#004B91
Closest named color: Cobalt (#1E488F). oklch(41.6% 0.132 253.9), rgb(0, 75, 145).
Aa
White text reads best on this color (8.69:1).
About this color
#004B91 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.132 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 8.69:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.41:1 |
| White text | 8.69:1 |
Values
| HEX | #004B91 |
| RGB | rgb(0, 75, 145) |
| HSL | hsl(209, 100%, 28%) |
| OKLCH | oklch(41.6% 0.132 253.9) |
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 #004B91 | 8.69:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #004B91 | 2.41:1 | Fails | Lc 14.9 | Not readable |
| #004B91 text on white | 8.69:1 | AAA | Lc 89.1 | Fine for body text |
| #004B91 text on black | 2.41:1 | Fails | Lc -13.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9EC4F2
oklch(80.9% 0.077 253.5)
-
Step 400
400
#68A4EC
oklch(70.8% 0.123 253.8)
-
Step 500
500
#3A8BE6
oklch(63.2% 0.158 253.7)
-
Step 600
600
#0C72D4
oklch(55.5% 0.172 254.1)
-
Step 700
700
#0060B6
oklch(49.2% 0.156 253.8)
-
Step 800
800 (this color)
#004B91
oklch(41.6% 0.132 253.9)
-
Step 900
900
#124276
oklch(37.7% 0.102 253.7)
-
Step 950
950
#0C2745
oklch(27% 0.065 253.3)
#004B91 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) | #225294 | 0.030 |
| Deuteranopia (no green cones) | #004690 | 0.014 |
| Tritanopia (no blue cones) | #005C67 | 0.097 |
| Achromatopsia (no color) | #4B4B4B | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004B91
#004B91
oklch(41.6% 0.132 253.9)
- #684300
#684300
oklch(41.5% 0.088 73.6)
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 #004B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Light Navy #155084 ΔE 0.030
- Dusk Blue #26538D ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.060
- Sapphire #2138AB ΔE 0.065
- Blueberry #464196 ΔE 0.065
Use #004B91 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.