#28B1FB
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.5% 0.153 239.2), rgb(40, 177, 251).
Aa
Black text reads best on this color (8.77:1).
About this color
#28B1FB is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.153 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.037 away. Black text reads best on it, at 8.77:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.77:1 |
| White text | 2.39:1 |
Values
| HEX | #28B1FB |
| RGB | rgb(40, 177, 251) |
| HSL | hsl(201, 96%, 57%) |
| OKLCH | oklch(72.5% 0.153 239.2) |
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 #28B1FB | 2.39:1 | Fails | Lc -51.6 | Large or bold text, headings |
| Black text on #28B1FB | 8.77:1 | AAA | Lc 57.3 | Large or bold text, headings |
| #28B1FB text on white | 2.39:1 | Fails | Lc 46.6 | Large or bold text, headings |
| #28B1FB text on black | 8.77:1 | AAA | Lc -55.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DAEDFB
oklch(93.6% 0.028 239.7)
-
Step 200
200
#BADFF9
oklch(88.6% 0.053 238.8)
-
Step 300
300
#85C9F8
oklch(80.8% 0.096 239.7)
-
Step 400
400 (this color)
#28B1FB
oklch(72.5% 0.153 239.2)
-
Step 500
500
#0093D6
oklch(63.1% 0.143 239.3)
-
Step 600
600
#007BB4
oklch(55.5% 0.126 239.3)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#00476A
oklch(37.9% 0.085 239)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#28B1FB 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) | #8DB2FE | 0.080 |
| Deuteranopia (no green cones) | #719FFA | 0.064 |
| Tritanopia (no blue cones) | #00C4CB | 0.101 |
| Achromatopsia (no color) | #A7A7A7 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28B1FB
#28B1FB
oklch(72.5% 0.153 239.2)
- #EB8B2F
#EB8B2F
oklch(72.5% 0.153 59.2)
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 #28B1FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.037
- Chefchaouen Blue #4895EF ΔE 0.073
- Bright Sky Blue #02CCFE ΔE 0.073
- Cornflower Blue #6495ED ΔE 0.076
- Vivid Sky Blue #4CC9F0 ΔE 0.077
- Carolina Blue #8AB8FE ΔE 0.080
- Turquoise Blue #06B1C4 ΔE 0.085
- Dodger Blue #1E90FF ΔE 0.091
Use #28B1FB 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.