#31AFFB
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.2% 0.153 241.1), rgb(49, 175, 251).
Aa
Black text reads best on this color (8.65:1).
About this color
#31AFFB is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.153 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.042 away. Black text reads best on it, at 8.65:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.65:1 |
| White text | 2.42:1 |
Values
| HEX | #31AFFB |
| RGB | rgb(49, 175, 251) |
| HSL | hsl(203, 96%, 59%) |
| OKLCH | oklch(72.2% 0.153 241.1) |
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 #31AFFB | 2.42:1 | Fails | Lc -52.3 | Large or bold text, headings |
| Black text on #31AFFB | 8.65:1 | AAA | Lc 56.7 | Large or bold text, headings |
| #31AFFB text on white | 2.42:1 | Fails | Lc 47.3 | Large or bold text, headings |
| #31AFFB text on black | 8.65:1 | AAA | Lc -54.7 | 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
#BBDEF9
oklch(88.4% 0.053 241.4)
-
Step 300
300
#87C9F9
oklch(80.9% 0.096 241)
-
Step 400
400 (this color)
#31AFFB
oklch(72.2% 0.153 241.1)
-
Step 500
500
#0092D9
oklch(63.1% 0.147 241)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#31AFFB 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) | #8BB0FE | 0.075 |
| Deuteranopia (no green cones) | #6F9EFA | 0.058 |
| Tritanopia (no blue cones) | #00C2CA | 0.102 |
| Achromatopsia (no color) | #A6A6A6 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31AFFB
#31AFFB
oklch(72.2% 0.153 241.1)
- #E88B2B
#E88B2B
oklch(72.1% 0.152 60.9)
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 #31AFFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.042
- Chefchaouen Blue #4895EF ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.071
- Bright Sky Blue #02CCFE ΔE 0.078
- Carolina Blue #8AB8FE ΔE 0.079
- Vivid Sky Blue #4CC9F0 ΔE 0.081
- Dodger Blue #1E90FF ΔE 0.087
- Turquoise Blue #06B1C4 ΔE 0.087
Use #31AFFB 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.