#2B3FA1
Closest named color: Sapphire (#2138AB). oklch(41.5% 0.16 269.3), rgb(43, 63, 161).
Aa
White text reads best on this color (9.01:1).
About this color
#2B3FA1 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.160 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.026 away. White text reads best on it, at 9.01:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.32:1 |
| White text | 9.01:1 |
Values
| HEX | #2B3FA1 |
| RGB | rgb(43, 63, 161) |
| HSL | hsl(230, 58%, 40%) |
| OKLCH | oklch(41.5% 0.16 269.3) |
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 #2B3FA1 | 9.01:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #2B3FA1 | 2.32:1 | Fails | Lc 13.8 | Not readable |
| #2B3FA1 text on white | 9.01:1 | AAA | Lc 90.2 | Preferred for body text |
| #2B3FA1 text on black | 2.32:1 | Fails | Lc -12.1 | 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
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CBD8FC
oklch(88.4% 0.052 269.6)
-
Step 300
300
#A8BEFE
oklch(80.8% 0.094 269.6)
-
Step 400
400
#7B9AFD
oklch(70.6% 0.149 269.2)
-
Step 500
500
#5C7DFB
oklch(63.1% 0.191 269.3)
-
Step 600
600
#4562EA
oklch(55.5% 0.207 269.3)
-
Step 700
700
#3850CC
oklch(49.1% 0.193 269.4)
-
Step 800
800 (this color)
#2B3FA1
oklch(41.5% 0.16 269.3)
-
Step 900
900
#283A83
oklch(37.8% 0.125 269.2)
-
Step 950
950
#17224C
oklch(26.8% 0.079 269.4)
#2B3FA1 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) | #004FA4 | 0.043 |
| Deuteranopia (no green cones) | #00449F | 0.029 |
| Tritanopia (no blue cones) | #00586A | 0.127 |
| Achromatopsia (no color) | #494949 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3FA1
#2B3FA1
oklch(41.5% 0.16 269.3)
- #5E4900
#5E4900
oklch(41.6% 0.085 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 #2B3FA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.026
- Cobalt #1E488F ΔE 0.040
- Blueberry #464196 ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.054
- Blue Blue #2242C7 ΔE 0.062
- Dusk Blue #26538D ΔE 0.066
- Majorelle Blue #3F37C9 ΔE 0.070
- Indigo Blue #3A18B1 ΔE 0.070
Use #2B3FA1 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.