#1D1B59
Closest named color: Dark Indigo (#1F0954). oklch(27% 0.108 277.8), rgb(29, 27, 89).
Aa
White text reads best on this color (15.51:1).
About this color
#1D1B59 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.108 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.038 away. White text reads best on it, at 15.51:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.35:1 |
| White text | 15.51:1 |
Values
| HEX | #1D1B59 |
| RGB | rgb(29, 27, 89) |
| HSL | hsl(242, 53%, 23%) |
| OKLCH | oklch(27% 0.108 277.8) |
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 #1D1B59 | 15.51:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #1D1B59 | 1.35:1 | Fails | Lc 0.0 | Not readable |
| #1D1B59 text on white | 15.51:1 | AAA | Lc 102.1 | Preferred for body text |
| #1D1B59 text on black | 1.35:1 | 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 950.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E8FF
oklch(93.5% 0.031 277.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B1BBFF
oklch(80.9% 0.097 277.5)
-
Step 400
400
#8B94FF
oklch(70.6% 0.155 278)
-
Step 500
500
#7175FF
oklch(63.1% 0.201 277.7)
-
Step 600
600
#5C4FFF
oklch(55.6% 0.249 277.8)
-
Step 700
700
#4D2EF0
oklch(49.1% 0.264 277.6)
-
Step 800
800
#3E2AC2
oklch(42.7% 0.219 277.6)
-
Step 900
900
#332B98
oklch(37.7% 0.17 277.7)
-
Step 950
950 (this color)
#1D1B59
oklch(27% 0.108 277.8)
#1D1B59 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) | #00275B | 0.040 |
| Deuteranopia (no green cones) | #002158 | 0.034 |
| Tritanopia (no blue cones) | #002B37 | 0.090 |
| Achromatopsia (no color) | #242424 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D1B59
#1D1B59
oklch(27% 0.108 277.8)
- #2E2600
#2E2600
oklch(27% 0.056 97.1)
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 #1D1B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.038
- Midnight Blue #191970 ΔE 0.042
- Marine #042E60 ΔE 0.054
- Darkblue #030764 ΔE 0.060
- Navy Blue #001146 ΔE 0.066
- Dark Royal Blue #02066F ΔE 0.066
- Oxford Blue #1B263B ΔE 0.068
- Deep Blue #040273 ΔE 0.071
Use #1D1B59 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.