#237DE5
Closest named color: Clear Blue (#247AFD). oklch(59.5% 0.178 255.4), rgb(35, 125, 229).
Aa
Black text reads best on this color (5.13:1).
About this color
#237DE5 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.178 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.038 away. Black text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.13:1 |
| White text | 4.08:1 |
Values
| HEX | #237DE5 |
| RGB | rgb(35, 125, 229) |
| HSL | hsl(212, 79%, 52%) |
| OKLCH | oklch(59.5% 0.178 255.4) |
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 #237DE5 | 4.08:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #237DE5 | 5.13:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #237DE5 text on white | 4.08:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #237DE5 text on black | 5.13:1 | AA | Lc -34.2 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DBF9
oklch(88.4% 0.048 255.1)
-
Step 300
300
#9BC4F8
oklch(81% 0.086 254.6)
-
Step 400
400
#62A3F5
oklch(70.8% 0.138 255)
-
Step 500
500 (this color)
#237DE5
oklch(59.5% 0.178 255.4)
-
Step 600
600
#0070DC
oklch(55.6% 0.186 255.4)
-
Step 700
700
#005EBB
oklch(49.1% 0.165 255.5)
-
Step 800
800
#004D9A
oklch(42.7% 0.142 255.2)
-
Step 900
900
#0B407D
oklch(37.6% 0.116 255.7)
-
Step 950
950
#092649
oklch(26.9% 0.074 255.3)
#237DE5 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) | #4487E9 | 0.038 |
| Deuteranopia (no green cones) | #0D76E3 | 0.022 |
| Tritanopia (no blue cones) | #0096A6 | 0.133 |
| Achromatopsia (no color) | #7D7D7D | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237DE5
#237DE5
oklch(59.5% 0.178 255.4)
- #A97200
#A97200
oklch(59.5% 0.125 75.4)
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 #237DE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.038
- Cerulean Blue #056EEE ΔE 0.045
- Royal Blue #4169E1 ΔE 0.050
- Water Blue #0E87CC ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.054
- Windows Blue #3778BF ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.059
- Soft Blue #6488EA ΔE 0.066
Use #237DE5 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.