#1566AF
Closest named color: Mid Blue (#276AB3). oklch(50.4% 0.137 251.3), rgb(21, 102, 175).
Aa
White text reads best on this color (5.91:1).
About this color
#1566AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.137 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.017 away. White text reads best on it, at 5.91:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.55:1 |
| White text | 5.91:1 |
Values
| HEX | #1566AF |
| RGB | rgb(21, 102, 175) |
| HSL | hsl(208, 79%, 38%) |
| OKLCH | oklch(50.4% 0.137 251.3) |
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 #1566AF | 5.91:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #1566AF | 3.55:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #1566AF text on white | 5.91:1 | AA | Lc 79.1 | Fine for body text |
| #1566AF text on black | 3.55:1 | AA large text | Lc -22.7 | 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 700.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4EB
oklch(80.9% 0.066 252.1)
-
Step 400
400
#6DA5E1
oklch(70.7% 0.106 251.1)
-
Step 500
500
#438DD8
oklch(63.1% 0.135 251.1)
-
Step 600
600
#1F75C6
oklch(55.6% 0.148 251.6)
-
Step 700
700 (this color)
#1566AF
oklch(50.4% 0.137 251.3)
-
Step 800
800
#12508A
oklch(42.6% 0.113 251.5)
-
Step 900
900
#18436F
oklch(37.7% 0.089 251.8)
-
Step 950
950
#0F2841
oklch(27.1% 0.056 250.6)
#1566AF 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) | #416BB2 | 0.038 |
| Deuteranopia (no green cones) | #265EAE | 0.022 |
| Tritanopia (no blue cones) | #007882 | 0.101 |
| Achromatopsia (no color) | #646464 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1566AF
#1566AF
oklch(50.4% 0.137 251.3)
- #8A5800
#8A5800
oklch(50.4% 0.108 71.5)
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 #1566AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.017
- French Blue #436BAD ΔE 0.040
- Peacock Blue #016795 ΔE 0.044
- Ocean Blue #03719C ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.052
- Muted Blue #3B719F ΔE 0.053
- Denim Blue #3B5B92 ΔE 0.054
- Dusky Blue #475F94 ΔE 0.055
Use #1566AF 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.