#1F243D
Closest named color: Oxford Blue (#1B263B). oklch(26.8% 0.047 274.2), rgb(31, 36, 61).
Aa
White text reads best on this color (15.23:1).
About this color
#1F243D is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.047 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.010 away. White text reads best on it, at 15.23:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.37:1 |
| White text | 15.23:1 |
Values
| HEX | #1F243D |
| RGB | rgb(31, 36, 61) |
| HSL | hsl(230, 33%, 18%) |
| OKLCH | oklch(26.8% 0.047 274.2) |
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 #1F243D | 15.23:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #1F243D | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #1F243D text on white | 15.23:1 | AAA | Lc 102.1 | Preferred for body text |
| #1F243D text on black | 1.37:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B5BFE5
oklch(81% 0.055 273.5)
-
Step 400
400
#8F9DD9
oklch(70.8% 0.089 273.8)
-
Step 500
500
#7483CE
oklch(63% 0.114 274.1)
-
Step 600
600
#5E6CBB
oklch(55.7% 0.123 274.1)
-
Step 700
700
#4D59A1
oklch(49% 0.116 274.2)
-
Step 800
800
#3F4983
oklch(42.6% 0.097 274.2)
-
Step 900
900
#363E69
oklch(37.8% 0.074 274.3)
-
Step 950
950 (this color)
#1F243D
oklch(26.8% 0.047 274.2)
#1F243D 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) | #1B273E | 0.011 |
| Deuteranopia (no green cones) | #19243C | 0.010 |
| Tritanopia (no blue cones) | #15292D | 0.042 |
| Achromatopsia (no color) | #252525 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F243D
#1F243D
oklch(26.8% 0.047 274.2)
- #2E2507
#2E2507
oklch(26.8% 0.047 92.1)
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 #1F243D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.010
- Dark #1B2431 ΔE 0.024
- Space Cadet #2B2D42 ΔE 0.038
- Jet #212529 ΔE 0.039
- Gunmetal #293241 ΔE 0.051
- Rich Black #0D1B2A ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.065
- Marine #042E60 ΔE 0.068
Use #1F243D 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.