#128FEC
Closest named color: Dark Sky Blue (#448EE4). oklch(63.6% 0.17 248.9), rgb(18, 143, 236).
Aa
Black text reads best on this color (6.16:1).
About this color
#128FEC is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.170 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.026 away. Black text reads best on it, at 6.16:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.16:1 |
| White text | 3.40:1 |
Values
| HEX | #128FEC |
| RGB | rgb(18, 143, 236) |
| HSL | hsl(206, 86%, 50%) |
| OKLCH | oklch(63.6% 0.17 248.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #128FEC | 3.40:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #128FEC | 6.16:1 | AA | Lc 43.2 | Non-text elements, placeholder text |
| #128FEC text on white | 3.40:1 | AA large text | Lc 60.9 | Content text, not long reading |
| #128FEC text on black | 6.16:1 | AA | Lc -40.8 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFA
oklch(93.7% 0.024 248.1)
-
Step 200
200
#C2DCF7
oklch(88.4% 0.047 249.4)
-
Step 300
300
#97C6F4
oklch(81% 0.082 248.3)
-
Step 400
400
#58A6EF
oklch(70.7% 0.132 248.8)
-
Step 500
500 (this color)
#128FEC
oklch(63.6% 0.17 248.9)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004375
oklch(37.5% 0.104 249)
-
Step 950
950
#032847
oklch(27.1% 0.07 248.8)
#128FEC with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6095F0 | 0.055 |
| Deuteranopia (no green cones) | #3D83EA | 0.033 |
| Tritanopia (no blue cones) | #00A6B2 | 0.123 |
| Achromatopsia (no color) | #8B8B8B | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128FEC
#128FEC
oklch(63.6% 0.17 248.9)
- #C07900
#C07900
oklch(63.6% 0.139 69.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #128FEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.035
- Water Blue #0E87CC ΔE 0.051
- Soft Blue #6488EA ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.058
- Clear Blue #247AFD ΔE 0.062
- Cool Blue #4984B8 ΔE 0.080
Use #128FEC in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.