#2B437C
Closest named color: Twilight Blue (#0A437A). oklch(39.5% 0.101 265), rgb(43, 67, 124).
Aa
White text reads best on this color (9.56:1).
About this color
#2B437C is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.101 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 9.56:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.19:1 |
| White text | 9.56:1 |
Values
| HEX | #2B437C |
| RGB | rgb(43, 67, 124) |
| HSL | hsl(222, 49%, 33%) |
| OKLCH | oklch(39.5% 0.101 265) |
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 #2B437C | 9.56:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #2B437C | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #2B437C text on white | 9.56:1 | AAA | Lc 91.9 | Preferred for body text |
| #2B437C text on black | 2.19:1 | Fails | Lc -10.5 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#A9C0F2
oklch(80.8% 0.075 265.5)
-
Step 400
400
#7B9EEC
oklch(70.6% 0.121 265.1)
-
Step 500
500
#5B84E6
oklch(63% 0.154 265.2)
-
Step 600
600
#416CD4
oklch(55.6% 0.167 264.6)
-
Step 700
700
#3459B8
oklch(49.1% 0.156 265.1)
-
Step 800
800
#2B4995
oklch(42.6% 0.13 265.1)
-
Step 900
900 (this color)
#2B437C
oklch(39.5% 0.101 265)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#2B437C 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) | #28497E | 0.017 |
| Deuteranopia (no green cones) | #1B427B | 0.017 |
| Tritanopia (no blue cones) | #005059 | 0.086 |
| Achromatopsia (no color) | #454545 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B437C
#2B437C
oklch(39.5% 0.101 265)
- #5A4200
#5A4200
oklch(39.5% 0.081 85)
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 #2B437C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Cobalt #1E488F ΔE 0.034
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.052
- Blueberry #464196 ΔE 0.059
- Marine Blue #01386A ΔE 0.060
Use #2B437C 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.