#1B73B3
Closest named color: Nice Blue (#107AB0). oklch(53.8% 0.127 246.2), rgb(27, 115, 179).
Aa
White text reads best on this color (5.06:1).
About this color
#1B73B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.127 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.022 away. White text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.14:1 |
| White text | 5.06:1 |
Values
| HEX | #1B73B3 |
| RGB | rgb(27, 115, 179) |
| HSL | hsl(205, 74%, 40%) |
| OKLCH | oklch(53.8% 0.127 246.2) |
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 #1B73B3 | 5.06:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #1B73B3 | 4.14:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #1B73B3 text on white | 5.06:1 | AA | Lc 74.5 | Content text, not long reading |
| #1B73B3 text on black | 4.14:1 | AA large text | Lc -27.2 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A3C5E4
oklch(80.9% 0.057 246.1)
-
Step 400
400
#70A6D7
oklch(70.7% 0.092 246.9)
-
Step 500
500
#468FCC
oklch(63% 0.118 246.4)
-
Step 600
600 (this color)
#1B73B3
oklch(53.8% 0.127 246.2)
-
Step 700
700
#13659F
oklch(49.1% 0.118 246.1)
-
Step 800
800
#155381
oklch(42.8% 0.097 245.9)
-
Step 900
900
#194568
oklch(37.8% 0.077 245.9)
-
Step 950
950
#10283D
oklch(26.9% 0.05 247.3)
#1B73B3 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) | #5576B6 | 0.050 |
| Deuteranopia (no green cones) | #3E68B2 | 0.036 |
| Tritanopia (no blue cones) | #00838A | 0.091 |
| Achromatopsia (no color) | #6F6F6F | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B73B3
#1B73B3
oklch(53.8% 0.127 246.2)
- #9C5D00
#9C5D00
oklch(53.7% 0.12 65.7)
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 #1B73B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.022
- Mid Blue #276AB3 ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.027
- Windows Blue #3778BF ΔE 0.030
- French Blue #436BAD ΔE 0.033
- Muted Blue #3B719F ΔE 0.035
- Ocean Blue #03719C ΔE 0.038
- Dull Blue #49759C ΔE 0.050
Use #1B73B3 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.