#1B4570
Closest named color: Twilight Blue (#0A437A). oklch(38.4% 0.087 251.6), rgb(27, 69, 112).
Aa
White text reads best on this color (9.85:1).
About this color
#1B4570 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.087 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.022 away. White text reads best on it, at 9.85:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.13:1 |
| White text | 9.85:1 |
Values
| HEX | #1B4570 |
| RGB | rgb(27, 69, 112) |
| HSL | hsl(210, 61%, 27%) |
| OKLCH | oklch(38.4% 0.087 251.6) |
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 #1B4570 | 9.85:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #1B4570 | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #1B4570 text on white | 9.85:1 | AAA | Lc 92.6 | Preferred for body text |
| #1B4570 text on black | 2.13:1 | Fails | Lc -9.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4EA
oklch(80.9% 0.065 251.5)
-
Step 400
400
#6FA5E0
oklch(70.8% 0.104 251.5)
-
Step 500
500
#458DD7
oklch(63.1% 0.133 251.3)
-
Step 600
600
#2275C5
oklch(55.6% 0.146 251.8)
-
Step 700
700
#1362AA
oklch(49.1% 0.135 251.6)
-
Step 800
800
#14508A
oklch(42.6% 0.113 251.9)
-
Step 900
900 (this color)
#1B4570
oklch(38.4% 0.087 251.6)
-
Step 950
950
#102840
oklch(27.1% 0.054 250.5)
#1B4570 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) | #314872 | 0.027 |
| Deuteranopia (no green cones) | #25406F | 0.016 |
| Tritanopia (no blue cones) | #004F55 | 0.065 |
| Achromatopsia (no color) | #434343 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4570
#1B4570
oklch(38.4% 0.087 251.6)
- #5E3B00
#5E3B00
oklch(38.4% 0.082 72.1)
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 #1B4570, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Dark Grey Blue #29465B ΔE 0.039
- Light Navy #155084 ΔE 0.043
- Marine Blue #01386A ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.049
- Charcoal #264653 ΔE 0.052
- Cobalt #1E488F ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.060
Use #1B4570 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.