#00537B
Closest named color: Deep Sea Blue (#015482). oklch(42.1% 0.095 239.1), rgb(0, 83, 123).
Aa
White text reads best on this color (8.32:1).
About this color
#00537B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.095 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.012 away. White text reads best on it, at 8.32:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.52:1 |
| White text | 8.32:1 |
Values
| HEX | #00537B |
| RGB | rgb(0, 83, 123) |
| HSL | hsl(200, 100%, 24%) |
| OKLCH | oklch(42.1% 0.095 239.1) |
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 #00537B | 8.32:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #00537B | 2.52:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #00537B text on white | 8.32:1 | AAA | Lc 88.2 | Fine for body text |
| #00537B text on black | 2.52:1 | Fails | Lc -14.0 | 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
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C7DDEC
oklch(88.6% 0.031 237.6)
-
Step 300
300
#A0C6E1
oklch(80.8% 0.056 239.3)
-
Step 400
400
#6AA8D2
oklch(70.6% 0.089 239.4)
-
Step 500
500
#3C92C6
oklch(63.1% 0.113 238.9)
-
Step 600
600
#087BB3
oklch(55.5% 0.124 239.3)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800 (this color)
#00537B
oklch(42.1% 0.095 239.1)
-
Step 900
900
#124664
oklch(37.6% 0.074 239)
-
Step 950
950
#0D293B
oklch(26.9% 0.047 240.1)
#00537B 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) | #3F547D | 0.049 |
| Deuteranopia (no green cones) | #304A7A | 0.038 |
| Tritanopia (no blue cones) | #005D61 | 0.062 |
| Achromatopsia (no color) | #4E4E4E | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00537B
#00537B
oklch(42.1% 0.095 239.1)
- #723E08
#723E08
oklch(42% 0.095 59)
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 #00537B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.012
- Light Navy #155084 ΔE 0.021
- Dusk Blue #26538D ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.052
- Petrol #005F6A ΔE 0.054
- YInMn Blue #415A77 ΔE 0.058
Use #00537B 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.