#237FE0
Closest named color: Water Blue (#0E87CC). oklch(59.6% 0.169 253.8), rgb(35, 127, 224).
Aa
Black text reads best on this color (5.18:1).
About this color
#237FE0 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.169 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.041 away. Black text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.18:1 |
| White text | 4.05:1 |
Values
| HEX | #237FE0 |
| RGB | rgb(35, 127, 224) |
| HSL | hsl(211, 75%, 51%) |
| OKLCH | oklch(59.6% 0.169 253.8) |
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 #237FE0 | 4.05:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #237FE0 | 5.18:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #237FE0 text on white | 4.05:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #237FE0 text on black | 5.18:1 | AA | Lc -34.5 | 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 500.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9CC4F6
oklch(80.9% 0.083 254.3)
-
Step 400
400
#62A4F1
oklch(70.8% 0.132 253.4)
-
Step 500
500 (this color)
#237FE0
oklch(59.6% 0.169 253.8)
-
Step 600
600
#0072D6
oklch(55.6% 0.176 253.8)
-
Step 700
700
#0060B5
oklch(49.2% 0.155 253.6)
-
Step 800
800
#004E96
oklch(42.7% 0.135 253.8)
-
Step 900
900
#0A417A
oklch(37.6% 0.111 254)
-
Step 950
950
#092747
oklch(27% 0.069 253.1)
#237FE0 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) | #4D87E4 | 0.040 |
| Deuteranopia (no green cones) | #2576DE | 0.024 |
| Tritanopia (no blue cones) | #0096A4 | 0.126 |
| Achromatopsia (no color) | #7E7E7E | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237FE0
#237FE0
oklch(59.6% 0.169 253.8)
- #AB7100
#AB7100
oklch(59.5% 0.126 73.6)
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 #237FE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.041
- Clear Blue #247AFD ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.049
- Windows Blue #3778BF ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.053
- Royal Blue #4169E1 ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.060
- Soft Blue #6488EA ΔE 0.065
Use #237FE0 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.