#1B73AA
Closest named color: Nice Blue (#107AB0). oklch(53.3% 0.117 242.3), rgb(27, 115, 170).
Aa
White text reads best on this color (5.14:1).
About this color
#1B73AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.117 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.020 away. White text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.07:1 |
| White text | 5.14:1 |
Values
| HEX | #1B73AA |
| RGB | rgb(27, 115, 170) |
| HSL | hsl(203, 73%, 39%) |
| OKLCH | oklch(53.3% 0.117 242.3) |
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 #1B73AA | 5.14:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #1B73AA | 4.07:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #1B73AA text on white | 5.14:1 | AA | Lc 75.0 | Fine for body text |
| #1B73AA text on black | 4.07:1 | AA large text | Lc -26.7 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400
#71A7D1
oklch(70.7% 0.084 242.8)
-
Step 500
500
#4891C5
oklch(63.2% 0.107 242.1)
-
Step 600
600 (this color)
#1B73AA
oklch(53.3% 0.117 242.3)
-
Step 700
700
#156699
oklch(49% 0.109 242.9)
-
Step 800
800
#16547C
oklch(42.8% 0.09 242.2)
-
Step 900
900
#1A4563
oklch(37.5% 0.07 242.4)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#1B73AA 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) | #5974AC | 0.054 |
| Deuteranopia (no green cones) | #4568A9 | 0.040 |
| Tritanopia (no blue cones) | #008187 | 0.080 |
| Achromatopsia (no color) | #6D6D6D | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B73AA
#1B73AA
oklch(53.3% 0.117 242.3)
- #9B5B0F
#9B5B0F
oklch(53.3% 0.116 62.8)
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 #1B73AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.022
- Ocean Blue #03719C ΔE 0.025
- Muted Blue #3B719F ΔE 0.025
- Mid Blue #276AB3 ΔE 0.032
- French Blue #436BAD ΔE 0.035
- Sea Blue #047495 ΔE 0.036
- Windows Blue #3778BF ΔE 0.041
Use #1B73AA 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.