#1D1F3F
Closest named color: Oxford Blue (#1B263B). oklch(25.6% 0.06 278.6), rgb(29, 31, 63).
Aa
White text reads best on this color (15.90:1).
About this color
#1D1F3F is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.060 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.026 away. White text reads best on it, at 15.90:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.90:1 |
Values
| HEX | #1D1F3F |
| RGB | rgb(29, 31, 63) |
| HSL | hsl(236, 37%, 18%) |
| OKLCH | oklch(25.6% 0.06 278.6) |
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 #1D1F3F | 15.90:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #1D1F3F | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #1D1F3F text on white | 15.90:1 | AAA | Lc 102.8 | Preferred for body text |
| #1D1F3F text on black | 1.32:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B6BDEE
oklch(81% 0.07 278.4)
-
Step 400
400
#9199E6
oklch(70.7% 0.113 278.6)
-
Step 500
500
#777EDF
oklch(63.2% 0.144 278.3)
-
Step 600
600
#6165CC
oklch(55.6% 0.156 278.3)
-
Step 700
700
#5153B1
oklch(49.1% 0.146 278.6)
-
Step 800
800
#42448F
oklch(42.6% 0.121 278.8)
-
Step 900
900
#373A72
oklch(37.6% 0.094 278.5)
-
Step 950
950 (this color)
#1D1F3F
oklch(25.6% 0.06 278.6)
#1D1F3F 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) | #122340 | 0.019 |
| Deuteranopia (no green cones) | #0F213E | 0.021 |
| Tritanopia (no blue cones) | #11262B | 0.054 |
| Achromatopsia (no color) | #222222 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D1F3F
#1D1F3F
oklch(25.6% 0.06 278.6)
- #2A2300
#2A2300
oklch(25.6% 0.053 98)
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 #1D1F3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.026
- Dark #1B2431 ΔE 0.035
- Rich Black #0D1B2A ΔE 0.050
- Jet #212529 ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.054
- Dark Indigo #1F0954 ΔE 0.065
- Navy Blue #001146 ΔE 0.066
- Gunmetal #293241 ΔE 0.068
Use #1D1F3F 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.