#237FDE
Closest named color: Water Blue (#0E87CC). oklch(59.4% 0.167 253.4), rgb(35, 127, 222).
Aa
Black text reads best on this color (5.16:1).
About this color
#237FDE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.167 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.039 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #237FDE |
| RGB | rgb(35, 127, 222) |
| HSL | hsl(210, 74%, 50%) |
| OKLCH | oklch(59.4% 0.167 253.4) |
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 #237FDE | 4.06:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #237FDE | 5.16:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #237FDE text on white | 4.06:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #237FDE text on black | 5.16:1 | AA | Lc -34.3 | 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
#C5DCF7
oklch(88.6% 0.045 252.5)
-
Step 300
300
#9CC4F5
oklch(80.9% 0.082 253.8)
-
Step 400
400
#63A4F0
oklch(70.8% 0.131 253.4)
-
Step 500
500 (this color)
#237FDE
oklch(59.4% 0.167 253.4)
-
Step 600
600
#0073D5
oklch(55.7% 0.173 253.3)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900
#0B4279
oklch(37.8% 0.108 253.2)
-
Step 950
950
#0A2747
oklch(27.1% 0.069 253.6)
#237FDE 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) | #4E87E2 | 0.041 |
| Deuteranopia (no green cones) | #2976DC | 0.023 |
| Tritanopia (no blue cones) | #0096A4 | 0.124 |
| Achromatopsia (no color) | #7E7E7E | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237FDE
#237FDE
oklch(59.4% 0.167 253.4)
- #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 #237FDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.039
- Windows Blue #3778BF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.049
- Clear Blue #247AFD ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.055
- Royal Blue #4169E1 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.062
- Soft Blue #6488EA ΔE 0.065
Use #237FDE 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.