#1B497B
Closest named color: Twilight Blue (#0A437A). oklch(40.1% 0.098 253.1), rgb(27, 73, 123).
Aa
White text reads best on this color (9.18:1).
About this color
#1B497B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 9.18:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #1B497B |
| RGB | rgb(27, 73, 123) |
| HSL | hsl(211, 64%, 29%) |
| OKLCH | oklch(40.1% 0.098 253.1) |
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 #1B497B | 9.18:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #1B497B | 2.28:1 | Fails | Lc 13.1 | Not readable |
| #1B497B text on white | 9.18:1 | AAA | Lc 90.9 | Preferred for body text |
| #1B497B text on black | 2.28:1 | Fails | Lc -11.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#9FC4F0
oklch(80.9% 0.074 253.1)
-
Step 400
400
#69A4E8
oklch(70.7% 0.118 252.9)
-
Step 500
500
#3D8BE1
oklch(63% 0.151 253.2)
-
Step 600
600
#1373CF
oklch(55.5% 0.164 253.2)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#094F91
oklch(42.7% 0.126 253)
-
Step 900
900 (this color)
#1B497B
oklch(40.1% 0.098 253.1)
-
Step 950
950
#0D2744
oklch(27% 0.063 253.3)
#1B497B 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) | #314D7D | 0.027 |
| Deuteranopia (no green cones) | #22447A | 0.015 |
| Tritanopia (no blue cones) | #00555C | 0.074 |
| Achromatopsia (no color) | #484848 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B497B
#1B497B
oklch(40.1% 0.098 253.1)
- #633F00
#633F00
oklch(40% 0.085 72.9)
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 #1B497B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Light Navy #155084 ΔE 0.023
- Deep Sea Blue #015482 ΔE 0.033
- Cobalt #1E488F ΔE 0.034
- Dusk Blue #26538D ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.058
- Marine Blue #01386A ΔE 0.062
Use #1B497B 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.