#01577C
Closest named color: Deep Sea Blue (#015482). oklch(43.2% 0.093 236), rgb(1, 87, 124).
Aa
White text reads best on this color (7.90:1).
About this color
#01577C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.093 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.015 away. White text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #01577C |
| RGB | rgb(1, 87, 124) |
| HSL | hsl(198, 98%, 25%) |
| OKLCH | oklch(43.2% 0.093 236) |
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 #01577C | 7.90:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #01577C | 2.65:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #01577C text on white | 7.90:1 | AAA | Lc 86.9 | Fine for body text |
| #01577C text on black | 2.65:1 | 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
#C7DDEB
oklch(88.6% 0.03 235.7)
-
Step 300
300
#A0C7DF
oklch(81% 0.054 235.3)
-
Step 400
400
#69A9D0
oklch(70.7% 0.087 236.6)
-
Step 500
500
#3A93C3
oklch(63.1% 0.11 236)
-
Step 600
600
#007CAF
oklch(55.5% 0.12 236.1)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800 (this color)
#01577C
oklch(43.2% 0.093 236)
-
Step 900
900
#104763
oklch(37.8% 0.073 236.2)
-
Step 950
950
#0C2A3A
oklch(27.1% 0.046 235.5)
#01577C 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) | #45577E | 0.054 |
| Deuteranopia (no green cones) | #354D7B | 0.042 |
| Tritanopia (no blue cones) | #006164 | 0.058 |
| Achromatopsia (no color) | #515151 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01577C
#01577C
oklch(43.2% 0.093 236)
- #764114
#764114
oklch(43.2% 0.093 56.3)
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 #01577C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.015
- Light Navy #155084 ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.036
- Dusk Blue #26538D ΔE 0.039
- Petrol #005F6A ΔE 0.045
- YInMn Blue #415A77 ΔE 0.050
- Deep Teal #00555A ΔE 0.057
- Peacock Blue #016795 ΔE 0.058
Use #01577C 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.