#23729B
Closest named color: Ocean Blue (#03719C). oklch(52.4% 0.098 236.1), rgb(35, 114, 155).
Aa
White text reads best on this color (5.31:1).
About this color
#23729B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.098 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.012 away. White text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.95:1 |
| White text | 5.31:1 |
Values
| HEX | #23729B |
| RGB | rgb(35, 114, 155) |
| HSL | hsl(201, 63%, 37%) |
| OKLCH | oklch(52.4% 0.098 236.1) |
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 #23729B | 5.31:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #23729B | 3.95:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #23729B text on white | 5.31:1 | AA | Lc 76.1 | Fine for body text |
| #23729B text on black | 3.95:1 | AA large text | Lc -25.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A6C6DA
oklch(81% 0.045 235.5)
-
Step 400
400
#75A8C7
oklch(70.7% 0.071 235.8)
-
Step 500
500
#4F92B9
oklch(63.2% 0.09 236.1)
-
Step 600
600 (this color)
#23729B
oklch(52.4% 0.098 236.1)
-
Step 700
700
#20688D
oklch(49.1% 0.091 235.8)
-
Step 800
800
#1D5573
oklch(42.7% 0.076 236.1)
-
Step 900
900
#1F465D
oklch(37.7% 0.059 237.1)
-
Step 950
950
#132936
oklch(26.9% 0.037 236.3)
#23729B 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) | #5E729D | 0.058 |
| Deuteranopia (no green cones) | #4E669A | 0.048 |
| Tritanopia (no blue cones) | #007D80 | 0.064 |
| Achromatopsia (no color) | #6B6B6B | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23729B
#23729B
oklch(52.4% 0.098 236.1)
- #955A2C
#955A2C
oklch(52.5% 0.099 56.3)
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 #23729B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.012
- Sea Blue #047495 ΔE 0.017
- Muted Blue #3B719F ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.030
- Dull Blue #49759C ΔE 0.034
- Ocean #017B92 ΔE 0.035
- Nice Blue #107AB0 ΔE 0.036
- Peacock Blue #016795 ΔE 0.038
Use #23729B 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.