FE 21.3 Helios 88 vs Promotype Key Boy Advance 50
![[Pre-order] Key Boy Advance 50 Custom Keyboard Kit](https://cdn.shopify.com/s/files/1/0602/3639/8777/files/keyboy-advanced-1.webp?v=1782959570&width=3840&quality=75)
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.
FE 21.3 Helios 88
Promotype Key Boy Advance 50
Case material
Aluminum
Polycarbonate
Plate material
Aluminum, CarbonFiber, FR4, Polycarbonate, POM
Aluminum
Released
2025
2026
- FE 21.3 Helios 88
- Promotype Key Boy Advance 50
- Performance
- 4956
- Build quality
- 5646
- Productivity
- 5156
- Customizability
- 5058
- Portability
- 4544
- Hot-swappable
FE 21.3 Helios 88 vs Promotype Key Boy Advance 50 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
3 of 12 specs differ
FE 21.3 Helios 88
Promotype Key Boy Advance 50
Hot-swappable
Mount style
Layout standard
Ergonomics
Display
Connection
Case material
Plate material
Weight
Typing angle
Backlight
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.
Not sold on either?
![[Pre-order] Metanoia Custom Keyboard Kit](https://cdn.shopify.com/s/files/1/0602/3639/8777/files/Metanoia_AltaDolch_13.jpg?v=1779968556&width=3840&quality=75)
![[In-stock] Nooir CP01 60% Mechanical Keyboard Kit](https://cdn.shopify.com/s/files/1/0109/9182/9049/files/2_429b9ad1-8a8b-4c17-aed1-e0ed5eab2f7a.png?v=1730343415&width=3840&quality=75)
Still torn?
Answer a few quick questions and the keyboard finder ranks 2,000+ boards by how you will actually use yours.