Nuphy Air75 V3 vs MelGeek O2
Get the Nuphy Air75 V3 for hot-swappable switches, QMK and ISO layout options, and choose the MelGeek O2 for its vendor-described ability to switch between up to eight devices and its included internal foam layers.
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4.9 (258)4.9 · 258 reviews
from$135at Input Gear
No reviews
from$109at MelGeek
90-day lowLowest price in 90 days
Which one should you get?
Get the
Nuphy Air75 V3
Hot-swappable
Build quality in the top 15% of 75% boards under $150.
- Hot-swappable switches, QMK and VIA support, and DIY kit/barebones options.
- ANSI, ISO and JIS layout choices, with a 75% layout and F-row.
- A knob module that rotates and presses, plus multi-media keys.
- Low-profile switches and keycaps only. Standard MX keycaps will not fit.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
- No numpad.
Get the
MelGeek O2
Build quality in the top 50% of Numpad boards under $150.
- Vendor-described switching between up to eight devices.
- Internal damping includes a Poron switch pad, IXPE foam and bottom Poron damping foam.
- MIA custom-height PBT dye-sublimated keycaps.
- Switches are soldered. Swapping them means soldering.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
- No ISO layout. ISO-DE, UK, and other ISO variants are not offered.
- Numpad only. This is not a full keyboard.
Get the Nuphy Air75 V3 if you want hot-swappable switches, QMK and VIA support, ISO or JIS layout choices, and a knob with media controls. Choose the MelGeek O2 if switching between up to eight devices and its specified Poron and IXPE damping layers matter more to you. Check the O2’s listed layout classification and the Air75 V3’s low-profile keycap requirements before buying.
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.
Nuphy Air75 V3
MelGeek O2
Layout size
75%
Numpad
Hot-swappable
Yes
No
Switch changes without soldering
Battery
4,000 mAh
2,500 mAh
A larger battery means fewer cables during the day
Low profile
Yes
No
Case material
ABS, Aluminum, Plastic
ABS, Aluminum, Polycarbonate
- Nuphy Air75 V3
- MelGeek O2
- Performance
- 7954
- Build quality
- 8265
- Productivity
- 8853
- Customizability
- 9050
- Portability
- 8182
- Connection: Bluetooth, 2.4 GHz, Wired
- Max polling rate: 1,000 Hz
- Mount style: Gasket Mount
- Sound dampening
- Plate material: Polycarbonate
What will you mostly use it for?
The Air75 V3 takes the listed categories through its broader switch and firmware customization, rollover support, and productivity controls. It is also the more travel-oriented layout here, though the O2 weighs less. The O2’s clearest case is for shoppers who value its vendor-described switching between up to eight devices or its specified internal damping layers, rather than the category advantages above.
Pick the Nuphy Air75 V3
- The Air75 V3 lists N-key rollover support; the O2 vendor description lists key rollover as N/A.
- The Air75 V3 offers switch choices described as tactile, linear and clicky, plus hot-swap support.
Nuphy Air75 V3 vs MelGeek O2 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
16 of 26 specs differ
Nuphy Air75 V3
MelGeek O2
Switch options
Hot-swappable
Mount style
Low profile
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Typing angle
Backlight
QMK
N-key rollover
Mac & Windows
Released
Compare prices
Live prices from the stores we track, cheapest in-stock offer first.
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Lowest price across stores, Amazon excluded.
ISO layouts by store
Which stores sell ISO-DE, UK, and the other regional layouts.
Nuphy Air75 V3
- Go to Input Gear
Input Gear
ISO-DE, ISO-FR
In stockShips to you
- Go to Nuphy
Nuphy
ISO-DE, ISO-UK, ISO-FR
In stockDoes not ship to you
MelGeek O2
No ISO layout at the stores we track.
Nuphy Air75 V3 vs MelGeek O2: your questions
The Nuphy Air75 V3 is listed as hot-swappable. The MelGeek O2 has soldered switches, so replacing them requires soldering.
Yes, QMK support is listed for the Air75 V3, along with VIA support. The MelGeek O2’s listed extra features do not include either.
Yes, the Air75 V3 is listed with ISO options, including German, French and UK layouts, as well as ANSI and JIS. The MelGeek O2 is listed as ANSI, and its compatibility notes say ISO variants are not offered.
MelGeek describes the O2 as able to connect to up to eight devices. Its listed connection modes are 2.4 GHz wireless, Bluetooth and wired.
The product listing classifies the MelGeek O2 as Numpad, while the Air75 V3 is a 75% layout and its compatibility notes say it has no numpad. Check the O2’s exact layout before ordering, since its vendor description also calls it an 83-key compact layout.
No. The Air75 V3 compatibility notes specify low-profile switches and keycaps only, and say standard MX keycaps will not fit.
The O2 switches are soldered, so changing them requires soldering. The vendor describes support for Kailh low-profile mechanical switches only.
The Air75 V3 is listed with a 4000 mAh battery, while the MelGeek O2 is listed with a 2500 mAh battery. Battery capacity alone does not establish runtime under the same usage conditions.
Both product listings specify RGB lighting. The O2 vendor description also names dual ambient side lights, while the Air75 V3 is listed with RGB and north-facing and south-facing LED entries.
The Air75 V3 listing includes knob support, and NuPhy describes a knob module that rotates and presses. No knob is listed among the MelGeek O2’s features.
MelGeek lists an aluminum alloy, PC and ABS construction, a PC plate, a Poron switch pad, IXPE foam and bottom Poron damping foam. Its keycaps are MIA custom-height PBT dye-sublimated keycaps.
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