#004F73
Closest named color: Deep Sea Blue (#015482). oklch(40.5% 0.089 237.4), rgb(0, 79, 115).
Aa
White text reads best on this color (8.87:1).
About this color
#004F73 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.089 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.027 away. White text reads best on it, at 8.87:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #004F73 |
| RGB | rgb(0, 79, 115) |
| HSL | hsl(199, 100%, 23%) |
| OKLCH | oklch(40.5% 0.089 237.4) |
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 #004F73 | 8.87:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #004F73 | 2.36:1 | Fails | Lc 14.2 | Not readable |
| #004F73 text on white | 8.87:1 | AAA | Lc 89.8 | Fine for body text |
| #004F73 text on black | 2.36:1 | Fails | Lc -12.5 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEA
oklch(88.4% 0.029 238.3)
-
Step 300
300
#A2C6DF
oklch(80.9% 0.052 238.6)
-
Step 400
400
#6DA9CE
oklch(70.8% 0.083 236.7)
-
Step 500
500
#4192C2
oklch(63% 0.107 237.9)
-
Step 600
600
#167CAE
oklch(55.6% 0.115 237.1)
-
Step 700
700
#016896
oklch(49.1% 0.108 237.7)
-
Step 800
800 (this color)
#004F73
oklch(40.5% 0.089 237.4)
-
Step 900
900
#154662
oklch(37.6% 0.07 238.1)
-
Step 950
950
#0F2939
oklch(26.9% 0.044 238.4)
#004F73 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) | #3D4F75 | 0.049 |
| Deuteranopia (no green cones) | #2F4672 | 0.038 |
| Tritanopia (no blue cones) | #00585C | 0.055 |
| Achromatopsia (no color) | #4A4A4A | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004F73
#004F73
oklch(40.5% 0.089 237.4)
- #6C3B0D
#6C3B0D
oklch(40.6% 0.089 57.9)
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 #004F73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.027
- Light Navy #155084 ΔE 0.031
- Twilight Blue #0A437A ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.046
- Dusk Blue #26538D ΔE 0.051
- Deep Teal #00555A ΔE 0.052
- Charcoal #264653 ΔE 0.056
- Cobalt #1E488F ΔE 0.057
Use #004F73 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.