#2B3B9C
Closest named color: Sapphire (#2138AB). oklch(40.3% 0.158 270.4), rgb(43, 59, 156).
Aa
White text reads best on this color (9.50:1).
About this color
#2B3B9C is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.158 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.028 away. White text reads best on it, at 9.50:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.20:1 |
| White text | 9.50:1 |
Values
| HEX | #2B3B9C |
| RGB | rgb(43, 59, 156) |
| HSL | hsl(232, 57%, 39%) |
| OKLCH | oklch(40.3% 0.158 270.4) |
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 #2B3B9C | 9.50:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #2B3B9C | 2.20:1 | Fails | Lc 12.5 | Not readable |
| #2B3B9C text on white | 9.50:1 | AAA | Lc 91.5 | Preferred for body text |
| #2B3B9C text on black | 2.20:1 | Fails | Lc -10.9 | 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
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#AABEFD
oklch(80.9% 0.092 270.6)
-
Step 400
400
#7E9AFC
oklch(70.8% 0.147 270.3)
-
Step 500
500
#607DFA
oklch(63.2% 0.188 270.4)
-
Step 600
600
#4962E9
oklch(55.7% 0.205 270.3)
-
Step 700
700
#3B50CB
oklch(49.2% 0.191 270.3)
-
Step 800
800 (this color)
#2B3B9C
oklch(40.3% 0.158 270.4)
-
Step 900
900
#2A3982
oklch(37.6% 0.124 270.6)
-
Step 950
950
#18224C
oklch(26.9% 0.079 270.3)
#2B3B9C 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) | #004B9F | 0.044 |
| Deuteranopia (no green cones) | #00409A | 0.030 |
| Tritanopia (no blue cones) | #005465 | 0.128 |
| Achromatopsia (no color) | #464646 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3B9C
#2B3B9C
oklch(40.3% 0.158 270.4)
- #5A4600
#5A4600
oklch(40.4% 0.083 90)
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 #2B3B9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.028
- Cobalt #1E488F ΔE 0.041
- Blueberry #464196 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.068
- Dusk Blue #26538D ΔE 0.071
- Blue Blue #2242C7 ΔE 0.071
Use #2B3B9C 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.