#31A3DF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68% 0.132 237), rgb(49, 163, 223).
Aa
Black text reads best on this color (7.43:1).
About this color
#31A3DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.132 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.051 away. Black text reads best on it, at 7.43:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.43:1 |
| White text | 2.82:1 |
Values
| HEX | #31A3DF |
| RGB | rgb(49, 163, 223) |
| HSL | hsl(201, 73%, 53%) |
| OKLCH | oklch(68% 0.132 237) |
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 #31A3DF | 2.82:1 | Fails | Lc -59.1 | Large or bold text, headings |
| Black text on #31A3DF | 7.43:1 | AAA | Lc 50.2 | Large or bold text, headings |
| #31A3DF text on white | 2.82:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #31A3DF text on black | 7.43:1 | AAA | Lc -48.0 | 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
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DCEDF8
oklch(93.7% 0.023 236)
-
Step 200
200
#BEDEF4
oklch(88.4% 0.046 238.1)
-
Step 300
300
#8DC9F0
oklch(80.9% 0.083 237.6)
-
Step 400
400 (this color)
#31A3DF
oklch(68% 0.132 237)
-
Step 500
500
#0094D2
oklch(63.2% 0.138 237.1)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#31A3DF 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) | #86A3E2 | 0.075 |
| Deuteranopia (no green cones) | #6F93DE | 0.061 |
| Tritanopia (no blue cones) | #00B2B8 | 0.084 |
| Achromatopsia (no color) | #9A9A9A | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31A3DF
#31A3DF
oklch(68% 0.132 237)
- #D4813C
#D4813C
oklch(67.9% 0.132 57.4)
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 #31A3DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.065
- Faded Blue #658CBB ΔE 0.076
- Dodger Blue #1E90FF ΔE 0.078
- Greyblue #77A1B5 ΔE 0.079
- Deep Sky Blue #00BFFF ΔE 0.080
Use #31A3DF 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.