#1F2139
Closest named color: Oxford Blue (#1B263B). oklch(25.8% 0.045 279.1), rgb(31, 33, 57).
Aa
White text reads best on this color (15.73:1).
About this color
#1F2139 is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.045 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.017 away. White text reads best on it, at 15.73:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.33:1 |
| White text | 15.73:1 |
Values
| HEX | #1F2139 |
| RGB | rgb(31, 33, 57) |
| HSL | hsl(235, 30%, 17%) |
| OKLCH | oklch(25.8% 0.045 279.1) |
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 #1F2139 | 15.73:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #1F2139 | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #1F2139 text on white | 15.73:1 | AAA | Lc 102.6 | Preferred for body text |
| #1F2139 text on black | 1.33:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D4D8ED
oklch(88.6% 0.029 277.2)
-
Step 300
300
#B9BEE3
oklch(81% 0.052 279.1)
-
Step 400
400
#959BD5
oklch(70.6% 0.085 279.4)
-
Step 500
500
#7C82CA
oklch(63.2% 0.108 279.2)
-
Step 600
600
#656AB7
oklch(55.5% 0.119 279)
-
Step 700
700
#54589E
oklch(49.1% 0.111 279)
-
Step 800
800
#454880
oklch(42.7% 0.092 279.4)
-
Step 900
900
#3A3D67
oklch(37.8% 0.071 279.3)
-
Step 950
950 (this color)
#1F2139
oklch(25.8% 0.045 279.1)
#1F2139 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) | #19243A | 0.013 |
| Deuteranopia (no green cones) | #172238 | 0.013 |
| Tritanopia (no blue cones) | #17262A | 0.040 |
| Achromatopsia (no color) | #232323 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2139
#1F2139
oklch(25.8% 0.045 279.1)
- #292407
#292407
oklch(25.9% 0.045 99.5)
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 #1F2139, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.017
- Dark #1B2431 ΔE 0.022
- Jet #212529 ΔE 0.037
- Rich Black #0D1B2A ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.047
- Gunmetal #293241 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.076
- Eggplant #380835 ΔE 0.077
Use #1F2139 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.