#004E91
Closest named color: Cobalt (#1E488F). oklch(42.3% 0.128 252.5), rgb(0, 78, 145).
Aa
White text reads best on this color (8.40:1).
About this color
#004E91 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.128 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.020 away. White text reads best on it, at 8.40:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.49:1 |
| White text | 8.40:1 |
Values
| HEX | #004E91 |
| RGB | rgb(0, 78, 145) |
| HSL | hsl(208, 100%, 28%) |
| OKLCH | oklch(42.3% 0.128 252.5) |
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 #004E91 | 8.40:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #004E91 | 2.49:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #004E91 text on white | 8.40:1 | AAA | Lc 88.3 | Fine for body text |
| #004E91 text on black | 2.49:1 | Fails | Lc -13.9 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF5
oklch(88.6% 0.042 251.7)
-
Step 300
300
#9EC4F0
oklch(80.8% 0.075 252.4)
-
Step 400
400
#67A4E9
oklch(70.6% 0.12 252.6)
-
Step 500
500
#398CE3
oklch(63.2% 0.153 252.4)
-
Step 600
600
#0574D1
oklch(55.7% 0.167 252.4)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800 (this color)
#004E91
oklch(42.3% 0.128 252.5)
-
Step 900
900
#104275
oklch(37.6% 0.101 252.8)
-
Step 950
950
#0C2744
oklch(26.9% 0.063 252.6)
#004E91 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) | #295494 | 0.032 |
| Deuteranopia (no green cones) | #034890 | 0.017 |
| Tritanopia (no blue cones) | #005E68 | 0.094 |
| Achromatopsia (no color) | #4D4D4D | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004E91
#004E91
oklch(42.3% 0.128 252.5)
- #6B4400
#6B4400
oklch(42.1% 0.09 72.4)
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 #004E91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.020
- Light Navy #155084 ΔE 0.025
- Dusk Blue #26538D ΔE 0.028
- Deep Sea Blue #015482 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.061
- Blueberry #464196 ΔE 0.067
Use #004E91 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.