#1B2B65
Closest named color: Marine (#042E60). oklch(31.3% 0.104 268.2), rgb(27, 43, 101).
Aa
White text reads best on this color (13.29:1).
About this color
#1B2B65 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.104 and its hue 268°. 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 13.29:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.58:1 |
| White text | 13.29:1 |
Values
| HEX | #1B2B65 |
| RGB | rgb(27, 43, 101) |
| HSL | hsl(227, 58%, 25%) |
| OKLCH | oklch(31.3% 0.104 268.2) |
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 #1B2B65 | 13.29:1 | AAA | Lc -102.6 | Preferred for body text |
| Black text on #1B2B65 | 1.58:1 | Fails | Lc 0.0 | Not readable |
| #1B2B65 text on white | 13.29:1 | AAA | Lc 99.4 | Preferred for body text |
| #1B2B65 text on black | 1.58:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789AFF
oklch(70.6% 0.153 268.3)
-
Step 500
500
#577DFF
oklch(63.1% 0.197 268)
-
Step 600
600
#3B5BFF
oklch(55.6% 0.244 268.3)
-
Step 700
700
#2B40EE
oklch(49.2% 0.255 268.1)
-
Step 800
800
#2337C0
oklch(42.7% 0.211 268.2)
-
Step 900
900
#1F3397
oklch(37.8% 0.164 268.2)
-
Step 950
950 (this color)
#1B2B65
oklch(31.3% 0.104 268.2)
#1B2B65 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) | #013367 | 0.027 |
| Deuteranopia (no green cones) | #002C64 | 0.023 |
| Tritanopia (no blue cones) | #003943 | 0.085 |
| Achromatopsia (no color) | #303030 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B2B65
#1B2B65
oklch(31.3% 0.104 268.2)
- #3E2F00
#3E2F00
oklch(31.3% 0.064 89.4)
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 #1B2B65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.023
- Marine Blue #01386A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.042
- Midnight Blue #191970 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.073
- Twilight Blue #0A437A ΔE 0.074
- Midnight Green #073B4C ΔE 0.074
Use #1B2B65 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.