#2391D4
Closest named color: Water Blue (#0E87CC). oklch(62.9% 0.137 241.9), rgb(35, 145, 212).
Aa
Black text reads best on this color (6.07:1).
About this color
#2391D4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.137 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.031 away. Black text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 6.07:1 |
| White text | 3.45:1 |
Values
| HEX | #2391D4 |
| RGB | rgb(35, 145, 212) |
| HSL | hsl(203, 72%, 48%) |
| OKLCH | oklch(62.9% 0.137 241.9) |
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 #2391D4 | 3.45:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #2391D4 | 6.07:1 | AA | Lc 42.4 | Non-text elements, placeholder text |
| #2391D4 text on white | 3.45:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #2391D4 text on black | 6.07:1 | AA | Lc -40.0 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDF0
oklch(88.5% 0.037 240.7)
-
Step 300
300
#9BC7E9
oklch(81% 0.067 241.8)
-
Step 400
400
#5FA9DE
oklch(70.8% 0.107 241.6)
-
Step 500
500 (this color)
#2391D4
oklch(62.9% 0.137 241.9)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#062940
oklch(27% 0.058 242.5)
#2391D4 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) | #7193D7 | 0.065 |
| Deuteranopia (no green cones) | #5983D3 | 0.050 |
| Tritanopia (no blue cones) | #00A2A9 | 0.093 |
| Achromatopsia (no color) | #8A8A8A | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2391D4
#2391D4
oklch(62.9% 0.137 241.9)
- #C37318
#C37318
oklch(63% 0.138 61.9)
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 #2391D4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.049
- Cool Blue #4984B8 ΔE 0.050
- Blue NCS #118AB2 ΔE 0.054
- Steel Blue #4682B4 ΔE 0.057
- Faded Blue #658CBB ΔE 0.058
- Off Blue #5684AE ΔE 0.065
Use #2391D4 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.