#1C183F
Closest named color: Oxford Blue (#1B263B). oklch(23.9% 0.072 284.2), rgb(28, 24, 63).
Aa
White text reads best on this color (16.77:1).
About this color
#1C183F is a very dark, moderately saturated purple. In OKLCH its lightness is 24%, its chroma 0.072 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.047 away. White text reads best on it, at 16.77:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.25:1 |
| White text | 16.77:1 |
Values
| HEX | #1C183F |
| RGB | rgb(28, 24, 63) |
| HSL | hsl(246, 45%, 17%) |
| OKLCH | oklch(23.9% 0.072 284.2) |
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 #1C183F | 16.77:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #1C183F | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #1C183F text on white | 16.77:1 | AAA | Lc 103.6 | Preferred for body text |
| #1C183F text on black | 1.25:1 | 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
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D5D6F8
oklch(88.6% 0.047 284.1)
-
Step 300
300
#B9BAF6
oklch(80.9% 0.084 283.6)
-
Step 400
400
#9793F2
oklch(70.6% 0.137 284.2)
-
Step 500
500
#8076ED
oklch(63.2% 0.173 284.1)
-
Step 600
600
#6B5BDB
oklch(55.6% 0.188 284.1)
-
Step 700
700
#5A49BE
oklch(49% 0.176 284.5)
-
Step 800
800
#493D9A
oklch(42.7% 0.146 284.2)
-
Step 900
900
#3C357A
oklch(37.6% 0.113 284.1)
-
Step 950
950 (this color)
#1C183F
oklch(23.9% 0.072 284.2)
#1C183F 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) | #041F40 | 0.036 |
| Deuteranopia (no green cones) | #031C3E | 0.035 |
| Tritanopia (no blue cones) | #102128 | 0.062 |
| Achromatopsia (no color) | #1D1D1D | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C183F
#1C183F
oklch(23.9% 0.072 284.2)
- #232000
#232000
oklch(23.9% 0.051 104.5)
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 #1C183F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.050
- Rich Black #0D1B2A ΔE 0.051
- Dark #1B2431 ΔE 0.052
- Navy Blue #001146 ΔE 0.052
- Midnight Purple #280137 ΔE 0.060
- Very Dark Purple #2A0134 ΔE 0.064
- Dark Purple #35063E ΔE 0.064
Use #1C183F 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.