#23739E
Closest named color: Ocean Blue (#03719C). oklch(52.8% 0.101 237.1), rgb(35, 115, 158).
Aa
White text reads best on this color (5.22:1).
About this color
#23739E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.101 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.014 away. White text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 4.01:1 |
| White text | 5.22:1 |
Values
| HEX | #23739E |
| RGB | rgb(35, 115, 158) |
| HSL | hsl(201, 64%, 38%) |
| OKLCH | oklch(52.8% 0.101 237.1) |
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 #23739E | 5.22:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #23739E | 4.01:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #23739E text on white | 5.22:1 | AA | Lc 75.6 | Fine for body text |
| #23739E text on black | 4.01:1 | AA large text | Lc -26.1 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A6C6DB
oklch(81% 0.045 236.9)
-
Step 400
400
#75A8C9
oklch(70.8% 0.073 237.5)
-
Step 500
500
#4E92BB
oklch(63.2% 0.093 237.2)
-
Step 600
600 (this color)
#23739E
oklch(52.8% 0.101 237.1)
-
Step 700
700
#1F688F
oklch(49.2% 0.093 237)
-
Step 800
800
#1C5574
oklch(42.8% 0.077 236.7)
-
Step 900
900
#1E465E
oklch(37.7% 0.061 237.7)
-
Step 950
950
#132937
oklch(27% 0.038 238.3)
#23739E 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) | #5E73A0 | 0.057 |
| Deuteranopia (no green cones) | #4E679D | 0.047 |
| Tritanopia (no blue cones) | #007E82 | 0.065 |
| Achromatopsia (no color) | #6C6C6C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23739E
#23739E
oklch(52.8% 0.101 237.1)
- #965B2A
#965B2A
oklch(52.8% 0.1 57.7)
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 #23739E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.014
- Muted Blue #3B719F ΔE 0.018
- Sea Blue #047495 ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.031
- Dull Blue #49759C ΔE 0.033
- Ocean #017B92 ΔE 0.036
- Cerulean #457B9D ΔE 0.039
Use #23739E 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.