#00577B
Closest named color: Deep Sea Blue (#015482). oklch(43.1% 0.092 235.2), rgb(0, 87, 123).
Aa
White text reads best on this color (7.92:1).
About this color
#00577B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.092 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.017 away. White text reads best on it, at 7.92:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.64:1 |
| White text | 7.92:1 |
Values
| HEX | #00577B |
| RGB | rgb(0, 87, 123) |
| HSL | hsl(198, 100%, 24%) |
| OKLCH | oklch(43.1% 0.092 235.2) |
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 #00577B | 7.92:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #00577B | 2.64:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #00577B text on white | 7.92:1 | AAA | Lc 86.9 | Fine for body text |
| #00577B text on black | 2.64:1 | Fails | Lc -15.2 | Dividers and decoration only |
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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#A0C7DF
oklch(81% 0.054 235.3)
-
Step 400
400
#69A9CF
oklch(70.6% 0.086 235.9)
-
Step 500
500
#3993C2
oklch(63% 0.11 235.3)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800 (this color)
#00577B
oklch(43.1% 0.092 235.2)
-
Step 900
900
#104762
oklch(37.7% 0.072 235.2)
-
Step 950
950
#0C2A39
oklch(27% 0.045 233.7)
#00577B 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) | #45577D | 0.054 |
| Deuteranopia (no green cones) | #364D7A | 0.043 |
| Tritanopia (no blue cones) | #006063 | 0.056 |
| Achromatopsia (no color) | #515151 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00577B
#00577B
oklch(43.1% 0.092 235.2)
- #764116
#764116
oklch(43.2% 0.092 55.5)
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 #00577B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.017
- Light Navy #155084 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.037
- Dusk Blue #26538D ΔE 0.041
- Petrol #005F6A ΔE 0.044
- YInMn Blue #415A77 ΔE 0.050
- Deep Teal #00555A ΔE 0.056
- Peacock Blue #016795 ΔE 0.059
Use #00577B 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.