#237ED0
Closest named color: Water Blue (#0E87CC). oklch(58.3% 0.15 250.6), rgb(35, 126, 208).
Aa
Black text reads best on this color (4.96:1).
About this color
#237ED0 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.150 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.027 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #237ED0 |
| RGB | rgb(35, 126, 208) |
| HSL | hsl(208, 71%, 48%) |
| OKLCH | oklch(58.3% 0.15 250.6) |
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 #237ED0 | 4.22:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #237ED0 | 4.96:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #237ED0 text on white | 4.22:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #237ED0 text on black | 4.96:1 | AA | Lc -33.0 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C4EB
oklch(80.8% 0.068 250.7)
-
Step 400
400
#6BA5E2
oklch(70.7% 0.109 250.7)
-
Step 500
500
#3F8DD9
oklch(63% 0.138 250.5)
-
Step 600
600 (this color)
#237ED0
oklch(58.3% 0.15 250.6)
-
Step 700
700
#0362AC
oklch(49% 0.14 250.8)
-
Step 800
800
#0C518B
oklch(42.8% 0.115 250.3)
-
Step 900
900
#15436F
oklch(37.6% 0.09 250.8)
-
Step 950
950
#0E2841
oklch(27.1% 0.057 249.9)
#237ED0 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) | #5683D3 | 0.045 |
| Deuteranopia (no green cones) | #3A74CE | 0.028 |
| Tritanopia (no blue cones) | #00929D | 0.110 |
| Achromatopsia (no color) | #7B7B7B | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237ED0
#237ED0
oklch(58.3% 0.15 250.6)
- #A96C00
#A96C00
oklch(58.3% 0.126 70.8)
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 #237ED0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.027
- Windows Blue #3778BF ΔE 0.029
- Nice Blue #107AB0 ΔE 0.051
- Cool Blue #4984B8 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.063
- Blue NCS #118AB2 ΔE 0.064
Use #237ED0 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.