#237D9E
Closest named color: Ocean (#017B92). oklch(55.3% 0.096 227.5), rgb(35, 125, 158).
Aa
White text reads best on this color (4.66:1).
About this color
#237D9E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 55%, its chroma 0.096 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.024 away. White text reads best on it, at 4.66:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.49:1 |
| White text | 4.66:1 |
Values
| HEX | #237D9E |
| RGB | rgb(35, 125, 158) |
| HSL | hsl(196, 64%, 38%) |
| OKLCH | oklch(55.3% 0.096 227.5) |
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 #237D9E | 4.66:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #237D9E | 4.49:1 | AA large text | Lc 32.0 | Non-text elements, placeholder text |
| #237D9E text on white | 4.66:1 | AA | Lc 72.1 | Content text, not long reading |
| #237D9E text on black | 4.49:1 | AA large text | Lc -29.6 | Dividers and decoration only |
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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A4C7D7
oklch(80.9% 0.044 227.3)
-
Step 400
400
#72AAC2
oklch(70.8% 0.068 226.8)
-
Step 500
500
#4894B3
oklch(63.1% 0.088 227.4)
-
Step 600
600 (this color)
#237D9E
oklch(55.3% 0.096 227.5)
-
Step 700
700
#146A88
oklch(49.1% 0.089 227.6)
-
Step 800
800
#16576E
oklch(42.8% 0.073 226.5)
-
Step 900
900
#1A4759
oklch(37.5% 0.057 227.7)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#237D9E 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) | #6B7BA0 | 0.069 |
| Deuteranopia (no green cones) | #5B6F9E | 0.060 |
| Tritanopia (no blue cones) | #008688 | 0.052 |
| Achromatopsia (no color) | #747474 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237D9E
#237D9E
oklch(55.3% 0.096 227.5)
- #A0603F
#A0603F
oklch(55.4% 0.096 47.3)
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 #237D9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.024
- Cerulean #457B9D ΔE 0.024
- Sea Blue #047495 ΔE 0.032
- Teal Blue #01889F ΔE 0.033
- Nice Blue #107AB0 ΔE 0.033
- Dull Blue #49759C ΔE 0.034
- Stormy Blue #507B9C ΔE 0.035
- Muted Blue #3B719F ΔE 0.037
Use #237D9E 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.