#2440A3
Closest named color: Sapphire (#2138AB). oklch(41.6% 0.163 266.8), rgb(36, 64, 163).
Aa
White text reads best on this color (8.98:1).
About this color
#2440A3 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.163 and its hue 267°. 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 8.98:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.33:1 |
| White text | 8.98:1 |
Values
| HEX | #2440A3 |
| RGB | rgb(36, 64, 163) |
| HSL | hsl(227, 64%, 39%) |
| OKLCH | oklch(41.6% 0.163 266.8) |
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 #2440A3 | 8.98:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #2440A3 | 2.33:1 | Fails | Lc 13.9 | Not readable |
| #2440A3 text on white | 8.98:1 | AAA | Lc 90.0 | Preferred for body text |
| #2440A3 text on black | 2.33:1 | Fails | Lc -12.2 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#547EFE
oklch(63.1% 0.196 267)
-
Step 600
600
#3B63ED
oklch(55.5% 0.213 266.8)
-
Step 700
700
#2F51CE
oklch(49.1% 0.197 266.9)
-
Step 800
800 (this color)
#2440A3
oklch(41.6% 0.163 266.8)
-
Step 900
900
#233A84
oklch(37.6% 0.128 267)
-
Step 950
950
#14234D
oklch(27% 0.08 266.3)
#2440A3 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) | #004FA6 | 0.039 |
| Deuteranopia (no green cones) | #0043A1 | 0.021 |
| Tritanopia (no blue cones) | #00596B | 0.128 |
| Achromatopsia (no color) | #494949 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2440A3
#2440A3
oklch(41.6% 0.163 266.8)
- #604800
#604800
oklch(41.6% 0.085 86.7)
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 #2440A3, closest first.
No curated palette has a color within ΔE 0.04 of #2440A3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.023
- Cobalt #1E488F ΔE 0.040
- Blueberry #464196 ΔE 0.049
- Blue Blue #2242C7 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.061
- Dusk Blue #26538D ΔE 0.066
- Majorelle Blue #3F37C9 ΔE 0.070
- Light Navy #155084 ΔE 0.071
Use #2440A3 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.