with polycarbonate or FR4 plate for a softer, more flexible typing feel.
  • +Includes a 2.4 GHz wireless connection alongside Bluetooth and wired USB-C.
  • +Large 8000mAh battery capacity for extended wireless use.
  • +Five layers of sound-dampening materials including sandwich foam, IXPE pad, PET film, bottom foam, and silicone pad.
  • +Features Rapid Trigger functionality for gaming.
  • −Only available in ANSI layout, lacking the ISO options of the K4 Pro.
  • −Software customization is limited to the proprietary AULA driver, which only supports Windows.
  • −Uses north-facing RGB LEDs, which can interfere with Cherry-profile keycaps.

Keychron K4 Pro

  • +Full support for QMK and VIA open-source firmware for extensive key remapping and macro programming.
  • +Available in a wide range of ISO layouts (UK, German, French, Spanish, Nordic, Swiss).
  • +Offers a barebones kit version for custom builders.
  • +South-facing RGB LEDs avoid interference with Cherry-profile keycaps.
  • +Includes pre-lubed Keychron K Pro switches in the assembled version.
  • −Smaller 4000mAh battery compared to the F99.
  • −Heavier at 1280 grams.
  • −Uses a tray mount instead of a gasket mount, which typically offers less flex.
  • −Vendor description does not mention a 2.4 GHz wireless connection, only Bluetooth and wired.

Which Keyboard Is Better for Your Needs?

The Keychron K4 Pro is the stronger choice for work and customization, winning in Office, Programming, and Modding due to its firmware and layout options. The AULA F99 takes the lead for Gaming and Travel, thanks to its 2.4GHz dongle, Rapid Trigger, larger battery, and lighter weight. For Content Creation, both keyboards are equally capable with their shared 96% layout and hot-swap sockets.

GamingAULA F99
  • •Includes a 2.4 GHz wireless connection for low-latency gaming, which the K4 Pro listing does not mention.
  • •Features Rapid Trigger functionality for faster actuation.
  • •Lighter weight (1023g vs 1280g) may be preferable for desk setup adjustments.
OfficeKeychron K4 Pro
  • •Offers extensive ISO layout support (UK, German, Nordic, etc.) for international users.
  • •Includes multimedia keys for quick control.
  • •Vendor description highlights seamless Bluetooth switching between up to three devices for multitasking.
ProgrammingKeychron K4 Pro
  • •Full QMK and VIA firmware support allows for deep key remapping and macro creation.
  • •Available in a barebones kit version for those who want to choose their own switches and keycaps from the start.
  • •South-facing RGB LEDs prevent interference with Cherry-profile keycaps, a common choice in custom builds.
TravelAULA F99
  • •Significantly larger 8000mAh battery promises longer wireless use between charges.
  • •Is notably lighter at 1023 grams compared to 1280 grams.
  • •Smaller physical footprint in one dimension (43mm height vs K4 Pro's 31mm, but 391mm length vs 139mm, suggesting a more compact overall profile).
ModdingKeychron K4 Pro
  • •QMK/VIA firmware allows for software-level customization beyond what the AULA driver offers.
  • •Barebone kit option is available for builders.
  • •Steel plate provides a different typing feel foundation compared to the F99's PC/FR4 plates.
Content CreationTie
  • •Both retain a numpad for numerical input, useful for editing software.
  • •Both feature RGB backlighting for low-light work environments.
  • •Both are hot-swappable, allowing users to tailor switch feel for long typing or editing sessions.

Frequently Asked Questions (FAQ)

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