#1F1840
Closest named color: Oxford Blue (#1B263B). oklch(24.2% 0.073 287.7), rgb(31, 24, 64).
Aa
White text reads best on this color (16.62:1).
About this color
#1F1840 is a very dark, moderately saturated purple. In OKLCH its lightness is 24%, its chroma 0.073 and its hue 288°. 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 16.62:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.62:1 |
Values
| HEX | #1F1840 |
| RGB | rgb(31, 24, 64) |
| HSL | hsl(251, 45%, 17%) |
| OKLCH | oklch(24.2% 0.073 287.7) |
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 #1F1840 | 16.62:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #1F1840 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #1F1840 text on white | 16.62:1 | AAA | Lc 103.4 | Preferred for body text |
| #1F1840 text on black | 1.26:1 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D7D5F8
oklch(88.6% 0.048 288)
-
Step 300
300
#BDB8F6
oklch(80.8% 0.087 288)
-
Step 400
400
#9D91F2
oklch(70.7% 0.139 288)
-
Step 500
500
#8673ED
oklch(63.2% 0.177 287.4)
-
Step 600
600
#7257DB
oklch(55.6% 0.193 287.8)
-
Step 700
700
#6046BE
oklch(49.1% 0.179 287.9)
-
Step 800
800
#4E3B9A
oklch(42.8% 0.148 287.6)
-
Step 900
900
#40347A
oklch(37.7% 0.115 287.5)
-
Step 950
950 (this color)
#1F1840
oklch(24.2% 0.073 287.7)
#1F1840 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) | #041F41 | 0.040 |
| Deuteranopia (no green cones) | #041D3F | 0.039 |
| Tritanopia (no blue cones) | #152129 | 0.061 |
| Achromatopsia (no color) | #1E1E1E | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F1840
#1F1840
oklch(24.2% 0.073 287.7)
- #232100
#232100
oklch(24.2% 0.052 106.4)
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 #1F1840, 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 0.049
- Dark #1B2431 ΔE 0.053
- Rich Black #0D1B2A ΔE 0.055
- Navy Blue #001146 ΔE 0.057
- Midnight Purple #280137 ΔE 0.058
- Dark Purple #35063E ΔE 0.059
- Very Dark Purple #2A0134 ΔE 0.061
Use #1F1840 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.