#303659
Closest named color: Prussian Blue (#1D3557). oklch(34.5% 0.062 275.3), rgb(48, 54, 89).
Aa
White text reads best on this color (11.68:1).
About this color
#303659 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.062 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 11.68:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.68:1 |
Values
| HEX | #303659 |
| RGB | rgb(48, 54, 89) |
| HSL | hsl(231, 30%, 27%) |
| OKLCH | oklch(34.5% 0.062 275.3) |
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 #303659 | 11.68:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #303659 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #303659 text on white | 11.68:1 | AAA | Lc 96.8 | Preferred for body text |
| #303659 text on black | 1.79:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B8BFDF
oklch(81% 0.046 275.6)
-
Step 400
400
#939DCF
oklch(70.6% 0.074 275.6)
-
Step 500
500
#7985C3
oklch(63.2% 0.094 275)
-
Step 600
600
#626DAF
oklch(55.5% 0.103 275.3)
-
Step 700
700
#515B97
oklch(49.1% 0.097 275.1)
-
Step 800
800
#434B7A
oklch(42.8% 0.079 275.2)
-
Step 900
900 (this color)
#303659
oklch(34.5% 0.062 275.3)
-
Step 950
950
#21253A
oklch(27.1% 0.04 275.2)
#303659 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) | #2A3A5A | 0.014 |
| Deuteranopia (no green cones) | #263758 | 0.015 |
| Tritanopia (no blue cones) | #233D43 | 0.054 |
| Achromatopsia (no color) | #383838 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303659
#303659
oklch(34.5% 0.062 275.3)
- #43390D
#43390D
oklch(34.6% 0.062 96)
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 #303659, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.038
- Gunmetal #293241 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.050
- Onyx #343A40 ΔE 0.050
- Marine Blue #01386A ΔE 0.051
- Midnight Green #073B4C ΔE 0.053
Use #303659 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.