#1F173C
Closest named color: Oxford Blue (#1B263B). oklch(23.7% 0.068 290.1), rgb(31, 23, 60).
Aa
White text reads best on this color (16.85:1).
About this color
#1F173C is a very dark, muted purple. In OKLCH its lightness is 24%, its chroma 0.068 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.049 away. White text reads best on it, at 16.85:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | muted (0.068) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.24:1 |
| White text | 16.85:1 |
Values
| HEX | #1F173C |
| RGB | rgb(31, 23, 60) |
| HSL | hsl(253, 45%, 16%) |
| OKLCH | oklch(23.7% 0.068 290.1) |
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 #1F173C | 16.85:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #1F173C | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #1F173C text on white | 16.85:1 | AAA | Lc 103.6 | Preferred for body text |
| #1F173C 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F9
oklch(93.7% 0.023 288.7)
-
Step 200
200
#D8D5F6
oklch(88.6% 0.045 289.6)
-
Step 300
300
#BFB8F2
oklch(80.8% 0.081 290)
-
Step 400
400
#A091EB
oklch(70.6% 0.13 290.3)
-
Step 500
500
#8A73E5
oklch(63% 0.166 290.1)
-
Step 600
600
#7659D3
oklch(55.7% 0.18 290.3)
-
Step 700
700
#6348B7
oklch(49.1% 0.168 290)
-
Step 800
800
#513C94
oklch(42.8% 0.139 290.3)
-
Step 900
900
#423476
oklch(37.6% 0.109 289.9)
-
Step 950
950 (this color)
#1F173C
oklch(23.7% 0.068 290.1)
#1F173C 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) | #061E3D | 0.040 |
| Deuteranopia (no green cones) | #071C3B | 0.038 |
| Tritanopia (no blue cones) | #171F26 | 0.057 |
| Achromatopsia (no color) | #1D1D1D | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F173C
#1F173C
oklch(23.7% 0.068 290.1)
- #202000
#202000
oklch(23.6% 0.051 109.8)
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 #1F173C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.049
- Rich Black #0D1B2A ΔE 0.050
- Dark #1B2431 ΔE 0.052
- Dark Indigo #1F0954 ΔE 0.054
- Midnight Purple #280137 ΔE 0.055
- Very Dark Purple #2A0134 ΔE 0.057
- Dark Purple #35063E ΔE 0.058
- Navy Blue #001146 ΔE 0.059
Use #1F173C 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.