#2F40A4
Closest named color: Sapphire (#2138AB). oklch(42.2% 0.162 270.5), rgb(47, 64, 164).
Aa
White text reads best on this color (8.78:1).
About this color
#2F40A4 is a dark, vivid blue. In OKLCH its lightness is 42%, 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 0.028 away. White text reads best on it, at 8.78:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.39:1 |
| White text | 8.78:1 |
Values
| HEX | #2F40A4 |
| RGB | rgb(47, 64, 164) |
| HSL | hsl(231, 55%, 41%) |
| OKLCH | oklch(42.2% 0.162 270.5) |
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 #2F40A4 | 8.78:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #2F40A4 | 2.39:1 | Fails | Lc 14.4 | Not readable |
| #2F40A4 text on white | 8.78:1 | AAA | Lc 89.6 | Fine for body text |
| #2F40A4 text on black | 2.39:1 | Fails | Lc -12.7 | 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 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
#A9BEFE
oklch(80.9% 0.094 270.2)
-
Step 400
400
#7D99FE
oklch(70.6% 0.151 270.5)
-
Step 500
500
#5F7CFC
oklch(63.1% 0.192 270.4)
-
Step 600
600
#4961EC
oklch(55.7% 0.21 270.5)
-
Step 700
700
#3B4FCD
oklch(49.2% 0.195 270.5)
-
Step 800
800 (this color)
#2F40A4
oklch(42.2% 0.162 270.5)
-
Step 900
900
#2A3983
oklch(37.7% 0.125 270.6)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#2F40A4 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) | #0050A7 | 0.045 |
| Deuteranopia (no green cones) | #0045A2 | 0.032 |
| Tritanopia (no blue cones) | #00596B | 0.130 |
| Achromatopsia (no color) | #4B4B4B | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F40A4
#2F40A4
oklch(42.2% 0.162 270.5)
- #604B00
#604B00
oklch(42.3% 0.086 90.2)
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 #2F40A4, closest first.
No curated palette has a color within ΔE 0.04 of #2F40A4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.028
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.054
- Blue Blue #2242C7 ΔE 0.057
- Majorelle Blue #3F37C9 ΔE 0.064
- Dusk Blue #26538D ΔE 0.066
- Indigo Blue #3A18B1 ΔE 0.070
Use #2F40A4 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.