#0A3F59
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.9% 0.069 236), rgb(10, 63, 89).
Aa
White text reads best on this color (11.24:1).
About this color
#0A3F59 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.069 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.025 away. White text reads best on it, at 11.24:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.24:1 |
Values
| HEX | #0A3F59 |
| RGB | rgb(10, 63, 89) |
| HSL | hsl(200, 80%, 19%) |
| OKLCH | oklch(34.9% 0.069 236) |
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 #0A3F59 | 11.24:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #0A3F59 | 1.86:1 | Fails | Lc 8.3 | Not readable |
| #0A3F59 text on white | 11.24:1 | AAA | Lc 95.6 | Preferred for body text |
| #0A3F59 text on black | 1.86:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DDEA
oklch(88.6% 0.029 234.9)
-
Step 300
300
#A1C6DE
oklch(80.8% 0.052 236.7)
-
Step 400
400
#6CA9CD
oklch(70.7% 0.082 235.5)
-
Step 500
500
#3F93C1
oklch(63.2% 0.106 236)
-
Step 600
600
#127CAD
oklch(55.5% 0.115 236.2)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#085579
oklch(42.6% 0.089 236.7)
-
Step 900
900 (this color)
#0A3F59
oklch(34.9% 0.069 236)
-
Step 950
950
#0E2A39
oklch(27.1% 0.044 235)
#0A3F59 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) | #323F5A | 0.040 |
| Deuteranopia (no green cones) | #283859 | 0.033 |
| Tritanopia (no blue cones) | #004648 | 0.044 |
| Achromatopsia (no color) | #3B3B3B | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A3F59
#0A3F59
oklch(34.9% 0.069 236)
- #553012
#553012
oklch(35% 0.069 56.7)
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 #0A3F59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.025
- Midnight Green #073B4C ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.038
- Marine Blue #01386A ΔE 0.041
- Gunmetal #293241 ΔE 0.055
- Dark Teal #014D4E ΔE 0.056
Use #0A3F59 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.