#01497D
Closest named color: Twilight Blue (#0A437A). oklch(39.7% 0.107 248.5), rgb(1, 73, 125).
Aa
White text reads best on this color (9.33:1).
About this color
#01497D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.107 and its hue 248°. 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 9.33:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.25:1 |
| White text | 9.33:1 |
Values
| HEX | #01497D |
| RGB | rgb(1, 73, 125) |
| HSL | hsl(205, 98%, 25%) |
| OKLCH | oklch(39.7% 0.107 248.5) |
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 #01497D | 9.33:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #01497D | 2.25:1 | Fails | Lc 13.0 | Not readable |
| #01497D text on white | 9.33:1 | AAA | Lc 91.0 | Preferred for body text |
| #01497D text on black | 2.25:1 | Fails | Lc -11.4 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C3DCF6
oklch(88.4% 0.045 249.4)
-
Step 300
300
#98C6F3
oklch(81% 0.08 248.3)
-
Step 400
400
#5AA6ED
oklch(70.7% 0.129 248.7)
-
Step 500
500
#178EE7
oklch(63.2% 0.164 248.3)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900 (this color)
#01497D
oklch(39.7% 0.107 248.5)
-
Step 950
950
#042846
oklch(27% 0.068 248.6)
#01497D 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) | #2F4C7F | 0.035 |
| Deuteranopia (no green cones) | #1B427C | 0.022 |
| Tritanopia (no blue cones) | #00565D | 0.077 |
| Achromatopsia (no color) | #474747 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01497D
#01497D
oklch(39.7% 0.107 248.5)
- #643C00
#643C00
oklch(39.5% 0.086 68.4)
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 #01497D, 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 0.026
- Deep Sea Blue #015482 ΔE 0.034
- Cobalt #1E488F ΔE 0.036
- Dusk Blue #26538D ΔE 0.047
- Marine Blue #01386A ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.065
Use #01497D 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.