#2559B8
Closest named color: Mid Blue (#276AB3). oklch(48.5% 0.161 261.2), rgb(37, 89, 184).
Aa
White text reads best on this color (6.56:1).
About this color
#2559B8 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.161 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.049 away. White text reads best on it, at 6.56:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.19:1 |
| White text | 6.56:1 |
Values
| HEX | #2559B8 |
| RGB | rgb(37, 89, 184) |
| HSL | hsl(219, 67%, 43%) |
| OKLCH | oklch(48.5% 0.161 261.2) |
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 #2559B8 | 6.56:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #2559B8 | 3.19:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #2559B8 text on white | 6.56:1 | AA | Lc 82.0 | Fine for body text |
| #2559B8 text on black | 3.19:1 | AA large text | Lc -19.9 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A5C2F3
oklch(81% 0.077 260.8)
-
Step 400
400
#74A0EE
oklch(70.7% 0.125 261.3)
-
Step 500
500
#5086E8
oklch(63.1% 0.159 261.3)
-
Step 600
600
#346DD6
oklch(55.5% 0.173 261.3)
-
Step 700
700 (this color)
#2559B8
oklch(48.5% 0.161 261.2)
-
Step 800
800
#214B96
oklch(42.7% 0.132 260.9)
-
Step 900
900
#203F78
oklch(37.7% 0.104 261.4)
-
Step 950
950
#132546
oklch(26.9% 0.066 261.5)
#2559B8 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) | #1964BB | 0.029 |
| Deuteranopia (no green cones) | #0057B6 | 0.019 |
| Tritanopia (no blue cones) | #007080 | 0.124 |
| Achromatopsia (no color) | #5D5D5D | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2559B8
#2559B8
oklch(48.5% 0.161 261.2)
- #7C5800
#7C5800
oklch(48.6% 0.1 81)
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 #2559B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.049
- Blue Blue #2242C7 ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.065
- French Blue #436BAD ΔE 0.065
- Warm Blue #4B57DB ΔE 0.068
- Dusk Blue #26538D ΔE 0.070
- Dusky Blue #475F94 ΔE 0.071
- Peacock Blue #016795 ΔE 0.075
Use #2559B8 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.