#2B337F
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.127 273.7), rgb(43, 51, 127).
Aa
White text reads best on this color (11.15:1).
About this color
#2B337F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.127 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 11.15:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.88:1 |
| White text | 11.15:1 |
Values
| HEX | #2B337F |
| RGB | rgb(43, 51, 127) |
| HSL | hsl(234, 49%, 33%) |
| OKLCH | oklch(36.2% 0.127 273.7) |
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 #2B337F | 11.15:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #2B337F | 1.88:1 | Fails | Lc 8.5 | Not readable |
| #2B337F text on white | 11.15:1 | AAA | Lc 95.4 | Preferred for body text |
| #2B337F text on black | 1.88:1 | 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 900.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FD
oklch(88.4% 0.053 274.8)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6779FD
oklch(63.1% 0.195 273.6)
-
Step 600
600
#525DEC
oklch(55.5% 0.212 273.8)
-
Step 700
700
#434CCE
oklch(49.2% 0.198 273.5)
-
Step 800
800
#373FA6
oklch(42.7% 0.163 273.8)
-
Step 900
900 (this color)
#2B337F
oklch(36.2% 0.127 273.7)
-
Step 950
950
#1B214D
oklch(27% 0.081 273.9)
#2B337F 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) | #003F82 | 0.042 |
| Deuteranopia (no green cones) | #00387D | 0.037 |
| Tritanopia (no blue cones) | #004553 | 0.107 |
| Achromatopsia (no color) | #3B3B3B | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B337F
#2B337F
oklch(36.2% 0.127 273.7)
- #4B3C00
#4B3C00
oklch(36.2% 0.074 93)
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 #2B337F, closest first.
No curated palette has a color within ΔE 0.04 of #2B337F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Marine Blue #01386A ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Blueberry #464196 ΔE 0.069
- Marine #042E60 ΔE 0.071
- Prussian Blue #1D3557 ΔE 0.074
- Sapphire #2138AB ΔE 0.074
Use #2B337F 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.