#1F253F
Closest named color: Oxford Blue (#1B263B). oklch(27.2% 0.049 272.9), rgb(31, 37, 63).
Aa
White text reads best on this color (15.05:1).
About this color
#1F253F is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.049 and its hue 273°. 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 15.05:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.39:1 |
| White text | 15.05:1 |
Values
| HEX | #1F253F |
| RGB | rgb(31, 37, 63) |
| HSL | hsl(229, 34%, 18%) |
| OKLCH | oklch(27.2% 0.049 272.9) |
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 #1F253F | 15.05:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #1F253F | 1.39:1 | Fails | Lc 0.0 | Not readable |
| #1F253F text on white | 15.05:1 | AAA | Lc 101.9 | Preferred for body text |
| #1F253F text on black | 1.39:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B4BFE7
oklch(81% 0.058 273)
-
Step 400
400
#8D9DDB
oklch(70.7% 0.093 272.7)
-
Step 500
500
#7283D1
oklch(63% 0.119 273.2)
-
Step 600
600
#5B6CBE
oklch(55.7% 0.128 272.8)
-
Step 700
700
#4B59A4
oklch(49% 0.121 273.2)
-
Step 800
800
#3D4985
oklch(42.6% 0.1 272.9)
-
Step 900
900
#343E6B
oklch(37.8% 0.078 272.7)
-
Step 950
950 (this color)
#1F253F
oklch(27.2% 0.049 272.9)
#1F253F 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) | #1C2840 | 0.010 |
| Deuteranopia (no green cones) | #19253E | 0.009 |
| Tritanopia (no blue cones) | #142A2F | 0.042 |
| Achromatopsia (no color) | #262626 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F253F
#1F253F
oklch(27.2% 0.049 272.9)
- #2F2606
#2F2606
oklch(27.2% 0.049 93)
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 #1F253F, 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 0.028
- Space Cadet #2B2D42 ΔE 0.035
- Jet #212529 ΔE 0.042
- Gunmetal #293241 ΔE 0.048
- Rich Black #0D1B2A ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.060
- Marine #042E60 ΔE 0.064
Use #1F253F 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.