#02497A
Closest named color: Twilight Blue (#0A437A). oklch(39.5% 0.103 247.3), rgb(2, 73, 122).
Aa
White text reads best on this color (9.38:1).
About this color
#02497A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.103 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 9.38:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.23:1 |
| White text | 9.38:1 |
Values
| HEX | #02497A |
| RGB | rgb(2, 73, 122) |
| HSL | hsl(205, 97%, 24%) |
| OKLCH | oklch(39.5% 0.103 247.3) |
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 #02497A | 9.38:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #02497A | 2.23:1 | Fails | Lc 12.8 | Not readable |
| #02497A text on white | 9.38:1 | AAA | Lc 91.1 | Preferred for body text |
| #02497A text on black | 2.23:1 | Fails | Lc -11.2 | 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 900.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DCF5
oklch(88.4% 0.044 248.3)
-
Step 300
300
#99C6F0
oklch(80.9% 0.076 247)
-
Step 400
400
#5BA7E9
oklch(70.7% 0.123 246.8)
-
Step 500
500
#1B8FE3
oklch(63.2% 0.158 247.1)
-
Step 600
600
#0078C4
oklch(55.7% 0.147 247.1)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900 (this color)
#02497A
oklch(39.5% 0.103 247.3)
-
Step 950
950
#052844
oklch(26.9% 0.065 247.5)
#02497A 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) | #314C7C | 0.037 |
| Deuteranopia (no green cones) | #1E4279 | 0.023 |
| Tritanopia (no blue cones) | #00555B | 0.074 |
| Achromatopsia (no color) | #464646 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #02497A
#02497A
oklch(39.5% 0.103 247.3)
- #653B00
#653B00
oklch(39.4% 0.088 66.4)
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 #02497A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Light Navy #155084 ΔE 0.028
- Deep Sea Blue #015482 ΔE 0.034
- Cobalt #1E488F ΔE 0.040
- Dusk Blue #26538D ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.055
- Marine Blue #01386A ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.066
Use #02497A 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.