#1F2339
Closest named color: Oxford Blue (#1B263B). oklch(26.3% 0.042 275.3), rgb(31, 35, 57).
Aa
White text reads best on this color (15.46:1).
About this color
#1F2339 is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.042 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.011 away. White text reads best on it, at 15.46:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.35:1 |
| White text | 15.46:1 |
Values
| HEX | #1F2339 |
| RGB | rgb(31, 35, 57) |
| HSL | hsl(231, 30%, 17%) |
| OKLCH | oklch(26.3% 0.042 275.3) |
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 #1F2339 | 15.46:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #1F2339 | 1.35:1 | Fails | Lc 0.0 | Not readable |
| #1F2339 text on white | 15.46:1 | AAA | Lc 102.4 | Preferred for body text |
| #1F2339 text on black | 1.35:1 | 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
#D4D8EC
oklch(88.5% 0.028 276.8)
-
Step 300
300
#B7BFE1
oklch(81% 0.049 274.8)
-
Step 400
400
#929DD2
oklch(70.7% 0.079 275.1)
-
Step 500
500
#7884C6
oklch(63.1% 0.1 275.3)
-
Step 600
600
#616DB3
oklch(55.6% 0.109 274.9)
-
Step 700
700
#515B9A
oklch(49.2% 0.101 275.2)
-
Step 800
800
#424A7D
oklch(42.7% 0.085 275.5)
-
Step 900
900
#383E64
oklch(37.7% 0.065 276)
-
Step 950
950 (this color)
#1F2339
oklch(26.3% 0.042 275.3)
#1F2339 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) | #1C253A | 0.008 |
| Deuteranopia (no green cones) | #1A2338 | 0.008 |
| Tritanopia (no blue cones) | #17272B | 0.036 |
| Achromatopsia (no color) | #242424 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2339
#1F2339
oklch(26.3% 0.042 275.3)
- #2B250B
#2B250B
oklch(26.5% 0.042 96.4)
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 #1F2339, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.011
- Dark #1B2431 ΔE 0.018
- Jet #212529 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.042
- Rich Black #0D1B2A ΔE 0.049
- Gunmetal #293241 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.071
- Marine #042E60 ΔE 0.075
Use #1F2339 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.