#1C173F
Closest named color: Dark Indigo (#1F0954). oklch(23.6% 0.073 285), rgb(28, 23, 63).
Aa
White text reads best on this color (16.88:1).
About this color
#1C173F is a very dark, moderately saturated purple. In OKLCH its lightness is 24%, its chroma 0.073 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.048 away. White text reads best on it, at 16.88:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.24:1 |
| White text | 16.88:1 |
Values
| HEX | #1C173F |
| RGB | rgb(28, 23, 63) |
| HSL | hsl(248, 47%, 17%) |
| OKLCH | oklch(23.6% 0.073 285) |
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 #1C173F | 16.88:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #1C173F | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #1C173F text on white | 16.88:1 | AAA | Lc 103.7 | Preferred for body text |
| #1C173F text on black | 1.24:1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D5D5F9
oklch(88.4% 0.049 285.3)
-
Step 300
300
#BAB9F7
oklch(80.8% 0.087 285)
-
Step 400
400
#9893F3
oklch(70.7% 0.138 284.7)
-
Step 500
500
#8174EF
oklch(63.1% 0.178 284.9)
-
Step 600
600
#6D59DD
oklch(55.6% 0.193 285.2)
-
Step 700
700
#5B48C0
oklch(49.1% 0.18 284.9)
-
Step 800
800
#4A3C9B
oklch(42.7% 0.148 284.9)
-
Step 900
900
#3D357B
oklch(37.7% 0.115 284.7)
-
Step 950
950 (this color)
#1C173F
oklch(23.6% 0.073 285)
#1C173F 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) | #021E40 | 0.038 |
| Deuteranopia (no green cones) | #011C3E | 0.038 |
| Tritanopia (no blue cones) | #102028 | 0.062 |
| Achromatopsia (no color) | #1D1D1D | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C173F
#1C173F
oklch(23.6% 0.073 285)
- #221F00
#221F00
oklch(23.5% 0.05 104.4)
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 #1C173F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.048
- Oxford Blue #1B263B ΔE 0.050
- Navy Blue #001146 ΔE 0.051
- Rich Black #0D1B2A ΔE 0.052
- Dark #1B2431 ΔE 0.055
- Midnight Purple #280137 ΔE 0.058
- Very Dark Purple #2A0134 ΔE 0.061
- Dark Purple #35063E ΔE 0.063
Use #1C173F 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.