#31A3EF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.8% 0.149 243.3), rgb(49, 163, 239).
Aa
Black text reads best on this color (7.61:1).
About this color
#31A3EF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.149 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.038 away. Black text reads best on it, at 7.61:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.61:1 |
| White text | 2.75:1 |
Values
| HEX | #31A3EF |
| RGB | rgb(49, 163, 239) |
| HSL | hsl(204, 86%, 56%) |
| OKLCH | oklch(68.8% 0.149 243.3) |
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 #31A3EF | 2.75:1 | Fails | Lc -58.0 | Large or bold text, headings |
| Black text on #31A3EF | 7.61:1 | AAA | Lc 51.2 | Large or bold text, headings |
| #31A3EF text on white | 2.75:1 | Fails | Lc 52.8 | Large or bold text, headings |
| #31A3EF text on black | 7.61:1 | AAA | Lc -49.1 | 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
#DBECFB
oklch(93.5% 0.027 244.7)
-
Step 200
200
#BDDEF9
oklch(88.5% 0.051 243)
-
Step 300
300
#8BC8F8
oklch(80.9% 0.093 243)
-
Step 400
400 (this color)
#31A3EF
oklch(68.8% 0.149 243.3)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#31A3EF 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) | #7FA5F2 | 0.067 |
| Deuteranopia (no green cones) | #6594EE | 0.051 |
| Tritanopia (no blue cones) | #00B6BE | 0.104 |
| Achromatopsia (no color) | #9C9C9C | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31A3EF
#31A3EF
oklch(68.8% 0.149 243.3)
- #DA831B
#DA831B
oklch(68.8% 0.149 63.1)
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 #31A3EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.062
- Deep Sky Blue #00BFFF ΔE 0.074
- Soft Blue #6488EA ΔE 0.075
- Turquoise Blue #06B1C4 ΔE 0.086
- Faded Blue #658CBB ΔE 0.090
Use #31A3EF 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.