#02537B
Closest named color: Deep Sea Blue (#015482). oklch(42.1% 0.094 239.3), rgb(2, 83, 123).
Aa
White text reads best on this color (8.31:1).
About this color
#02537B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.094 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 8.31:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.52:1 |
| White text | 8.31:1 |
Values
| HEX | #02537B |
| RGB | rgb(2, 83, 123) |
| HSL | hsl(200, 97%, 25%) |
| OKLCH | oklch(42.1% 0.094 239.3) |
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 #02537B | 8.31:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #02537B | 2.52:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #02537B text on white | 8.31:1 | AAA | Lc 88.2 | Fine for body text |
| #02537B 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
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A1C6E1
oklch(80.9% 0.055 240)
-
Step 400
400
#6BA8D2
oklch(70.6% 0.088 239.8)
-
Step 500
500
#3D92C6
oklch(63.1% 0.113 239.1)
-
Step 600
600
#0C7BB3
oklch(55.5% 0.123 239.5)
-
Step 700
700
#006899
oklch(49.2% 0.111 239.3)
-
Step 800
800 (this color)
#02537B
oklch(42.1% 0.094 239.3)
-
Step 900
900
#134664
oklch(37.6% 0.073 239.3)
-
Step 950
950
#0D293B
oklch(26.9% 0.047 240.1)
#02537B 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) | #40547D | 0.050 |
| Deuteranopia (no green cones) | #304A7A | 0.037 |
| 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°).
- #02537B
#02537B
oklch(42.1% 0.094 239.3)
- #723F09
#723F09
oklch(42.2% 0.094 59.8)
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 #02537B, 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 0.042
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.052
- Petrol #005F6A ΔE 0.054
- YInMn Blue #415A77 ΔE 0.057
Use #02537B 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.