#171B48
Closest named color: Dark Indigo (#1F0954). oklch(24.9% 0.083 274.8), rgb(23, 27, 72).
Aa
White text reads best on this color (16.31:1).
About this color
#171B48 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.083 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.045 away. White text reads best on it, at 16.31:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.28:1 |
| White text | 16.31:1 |
Values
| HEX | #171B48 |
| RGB | rgb(23, 27, 72) |
| HSL | hsl(235, 52%, 19%) |
| OKLCH | oklch(24.9% 0.083 274.8) |
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 #171B48 | 16.31:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #171B48 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #171B48 text on white | 16.31:1 | AAA | Lc 103.1 | Preferred for body text |
| #171B48 text on black | 1.28:1 | 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
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FE
oklch(88.5% 0.055 275)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8596FF
oklch(70.6% 0.154 274.8)
-
Step 500
500
#6A78FF
oklch(63.2% 0.198 274.8)
-
Step 600
600
#545BEF
oklch(55.5% 0.218 274.7)
-
Step 700
700
#4649D0
oklch(49% 0.203 275)
-
Step 800
800
#393DA8
oklch(42.6% 0.168 275)
-
Step 900
900
#303685
oklch(37.7% 0.131 274.9)
-
Step 950
950 (this color)
#171B48
oklch(24.9% 0.083 274.8)
#171B48 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) | #00224A | 0.030 |
| Deuteranopia (no green cones) | #001E47 | 0.027 |
| Tritanopia (no blue cones) | #00262E | 0.072 |
| Achromatopsia (no color) | #202020 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171B48
#171B48
oklch(24.9% 0.083 274.8)
- #292100
#292100
oklch(25% 0.051 95.7)
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 #171B48, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.045
- Navy Blue #001146 ΔE 0.047
- Oxford Blue #1B263B ΔE 0.047
- Dark #1B2431 ΔE 0.058
- Rich Black #0D1B2A ΔE 0.061
- Marine #042E60 ΔE 0.067
- Night Blue #040348 ΔE 0.070
- Darkblue #030764 ΔE 0.071
Use #171B48 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.