#2B3B9F
Closest named color: Sapphire (#2138AB). oklch(40.6% 0.162 270.4), rgb(43, 59, 159).
Aa
White text reads best on this color (9.42:1).
About this color
#2B3B9F is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.162 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.024 away. White text reads best on it, at 9.42:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #2B3B9F |
| RGB | rgb(43, 59, 159) |
| HSL | hsl(232, 57%, 40%) |
| OKLCH | oklch(40.6% 0.162 270.4) |
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 #2B3B9F | 9.42:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #2B3B9F | 2.22:1 | Fails | Lc 12.7 | Not readable |
| #2B3B9F text on white | 9.42:1 | AAA | Lc 91.2 | Preferred for body text |
| #2B3B9F text on black | 2.22:1 | Fails | Lc -11.1 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5F7CFD
oklch(63.2% 0.194 270.4)
-
Step 600
600
#4861EC
oklch(55.7% 0.21 270.3)
-
Step 700
700
#3A4FCD
oklch(49.1% 0.195 270.2)
-
Step 800
800 (this color)
#2B3B9F
oklch(40.6% 0.162 270.4)
-
Step 900
900
#293983
oklch(37.7% 0.126 270.1)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#2B3B9F 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) | #004CA2 | 0.045 |
| Deuteranopia (no green cones) | #00419D | 0.030 |
| Tritanopia (no blue cones) | #005567 | 0.130 |
| Achromatopsia (no color) | #464646 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3B9F
#2B3B9F
oklch(40.6% 0.162 270.4)
- #5A4700
#5A4700
oklch(40.6% 0.083 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 #2B3B9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.024
- Cobalt #1E488F ΔE 0.044
- Blueberry #464196 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.063
- Blue Blue #2242C7 ΔE 0.067
- Twilight Blue #0A437A ΔE 0.072
- Majorelle Blue #3F37C9 ΔE 0.072
Use #2B3B9F 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.