#1B2F5B
Closest named color: Marine (#042E60). oklch(31.4% 0.083 263.9), rgb(27, 47, 91).
Aa
White text reads best on this color (13.09:1).
About this color
#1B2F5B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.083 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.022 away. White text reads best on it, at 13.09:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.60:1 |
| White text | 13.09:1 |
Values
| HEX | #1B2F5B |
| RGB | rgb(27, 47, 91) |
| HSL | hsl(221, 54%, 23%) |
| OKLCH | oklch(31.4% 0.083 263.9) |
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 #1B2F5B | 13.09:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #1B2F5B | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #1B2F5B text on white | 13.09:1 | AAA | Lc 99.2 | Preferred for body text |
| #1B2F5B text on black | 1.60:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4980FF
oklch(63% 0.198 264)
-
Step 600
600
#2C65F0
oklch(55.6% 0.218 263.8)
-
Step 700
700
#2052D1
oklch(49% 0.203 263.9)
-
Step 800
800
#1C44A9
oklch(42.6% 0.168 264)
-
Step 900
900
#1C3B86
oklch(37.7% 0.131 264.1)
-
Step 950
950 (this color)
#1B2F5B
oklch(31.4% 0.083 263.9)
#1B2F5B 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) | #1A345D | 0.015 |
| Deuteranopia (no green cones) | #0F2E5A | 0.013 |
| Tritanopia (no blue cones) | #003940 | 0.069 |
| Achromatopsia (no color) | #313131 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2F5B
#1B2F5B
oklch(31.4% 0.083 263.9)
- #412E00
#412E00
oklch(31.5% 0.065 83.7)
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 #1B2F5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.022
- Marine Blue #01386A ΔE 0.036
- Space Cadet #2B2D42 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.052
- Gunmetal #293241 ΔE 0.053
- Midnight Green #073B4C ΔE 0.054
- Oxford Blue #1B263B ΔE 0.061
Use #1B2F5B 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.