#09739E
Closest named color: Ocean Blue (#03719C). oklch(52.4% 0.107 234), rgb(9, 115, 158).
Aa
White text reads best on this color (5.30:1).
About this color
#09739E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.107 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.007 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #09739E |
| RGB | rgb(9, 115, 158) |
| HSL | hsl(197, 89%, 33%) |
| OKLCH | oklch(52.4% 0.107 234) |
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 #09739E | 5.30:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #09739E | 3.95:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #09739E text on white | 5.30:1 | AA | Lc 75.9 | Fine for body text |
| #09739E text on black | 3.95:1 | AA large text | Lc -25.9 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C6DB
oklch(80.8% 0.048 234.5)
-
Step 400
400
#6FA9CA
oklch(70.7% 0.077 234.4)
-
Step 500
500
#4493BC
oklch(63.1% 0.099 234)
-
Step 600
600 (this color)
#09739E
oklch(52.4% 0.107 234)
-
Step 700
700
#0A6990
oklch(49.1% 0.099 233.7)
-
Step 800
800
#105675
oklch(42.8% 0.082 233.5)
-
Step 900
900
#18475E
oklch(37.7% 0.064 233.4)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#09739E 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) | #5E72A0 | 0.067 |
| Deuteranopia (no green cones) | #4B669D | 0.054 |
| Tritanopia (no blue cones) | #007E82 | 0.064 |
| Achromatopsia (no color) | #6B6B6B | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #09739E
#09739E
oklch(52.4% 0.107 234)
- #995726
#995726
oklch(52.4% 0.107 54.1)
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 #09739E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.007
- Sea Blue #047495 ΔE 0.016
- Muted Blue #3B719F ΔE 0.027
- Nice Blue #107AB0 ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.034
- Ocean #017B92 ΔE 0.035
- Peacock Blue #016795 ΔE 0.037
- Dull Blue #49759C ΔE 0.042
Use #09739E 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.