#2559BE
Closest named color: Mid Blue (#276AB3). oklch(49% 0.169 261.9), rgb(37, 89, 190).
Aa
White text reads best on this color (6.45:1).
About this color
#2559BE is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.169 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.052 away. White text reads best on it, at 6.45:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.25:1 |
| White text | 6.45:1 |
Values
| HEX | #2559BE |
| RGB | rgb(37, 89, 190) |
| HSL | hsl(220, 67%, 45%) |
| OKLCH | oklch(49% 0.169 261.9) |
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 #2559BE | 6.45:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #2559BE | 3.25:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #2559BE text on white | 6.45:1 | AA | Lc 81.5 | Fine for body text |
| #2559BE text on black | 3.25:1 | AA large text | Lc -20.4 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F6
oklch(80.8% 0.082 262.3)
-
Step 400
400
#739FF2
oklch(70.6% 0.131 262.3)
-
Step 500
500
#4E85ED
oklch(63.1% 0.167 261.8)
-
Step 600
600
#326CDB
oklch(55.6% 0.181 261.7)
-
Step 700
700 (this color)
#2559BE
oklch(49% 0.169 261.9)
-
Step 800
800
#204A9A
oklch(42.8% 0.139 261.7)
-
Step 900
900
#1F3E7A
oklch(37.5% 0.109 262)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#2559BE 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) | #0866C2 | 0.034 |
| Deuteranopia (no green cones) | #0058BC | 0.018 |
| Tritanopia (no blue cones) | #007283 | 0.131 |
| Achromatopsia (no color) | #5E5E5E | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2559BE
#2559BE
oklch(49% 0.169 261.9)
- #7D5900
#7D5900
oklch(48.9% 0.101 81.2)
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 #2559BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.052
- Blue Blue #2242C7 ΔE 0.057
- Warm Blue #4B57DB ΔE 0.061
- French Blue #436BAD ΔE 0.068
- Azul #1D5DEC ΔE 0.071
- Iris #6258C4 ΔE 0.073
- Denim Blue #3B5B92 ΔE 0.073
- Royal Blue #4169E1 ΔE 0.074
Use #2559BE 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.