AULA F99 vs Keychron K4 ProGasket Mount vs Firmware Customization
Choose the AULA F99 for a softer typing feel and longer battery life, or the Keychron K4 Pro for deep firmware customization and layout flexibility.
Which one should you get?
Get the
AULA F99
Gasket Mount
- 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.
- 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.
Get the
Keychron K4 Pro
Firmware Customization
- 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.
- 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.
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.
The differences that matter
Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.
AULA F99
Keychron K4 Pro
Rapid trigger
Yes
No
Connection
Bluetooth, 2.4 GHz, Wired
Bluetooth, Wired
Battery
8,000 mAh
4,000 mAh
Case material
ABS, PBT, Plastic
ABS, Plastic
Switch options
Linear
Clicky, Linear, Tactile
- AULA F99
- Keychron K4 Pro
- Performance
- 5881
- Build quality
- 5784
- Productivity
- 8795
- Customizability
- 6596
- Portability
- 6254
- Layout size: 96%
- Hot-swappable
- Sound dampening
What will you mostly use it for?
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.
Pick the AULA 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.
What owners say
Ratings and quotes collected from verified store reviews, including the critical ones.
AULA F99
33 owner reviews
“I am really enjoying using AULA f99! UX is 10/10 The only negative thing is the battery indicator, I find it quite confusing therefore I turned it off alltogether.”
“Good product - poor service. The order wasnt filed and the stock ran out. Then for the replacement item to be filled it took way too long for the order to arrive and complete a customer build.”
Keychron K4 Pro
7 owner reviews
“I previously had a normal K4 and i love the new one, the only thing is that the stabilizers lube work is kinda bad and the space bar was very rattly but after some lube work the K4 pro retakes the perfect productivity keyboard.”
AULA F99 vs Keychron K4 Pro specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
17 of 27 specs differ
AULA F99
Keychron K4 Pro
Switch options
Rapid trigger
Hot-swappable
Mount style
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Typing angle
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
Compare prices
Live prices from the stores we track, cheapest in-stock offer first.
Lowest price across stores, Amazon excluded.
Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.
AULA F99 vs Keychron K4 Pro: your questions
The AULA F99 has a larger 8000mAh battery, while the Keychron K4 Pro has a 4000mAh battery. Based on the listed capacities, the F99 should offer significantly longer wireless operation between charges.
The Keychron K4 Pro has a 1000 Hz polling rate in wired mode, which is standard for gaming. However, its vendor description does not list a 2.4 GHz wireless mode, which is often preferred for low-latency wireless gaming. The AULA F99 explicitly includes a 2.4 GHz connection and Rapid Trigger.
The Keychron K4 Pro is more customizable via software. It supports the open-source QMK and VIA firmware, allowing for deep key remapping and macro creation through a web app. The AULA F99 uses a proprietary driver software that, according to its listing, only supports the Windows operating system.
Yes, both the AULA F99 and the Keychron K4 Pro list Mac and Windows support. The Keychron K4 Pro's description specifically mentions it includes keycaps for both operating systems.
The AULA F99 uses a gasket mount, where the plate is suspended on rubber or silicone gaskets to dampen vibration and create a softer, more flexible typing feel. The Keychron K4 Pro uses a tray mount, where the plate is screwed directly into the case bottom, which typically results in a firmer, more consistent feel across the board.
Yes, both keyboards are hot-swappable. This means you can change the mechanical switches without any soldering. The Keychron K4 Pro is also available in a barebones kit without switches or keycaps pre-installed.
The AULA F99 is designed with sound in mind, featuring a gasket mount and five specific layers of sound-dampening materials like foam and PET film. The Keychron K4 Pro also has sound-absorbing foam and a silicone dampening pad, but its tray mount and steel plate will produce a different, typically firmer acoustic profile.
The provided specifications and vendor description for the Keychron K4 Pro list connectivity as Bluetooth and Wired. There is no mention of a 2.4 GHz wireless dongle or receiver, which the AULA F99 explicitly includes.
The AULA F99 uses Cherry profile keycaps. The Keychron K4 Pro uses Keychron's OSA profile keycaps, which the vendor describes as an OEM profile with a spherical-angle top.
The AULA F99 has north-facing RGB LEDs. The Keychron K4 Pro has south-facing RGB LEDs. South-facing LEDs prevent interference with the legends on Cherry-profile keycaps, a common issue with north-facing designs.
The Keychron K4 Pro offers far more layout options. It is available in ANSI and multiple ISO layouts including UK, German, French, Spanish, Nordic, and Swiss. The AULA F99 is listed as ANSI only.
For the AULA F99, the listing includes the keyboard, a 2.4G receiver, a switch puller, two spare switches, and a USB-C cable. The contents for the Keychron K4 Pro are not detailed in the provided information, but it typically includes a USB-C cable and a switch/keycap puller.
Not sold on either?
Still torn?
Answer a few quick questions and the keyboard finder ranks 2,000+ boards by how you will actually use yours.