#2371E4
Closest named color: Cerulean Blue (#056EEE). oklch(56.8% 0.19 258.9), rgb(35, 113, 228).
Aa
White text reads best on this color (4.61:1).
About this color
#2371E4 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.190 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.020 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.55:1 |
| White text | 4.61:1 |
Values
| HEX | #2371E4 |
| RGB | rgb(35, 113, 228) |
| HSL | hsl(216, 78%, 52%) |
| OKLCH | oklch(56.8% 0.19 258.9) |
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 #2371E4 | 4.61:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #2371E4 | 4.55:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #2371E4 text on white | 4.61:1 | AA | Lc 71.4 | Content text, not long reading |
| #2371E4 text on black | 4.55:1 | AA | Lc -30.3 | 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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DBF9
oklch(88.6% 0.047 258.4)
-
Step 300
300
#9FC2F8
oklch(80.8% 0.086 258.9)
-
Step 400
400
#6AA1F5
oklch(70.7% 0.137 258.6)
-
Step 500
500
#4186F1
oklch(63% 0.175 259)
-
Step 600
600 (this color)
#2371E4
oklch(56.8% 0.19 258.9)
-
Step 700
700
#105AC2
oklch(49% 0.177 258.9)
-
Step 800
800
#124A9D
oklch(42.6% 0.147 259.1)
-
Step 900
900
#173F7D
oklch(37.7% 0.115 259.2)
-
Step 950
950
#0E2649
oklch(27.1% 0.072 258)
#2371E4 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) | #247EE8 | 0.034 |
| Deuteranopia (no green cones) | #006DE2 | 0.017 |
| Tritanopia (no blue cones) | #008DA0 | 0.144 |
| Achromatopsia (no color) | #757575 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2371E4
#2371E4
oklch(56.8% 0.19 258.9)
- #9C6D00
#9C6D00
oklch(56.9% 0.118 78.8)
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 #2371E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.020
- Royal Blue #4169E1 ΔE 0.026
- Clear Blue #247AFD ΔE 0.043
- Neon Blue #4361EE ΔE 0.045
- Bright Blue #0165FC ΔE 0.049
- Azul #1D5DEC ΔE 0.051
- Windows Blue #3778BF ΔE 0.064
- Warm Blue #4B57DB ΔE 0.065
Use #2371E4 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.