#1B2563
Closest named color: Marine (#042E60). oklch(29.8% 0.11 271.2), rgb(27, 37, 99).
Aa
White text reads best on this color (14.08:1).
About this color
#1B2563 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.110 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.030 away. White text reads best on it, at 14.08:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.49:1 |
| White text | 14.08:1 |
Values
| HEX | #1B2563 |
| RGB | rgb(27, 37, 99) |
| HSL | hsl(232, 57%, 25%) |
| OKLCH | oklch(29.8% 0.11 271.2) |
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 #1B2563 | 14.08:1 | AAA | Lc -103.5 | Preferred for body text |
| Black text on #1B2563 | 1.49:1 | Fails | Lc 0.0 | Not readable |
| #1B2563 text on white | 14.08:1 | AAA | Lc 100.4 | Preferred for body text |
| #1B2563 text on black | 1.49:1 | 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
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#607BFF
oklch(63.2% 0.197 271)
-
Step 600
600
#4758FF
oklch(55.7% 0.244 271.2)
-
Step 700
700
#3836F4
oklch(49.1% 0.267 271.2)
-
Step 800
800
#2D30C5
oklch(42.7% 0.222 271.2)
-
Step 900
900
#252F9B
oklch(37.7% 0.173 270.9)
-
Step 950
950 (this color)
#1B2563
oklch(29.8% 0.11 271.2)
#1B2563 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) | #002F65 | 0.032 |
| Deuteranopia (no green cones) | #002862 | 0.025 |
| Tritanopia (no blue cones) | #003440 | 0.088 |
| Achromatopsia (no color) | #2B2B2B | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2563
#1B2563
oklch(29.8% 0.11 271.2)
- #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 #1B2563, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.030
- Midnight Blue #191970 ΔE 0.036
- Marine Blue #01386A ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
- Dark Indigo #1F0954 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.073
- Dark Royal Blue #02066F ΔE 0.073
- Oxford Blue #1B263B ΔE 0.074
Use #1B2563 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.