#1B275F
Closest named color: Marine (#042E60). oklch(29.9% 0.101 270.1), rgb(27, 39, 95).
Aa
White text reads best on this color (13.98:1).
About this color
#1B275F is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.101 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.026 away. White text reads best on it, at 13.98:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.50:1 |
| White text | 13.98:1 |
Values
| HEX | #1B275F |
| RGB | rgb(27, 39, 95) |
| HSL | hsl(229, 56%, 24%) |
| OKLCH | oklch(29.9% 0.101 270.1) |
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 #1B275F | 13.98:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #1B275F | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #1B275F text on white | 13.98:1 | AAA | Lc 100.4 | Preferred for body text |
| #1B275F text on black | 1.50:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5D7BFF
oklch(63% 0.198 270.2)
-
Step 600
600
#4359FF
oklch(55.7% 0.244 270.2)
-
Step 700
700
#3441E9
oklch(49.2% 0.246 270)
-
Step 800
800
#2A37BC
oklch(42.6% 0.205 270)
-
Step 900
900
#243394
oklch(37.7% 0.159 269.9)
-
Step 950
950 (this color)
#1B275F
oklch(29.9% 0.101 270.1)
#1B275F 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) | #002F61 | 0.029 |
| Deuteranopia (no green cones) | #00295E | 0.024 |
| Tritanopia (no blue cones) | #00343E | 0.083 |
| Achromatopsia (no color) | #2C2C2C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B275F
#1B275F
oklch(29.9% 0.101 270.1)
- #392C00
#392C00
oklch(29.9% 0.061 91.2)
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 #1B275F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.026
- Midnight Blue #191970 ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.047
- Marine Blue #01386A ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.064
- Oxford Blue #1B263B ΔE 0.066
- Dark Indigo #1F0954 ΔE 0.071
- Gunmetal #293241 ΔE 0.073
Use #1B275F 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.