#1F253A
Closest named color: Oxford Blue (#1B263B). oklch(26.9% 0.04 271.3), rgb(31, 37, 58).
Aa
White text reads best on this color (15.17:1).
About this color
#1F253A is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.040 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.007 away. White text reads best on it, at 15.17:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.38:1 |
| White text | 15.17:1 |
Values
| HEX | #1F253A |
| RGB | rgb(31, 37, 58) |
| HSL | hsl(227, 30%, 17%) |
| OKLCH | oklch(26.9% 0.04 271.3) |
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 #1F253A | 15.17:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #1F253A | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #1F253A text on white | 15.17:1 | AAA | Lc 102.0 | Preferred for body text |
| #1F253A text on black | 1.38:1 | 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B5C0E0
oklch(81% 0.047 270.4)
-
Step 400
400
#8F9ED1
oklch(70.6% 0.077 271.6)
-
Step 500
500
#7486C5
oklch(63.2% 0.097 271.2)
-
Step 600
600
#5D6FB1
oklch(55.7% 0.105 271.1)
-
Step 700
700
#4D5C98
oklch(49% 0.098 271.8)
-
Step 800
800
#3F4C7C
oklch(42.8% 0.081 271.1)
-
Step 900
900
#353F63
oklch(37.6% 0.063 271.3)
-
Step 950
950 (this color)
#1F253A
oklch(26.9% 0.04 271.3)
#1F253A 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) | #1E273B | 0.007 |
| Deuteranopia (no green cones) | #1C253A | 0.005 |
| Tritanopia (no blue cones) | #16292D | 0.035 |
| Achromatopsia (no color) | #262626 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F253A
#1F253A
oklch(26.9% 0.04 271.3)
- #2D250D
#2D250D
oklch(26.7% 0.04 91.1)
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 #1F253A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.007
- Dark #1B2431 ΔE 0.019
- Jet #212529 ΔE 0.032
- Space Cadet #2B2D42 ΔE 0.036
- Gunmetal #293241 ΔE 0.048
- Rich Black #0D1B2A ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.066
- Marine #042E60 ΔE 0.072
Use #1F253A 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.