#2373EB
Closest named color: Cerulean Blue (#056EEE). oklch(57.8% 0.197 259.2), rgb(35, 115, 235).
Aa
Black text reads best on this color (4.72:1).
About this color
#2373EB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.197 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.018 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #2373EB |
| RGB | rgb(35, 115, 235) |
| HSL | hsl(216, 83%, 53%) |
| OKLCH | oklch(57.8% 0.197 259.2) |
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 #2373EB | 4.44:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #2373EB | 4.72:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #2373EB text on white | 4.44:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #2373EB text on black | 4.72:1 | AA | Lc -31.5 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9EC2FA
oklch(80.8% 0.089 259.1)
-
Step 400
400
#69A0F8
oklch(70.6% 0.142 259.4)
-
Step 500
500
#3F86F5
oklch(63.2% 0.181 259.2)
-
Step 600
600 (this color)
#2373EB
oklch(57.8% 0.197 259.2)
-
Step 700
700
#0B59C6
oklch(49.1% 0.184 259.2)
-
Step 800
800
#0F4AA0
oklch(42.8% 0.151 259.1)
-
Step 900
900
#153F7F
oklch(37.8% 0.118 259)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#2373EB 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) | #1E81EF | 0.036 |
| Deuteranopia (no green cones) | #006FE9 | 0.017 |
| Tritanopia (no blue cones) | #0090A4 | 0.149 |
| Achromatopsia (no color) | #787878 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2373EB
#2373EB
oklch(57.8% 0.197 259.2)
- #9F7000
#9F7000
oklch(57.8% 0.12 79.5)
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 #2373EB, closest first.
No curated palette has a color within ΔE 0.04 of #2373EB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.018
- Royal Blue #4169E1 ΔE 0.031
- Clear Blue #247AFD ΔE 0.031
- Neon Blue #4361EE ΔE 0.045
- Bright Blue #0165FC ΔE 0.046
- Azul #1D5DEC ΔE 0.054
- Warm Blue #4B57DB ΔE 0.071
- Windows Blue #3778BF ΔE 0.072
Use #2373EB 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.