#01275B
Closest named color: Marine (#042E60). oklch(28.4% 0.102 257.8), rgb(1, 39, 91).
Aa
White text reads best on this color (14.55:1).
About this color
#01275B is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.102 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.023 away. White text reads best on it, at 14.55:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.44:1 |
| White text | 14.55:1 |
Values
| HEX | #01275B |
| RGB | rgb(1, 39, 91) |
| HSL | hsl(215, 98%, 18%) |
| OKLCH | oklch(28.4% 0.102 257.8) |
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 #01275B | 14.55:1 | AAA | Lc -103.8 | Preferred for body text |
| Black text on #01275B | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #01275B text on white | 14.55:1 | AAA | Lc 100.9 | Preferred for body text |
| #01275B text on black | 1.44:1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DDEBFF
oklch(93.6% 0.031 257.2)
-
Step 200
200
#C2DBFF
oklch(88.5% 0.057 257.5)
-
Step 300
300
#9AC3FF
oklch(81% 0.096 257.8)
-
Step 400
400
#60A1FF
oklch(70.8% 0.154 257.7)
-
Step 500
500
#2C85FF
oklch(63.1% 0.2 257.8)
-
Step 600
600
#006CE7
oklch(55.5% 0.204 257.8)
-
Step 700
700
#005BC4
oklch(49.2% 0.18 257.7)
-
Step 800
800
#004AA2
oklch(42.7% 0.156 257.7)
-
Step 900
900
#003D89
oklch(37.7% 0.139 257.9)
-
Step 950
950 (this color)
#01275B
oklch(28.4% 0.102 257.8)
#01275B 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) | #002D5D | 0.018 |
| Deuteranopia (no green cones) | #00255A | 0.006 |
| Tritanopia (no blue cones) | #00343C | 0.078 |
| Achromatopsia (no color) | #292929 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01275B
#01275B
oklch(28.4% 0.102 257.8)
- #3A2500
#3A2500
oklch(28.3% 0.059 76.7)
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 #01275B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.023
- Midnight Blue #191970 ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.056
- Marine Blue #01386A ΔE 0.056
- Oxford Blue #1B263B ΔE 0.062
- Darkblue #030764 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.072
- Dark Royal Blue #02066F ΔE 0.072
Use #01275B 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.