#2A3A9C
Closest named color: Sapphire (#2138AB). oklch(40.1% 0.159 270.3), rgb(42, 58, 156).
Aa
White text reads best on this color (9.61:1).
About this color
#2A3A9C is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.159 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 9.61:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.18:1 |
| White text | 9.61:1 |
Values
| HEX | #2A3A9C |
| RGB | rgb(42, 58, 156) |
| HSL | hsl(232, 58%, 39%) |
| OKLCH | oklch(40.1% 0.159 270.3) |
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 #2A3A9C | 9.61:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #2A3A9C | 2.18:1 | Fails | Lc 12.2 | Not readable |
| #2A3A9C text on white | 9.61:1 | AAA | Lc 91.7 | Preferred for body text |
| #2A3A9C text on black | 2.18:1 | Fails | Lc -10.7 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
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
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#4359FF
oklch(55.7% 0.244 270.2)
-
Step 700
700
#3540E9
oklch(49.1% 0.247 270.3)
-
Step 800
800
#2B37BC
oklch(42.7% 0.204 270.3)
-
Step 900
900 (this color)
#2A3A9C
oklch(40.1% 0.159 270.3)
-
Step 950
950
#151F57
oklch(27% 0.102 270.4)
#2A3A9C 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) | #004A9F | 0.043 |
| Deuteranopia (no green cones) | #00409A | 0.030 |
| Tritanopia (no blue cones) | #005365 | 0.127 |
| Achromatopsia (no color) | #454545 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3A9C
#2A3A9C
oklch(40.1% 0.159 270.3)
- #594500
#594500
oklch(40% 0.082 89.8)
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 #2A3A9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Cobalt #1E488F ΔE 0.043
- Blueberry #464196 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.068
- Blue Blue #2242C7 ΔE 0.072
- Dusk Blue #26538D ΔE 0.073
Use #2A3A9C 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.