#237CDD
Closest named color: Water Blue (#0E87CC). oklch(58.7% 0.169 254.3), rgb(35, 124, 221).
Aa
Black text reads best on this color (4.99:1).
About this color
#237CDD is a medium-dark, vivid blue. In OKLCH its lightness is 59%, 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 0.043 away. Black text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #237CDD |
| RGB | rgb(35, 124, 221) |
| HSL | hsl(211, 73%, 50%) |
| OKLCH | oklch(58.7% 0.169 254.3) |
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 #237CDD | 4.20:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #237CDD | 4.99:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #237CDD text on white | 4.20:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #237CDD text on black | 4.99:1 | AA | Lc -33.2 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#9FC4F1
oklch(80.9% 0.075 253.6)
-
Step 400
400
#6AA3EB
oklch(70.6% 0.122 254.9)
-
Step 500
500
#3E8BE4
oklch(63.2% 0.154 254.1)
-
Step 600
600 (this color)
#237CDD
oklch(58.7% 0.169 254.3)
-
Step 700
700
#025FB6
oklch(49% 0.157 254.3)
-
Step 800
800
#0B4E94
oklch(42.7% 0.131 254.6)
-
Step 900
900
#144276
oklch(37.8% 0.102 254.3)
-
Step 950
950
#0E2745
oklch(27.1% 0.064 254.6)
#237CDD 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) | #4984E1 | 0.038 |
| Deuteranopia (no green cones) | #2074DB | 0.022 |
| Tritanopia (no blue cones) | #0093A2 | 0.125 |
| Achromatopsia (no color) | #7C7C7C | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237CDD
#237CDD
oklch(58.7% 0.169 254.3)
- #A76F00
#A76F00
oklch(58.6% 0.124 74.2)
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 #237CDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.043
- Windows Blue #3778BF ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.049
- Clear Blue #247AFD ΔE 0.049
- Royal Blue #4169E1 ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.068
- Cool Blue #4984B8 ΔE 0.070
Use #237CDD 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.