#2C4399
Closest named color: Cobalt (#1E488F). oklch(41.7% 0.143 268.2), rgb(44, 67, 153).
Aa
White text reads best on this color (8.86:1).
About this color
#2C4399 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.143 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 8.86:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.36:1 |
| White text | 8.86:1 |
Values
| HEX | #2C4399 |
| RGB | rgb(44, 67, 153) |
| HSL | hsl(227, 55%, 39%) |
| OKLCH | oklch(41.7% 0.143 268.2) |
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 #2C4399 | 8.86:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #2C4399 | 2.36:1 | Fails | Lc 14.1 | Not readable |
| #2C4399 text on white | 8.86:1 | AAA | Lc 89.9 | Fine for body text |
| #2C4399 text on black | 2.36:1 | Fails | Lc -12.4 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF8
oklch(80.9% 0.084 268.8)
-
Step 400
400
#7D9CF4
oklch(70.7% 0.134 268.2)
-
Step 500
500
#5E80F0
oklch(63% 0.172 268.4)
-
Step 600
600
#4667DE
oklch(55.6% 0.185 268.1)
-
Step 700
700
#3855C1
oklch(49.2% 0.172 268.1)
-
Step 800
800 (this color)
#2C4399
oklch(41.7% 0.143 268.2)
-
Step 900
900
#293C7C
oklch(37.8% 0.111 268.3)
-
Step 950
950
#182449
oklch(27.2% 0.071 268)
#2C4399 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) | #004F9C | 0.037 |
| Deuteranopia (no green cones) | #004597 | 0.029 |
| Tritanopia (no blue cones) | #005867 | 0.116 |
| Achromatopsia (no color) | #4A4A4A | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2C4399
#2C4399
oklch(41.7% 0.143 268.2)
- #5F4900
#5F4900
oklch(41.7% 0.085 88.8)
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 #2C4399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Blueberry #464196 ΔE 0.035
- Sapphire #2138AB ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.045
- Dusk Blue #26538D ΔE 0.050
- Light Navy #155084 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.068
Use #2C4399 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.