#2566AF
Closest named color: Mid Blue (#276AB3). oklch(50.8% 0.133 254), rgb(37, 102, 175).
Aa
White text reads best on this color (5.83:1).
About this color
#2566AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.133 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.012 away. White text reads best on it, at 5.83:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.59:1 |
| White text | 5.83:1 |
Values
| HEX | #2566AF |
| RGB | rgb(37, 102, 175) |
| HSL | hsl(212, 65%, 42%) |
| OKLCH | oklch(50.8% 0.133 254) |
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 #2566AF | 5.83:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #2566AF | 3.59:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #2566AF text on white | 5.83:1 | AA | Lc 78.8 | Fine for body text |
| #2566AF text on black | 3.59:1 | AA large text | Lc -23.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C3EA
oklch(80.8% 0.065 254.3)
-
Step 400
400
#73A4E0
oklch(70.8% 0.103 254)
-
Step 500
500
#4C8CD7
oklch(63.2% 0.131 253.8)
-
Step 600
600
#2D74C4
oklch(55.6% 0.143 254)
-
Step 700
700 (this color)
#2566AF
oklch(50.8% 0.133 254)
-
Step 800
800
#1C5089
oklch(42.8% 0.109 253.5)
-
Step 900
900
#1D426E
oklch(37.6% 0.087 254.4)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#2566AF 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) | #426CB2 | 0.033 |
| Deuteranopia (no green cones) | #2A5FAE | 0.019 |
| Tritanopia (no blue cones) | #007782 | 0.100 |
| Achromatopsia (no color) | #656565 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2566AF
#2566AF
oklch(50.8% 0.133 254)
- #895A00
#895A00
oklch(50.7% 0.107 73.9)
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 #2566AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.012
- French Blue #436BAD ΔE 0.032
- Peacock Blue #016795 ΔE 0.047
- Flat Blue #3C73A8 ΔE 0.047
- Muted Blue #3B719F ΔE 0.049
- Ocean Blue #03719C ΔE 0.050
- Dusky Blue #475F94 ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.051
Use #2566AF 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.