#2371EC
Closest named color: Cerulean Blue (#056EEE). oklch(57.4% 0.2 259.7), rgb(35, 113, 236).
Aa
Black text reads best on this color (4.64:1).
About this color
#2371EC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.200 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.014 away. Black text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.200) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #2371EC |
| RGB | rgb(35, 113, 236) |
| HSL | hsl(217, 84%, 53%) |
| OKLCH | oklch(57.4% 0.2 259.7) |
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 #2371EC | 4.52:1 | AA | Lc -76.2 | Fine for body text |
| Black text on #2371EC | 4.64:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #2371EC text on white | 4.52:1 | AA | Lc 70.7 | Content text, not long reading |
| #2371EC text on black | 4.64:1 | AA | Lc -30.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFB
oklch(88.4% 0.051 260.4)
-
Step 300
300
#9EC2FB
oklch(80.9% 0.09 259.4)
-
Step 400
400
#69A0FA
oklch(70.7% 0.145 259.8)
-
Step 500
500
#3F85F7
oklch(63.1% 0.185 259.7)
-
Step 600
600 (this color)
#2371EC
oklch(57.4% 0.2 259.7)
-
Step 700
700
#0E58C8
oklch(49.1% 0.187 259.9)
-
Step 800
800
#1049A1
oklch(42.7% 0.154 259.7)
-
Step 900
900
#163E80
oklch(37.7% 0.12 260)
-
Step 950
950
#0E254B
oklch(27% 0.076 259.9)
#2371EC 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) | #0E80F0 | 0.037 |
| Deuteranopia (no green cones) | #006EEA | 0.015 |
| Tritanopia (no blue cones) | #008FA4 | 0.152 |
| Achromatopsia (no color) | #767676 | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2371EC
#2371EC
oklch(57.4% 0.2 259.7)
- #9D6F00
#9D6F00
oklch(57.4% 0.119 79.8)
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 #2371EC, closest first.
No curated palette has a color within ΔE 0.04 of #2371EC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.014
- Royal Blue #4169E1 ΔE 0.029
- Clear Blue #247AFD ΔE 0.033
- Neon Blue #4361EE ΔE 0.041
- Bright Blue #0165FC ΔE 0.041
- Azul #1D5DEC ΔE 0.049
- Warm Blue #4B57DB ΔE 0.067
- Windows Blue #3778BF ΔE 0.075
Use #2371EC 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.