#2A3B9F
Closest named color: Sapphire (#2138AB). oklch(40.5% 0.162 270), rgb(42, 59, 159).
Aa
White text reads best on this color (9.43:1).
About this color
#2A3B9F 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 0.023 away. White text reads best on it, at 9.43:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.22:1 |
| White text | 9.43:1 |
Values
| HEX | #2A3B9F |
| RGB | rgb(42, 59, 159) |
| HSL | hsl(231, 58%, 39%) |
| OKLCH | oklch(40.5% 0.162 270) |
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 #2A3B9F | 9.43:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #2A3B9F | 2.22:1 | Fails | Lc 12.7 | Not readable |
| #2A3B9F text on white | 9.43:1 | AAA | Lc 91.3 | Preferred for body text |
| #2A3B9F 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
#E2E9FD
oklch(93.5% 0.028 270.4)
-
Step 200
200
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5E7CFD
oklch(63.1% 0.194 270.1)
-
Step 600
600
#4761EC
oklch(55.6% 0.21 270)
-
Step 700
700
#394FCD
oklch(49.1% 0.195 269.9)
-
Step 800
800 (this color)
#2A3B9F
oklch(40.5% 0.162 270)
-
Step 900
900
#293984
oklch(37.8% 0.127 270.1)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#2A3B9F 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 | 0.029 |
| 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°).
- #2A3B9F
#2A3B9F
oklch(40.5% 0.162 270)
- #5B4600
#5B4600
oklch(40.5% 0.083 89.1)
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 #2A3B9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.023
- Cobalt #1E488F ΔE 0.044
- Blueberry #464196 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.055
- Indigo Blue #3A18B1 ΔE 0.064
- Blue Blue #2242C7 ΔE 0.067
- Twilight Blue #0A437A ΔE 0.071
- Majorelle Blue #3F37C9 ΔE 0.073
Use #2A3B9F 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.