Head to head · Prices checked Nov 1, 2026

Ktechs Rainy75 vs Redragon SPHINX K503

Get the Redragon SPHINX K503 for n-key rollover.

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Ktechs Rainy75

from$7at ktechs

Compare 2 stores

N-key rollover

Redragon SPHINX K503

from$30at Redragon

Compare 2 stores

Quick verdict

Which one should you get?

Get the

Ktechs Rainy75

Build quality in the bottom 30% of 75% boards under $50.

Rules this board out

Switches are soldered. Swapping them means soldering.
No ISO layout. ISO-DE, UK, and other ISO variants are not offered.
No numpad.

$7 at ktechs

Get the

Redragon SPHINX K503

N-key rollover

Build quality in the bottom 5% of 100% boards under $100.

Rules this board out

Switches are soldered. Swapping them means soldering.

$30 at Redragon

What actually differs

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.

Ktechs Rainy75

Redragon SPHINX K503

Layout size
75%
100%
Connection
Wireless
Wired
Wireless for several devices and wired for lower latency
Display
LED
None
A case display rather than a typing feature
Backlight
None
RGB
RGB for looks and low light rather than speed
N-key rollover
No
Yes

KeebFinder scores

How we score

Ktechs Rainy75
Redragon SPHINX K503

Performance: 47
76
Build quality: 65
43
Productivity: 46
50
Customizability: 42
48
Portability: 74
41

See every spec side by side

Full specs

Ktechs Rainy75 vs Redragon SPHINX K503 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

6 of 14 specs differ

Spec

Ktechs Rainy75

Redragon SPHINX K503

Typing & switches

Mount style

Gasket Mount

—

Layout

Layout size

75%

100%

Layout standard

—

ISO, ISO-FR

Ergonomics

Standard

Display

LED

None

Connectivity & battery

Connection

Wireless

Wired

Max polling rate

1,000 Hz

—

Battery

3,500 mAh

Wired only

Build & materials

Plate material

FR4, Plastic, Polycarbonate

—

Weight

—

1,000 g

Dimensions

—

440 x 180 x 40 mm

Backlight

None

RGB

Firmware & software

N-key rollover

Yes

Extras

Released

2024

2025

For EU buyers

ISO layouts by store

Which stores sell ISO-DE, UK, and the other regional layouts.

Ktechs Rainy75

No ISO layout at the stores we track.

Redragon SPHINX K503

Listed on the product, not split by store: ISO-FR.

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

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Ktechs Rainy752 stores