#00537C
Closest named color: Deep Sea Blue (#015482). oklch(42.1% 0.096 239.7), rgb(0, 83, 124).
Aa
White text reads best on this color (8.30:1).
About this color
#00537C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.096 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.010 away. White text reads best on it, at 8.30:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.52:1 |
| White text | 8.30:1 |
Values
| HEX | #00537C |
| RGB | rgb(0, 83, 124) |
| HSL | hsl(200, 100%, 24%) |
| OKLCH | oklch(42.1% 0.096 239.7) |
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 #00537C | 8.30:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #00537C | 2.52:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #00537C text on white | 8.30:1 | AAA | Lc 88.1 | Fine for body text |
| #00537C 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
#C7DCEC
oklch(88.4% 0.032 240.7)
-
Step 300
300
#A0C6E2
oklch(80.8% 0.057 240.3)
-
Step 400
400
#6AA8D3
oklch(70.6% 0.09 240)
-
Step 500
500
#3C92C7
oklch(63.1% 0.114 239.4)
-
Step 600
600
#087BB4
oklch(55.6% 0.125 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800 (this color)
#00537C
oklch(42.1% 0.096 239.7)
-
Step 900
900
#124665
oklch(37.7% 0.075 239.9)
-
Step 950
950
#0D293B
oklch(26.9% 0.047 240.1)
#00537C 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) | #3F547E | 0.049 |
| Deuteranopia (no green cones) | #2F4A7B | 0.037 |
| Tritanopia (no blue cones) | #005D62 | 0.061 |
| Achromatopsia (no color) | #4E4E4E | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00537C
#00537C
oklch(42.1% 0.096 239.7)
- #733E05
#733E05
oklch(42.1% 0.097 59.2)
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 #00537C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.010
- Light Navy #155084 ΔE 0.020
- Dusk Blue #26538D ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.042
- Twilight Blue #0A437A ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Petrol #005F6A ΔE 0.055
- YInMn Blue #415A77 ΔE 0.058
Use #00537C 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.