#303669
Closest named color: Prussian Blue (#1D3557). oklch(35.5% 0.088 275.9), rgb(48, 54, 105).
Aa
White text reads best on this color (11.30:1).
About this color
#303669 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.088 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.042 away. White text reads best on it, at 11.30:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.85:1 |
| White text | 11.30:1 |
Values
| HEX | #303669 |
| RGB | rgb(48, 54, 105) |
| HSL | hsl(234, 37%, 30%) |
| OKLCH | oklch(35.5% 0.088 275.9) |
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 #303669 | 11.30:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #303669 | 1.85:1 | Fails | Lc 7.9 | Not readable |
| #303669 text on white | 11.30:1 | AAA | Lc 95.9 | Preferred for body text |
| #303669 text on black | 1.85:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B4BEEC
oklch(80.9% 0.066 275.3)
-
Step 400
400
#8E9BE2
oklch(70.7% 0.105 275.4)
-
Step 500
500
#7480DA
oklch(63.1% 0.135 276.1)
-
Step 600
600
#5E68C7
oklch(55.6% 0.146 276.1)
-
Step 700
700
#4D56AC
oklch(49.1% 0.136 275.7)
-
Step 800
800
#3F478C
oklch(42.8% 0.113 275.6)
-
Step 900
900 (this color)
#303669
oklch(35.5% 0.088 275.9)
-
Step 950
950
#1F2341
oklch(26.9% 0.056 276.2)
#303669 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) | #203D6B | 0.026 |
| Deuteranopia (no green cones) | #1A3868 | 0.028 |
| Tritanopia (no blue cones) | #18414A | 0.078 |
| Achromatopsia (no color) | #3A3A3A | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303669
#303669
oklch(35.5% 0.088 275.9)
- #473B00
#473B00
oklch(35.4% 0.073 96.2)
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 #303669, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.042
- Marine Blue #01386A ΔE 0.044
- Twilight Blue #0A437A ΔE 0.051
- Marine #042E60 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.071
- Charcoal #264653 ΔE 0.071
Use #303669 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.