#2B3870
Closest named color: Marine Blue (#01386A). oklch(36.1% 0.098 271), rgb(43, 56, 112).
Aa
White text reads best on this color (11.03:1).
About this color
#2B3870 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.098 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.039 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #2B3870 |
| RGB | rgb(43, 56, 112) |
| HSL | hsl(229, 45%, 30%) |
| OKLCH | oklch(36.1% 0.098 271) |
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 #2B3870 | 11.03:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #2B3870 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #2B3870 text on white | 11.03:1 | AAA | Lc 95.3 | Preferred for body text |
| #2B3870 text on black | 1.90:1 | Fails | Lc -7.3 | 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 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AFBFF1
oklch(81% 0.073 270.9)
-
Step 400
400
#869CEA
oklch(70.8% 0.117 271.2)
-
Step 500
500
#6981E3
oklch(63.1% 0.15 271.2)
-
Step 600
600
#5268D1
oklch(55.5% 0.163 271.3)
-
Step 700
700
#4356B5
oklch(49.1% 0.151 271.3)
-
Step 800
800
#374793
oklch(42.7% 0.126 271.2)
-
Step 900
900 (this color)
#2B3870
oklch(36.1% 0.098 271)
-
Step 950
950
#1B2444
oklch(27% 0.061 270.1)
#2B3870 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) | #1D3F72 | 0.023 |
| Deuteranopia (no green cones) | #12396F | 0.026 |
| Tritanopia (no blue cones) | #00454E | 0.087 |
| Achromatopsia (no color) | #3C3C3C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3870
#2B3870
oklch(36.1% 0.098 271)
- #4C3B00
#4C3B00
oklch(36.1% 0.074 90.5)
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 #2B3870, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.039
- Twilight Blue #0A437A ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.049
- Marine #042E60 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.063
- Cobalt #1E488F ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.067
- Dark Blue Grey #1F3B4D ΔE 0.067
Use #2B3870 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.