#2564B3
Closest named color: Mid Blue (#276AB3). oklch(50.6% 0.141 256), rgb(37, 100, 179).
Aa
White text reads best on this color (5.91:1).
About this color
#2564B3 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.141 and its hue 256°. 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 (51%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.55:1 |
| White text | 5.91:1 |
Values
| HEX | #2564B3 |
| RGB | rgb(37, 100, 179) |
| HSL | hsl(213, 66%, 42%) |
| OKLCH | oklch(50.6% 0.141 256) |
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 #2564B3 | 5.91:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #2564B3 | 3.55:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #2564B3 text on white | 5.91:1 | AA | Lc 79.1 | Fine for body text |
| #2564B3 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A4C3ED
oklch(80.9% 0.069 256.1)
-
Step 400
400
#72A3E4
oklch(70.7% 0.109 255.8)
-
Step 500
500
#4C8ADC
oklch(63% 0.14 256.1)
-
Step 600
600
#2E73C9
oklch(55.7% 0.15 255.8)
-
Step 700
700 (this color)
#2564B3
oklch(50.6% 0.141 256)
-
Step 800
800
#1D4E8D
oklch(42.6% 0.117 256.3)
-
Step 900
900
#1E4271
oklch(37.8% 0.091 256.1)
-
Step 950
950
#122742
oklch(27.1% 0.057 255.5)
#2564B3 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) | #3C6BB6 | 0.030 |
| Deuteranopia (no green cones) | #1F5EB1 | 0.018 |
| Tritanopia (no blue cones) | #007783 | 0.107 |
| Achromatopsia (no color) | #646464 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2564B3
#2564B3
oklch(50.6% 0.141 256)
- #875B00
#875B00
oklch(50.6% 0.106 76.2)
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 #2564B3, 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 0.037
- Peacock Blue #016795 ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.055
- Denim Blue #3B5B92 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.055
- Muted Blue #3B719F ΔE 0.058
- Ocean Blue #03719C ΔE 0.059
Use #2564B3 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.