#31A5EF
Closest named color: Chefchaouen Blue (#4895EF). oklch(69.3% 0.147 242.2), rgb(49, 165, 239).
Aa
Black text reads best on this color (7.75:1).
About this color
#31A5EF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.147 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.043 away. Black text reads best on it, at 7.75:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.75:1 |
| White text | 2.70:1 |
Values
| HEX | #31A5EF |
| RGB | rgb(49, 165, 239) |
| HSL | hsl(203, 86%, 56%) |
| OKLCH | oklch(69.3% 0.147 242.2) |
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 #31A5EF | 2.70:1 | Fails | Lc -57.2 | Large or bold text, headings |
| Black text on #31A5EF | 7.75:1 | AAA | Lc 52.0 | Large or bold text, headings |
| #31A5EF text on white | 2.70:1 | Fails | Lc 52.0 | Large or bold text, headings |
| #31A5EF text on black | 7.75:1 | AAA | Lc -49.8 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DBEDFB
oklch(93.7% 0.027 241.2)
-
Step 200
200
#BCDEF9
oklch(88.5% 0.052 242.2)
-
Step 300
300
#8BC8F7
oklch(80.9% 0.092 242.4)
-
Step 400
400 (this color)
#31A5EF
oklch(69.3% 0.147 242.2)
-
Step 500
500
#0091DC
oklch(63% 0.151 242.6)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679D
oklch(49.2% 0.117 242)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#31A5EF 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) | #82A7F2 | 0.069 |
| Deuteranopia (no green cones) | #6895EE | 0.054 |
| Tritanopia (no blue cones) | #00B7BF | 0.100 |
| Achromatopsia (no color) | #9D9D9D | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31A5EF
#31A5EF
oklch(69.3% 0.147 242.2)
- #DB8424
#DB8424
oklch(69.2% 0.147 62.2)
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 #31A5EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.067
- Deep Sky Blue #00BFFF ΔE 0.069
- Soft Blue #6488EA ΔE 0.079
- Turquoise Blue #06B1C4 ΔE 0.082
- Periwinkle Blue #8F99FB ΔE 0.092
Use #31A5EF 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.