#559BBF
Closest named color: Faded Blue (#658CBB). oklch(65.8% 0.089 232.7), rgb(85, 155, 191).
Aa
Black text reads best on this color (6.82:1).
About this color
#559BBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.089 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.042 away. Black text reads best on it, at 6.82:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #559BBF |
| RGB | rgb(85, 155, 191) |
| HSL | hsl(200, 45%, 54%) |
| OKLCH | oklch(65.8% 0.089 232.7) |
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 #559BBF | 3.07:1 | AA large text | Lc -62.9 | Content text, not long reading |
| Black text on #559BBF | 6.82:1 | AA | Lc 46.6 | Large or bold text, headings |
| #559BBF text on white | 3.07:1 | AA large text | Lc 57.5 | Large or bold text, headings |
| #559BBF text on black | 6.82:1 | AA | Lc -44.3 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A6C6D8
oklch(80.9% 0.043 232.7)
-
Step 400
400
#74A9C5
oklch(70.8% 0.069 232.1)
-
Step 500
500 (this color)
#559BBF
oklch(65.8% 0.089 232.7)
-
Step 600
600
#2B7CA2
oklch(55.5% 0.096 232.9)
-
Step 700
700
#1D698B
oklch(49.2% 0.089 232.6)
-
Step 800
800
#1B5671
oklch(42.8% 0.074 232.3)
-
Step 900
900
#1D475B
oklch(37.8% 0.058 231.8)
-
Step 950
950
#122A35
oklch(27.1% 0.036 229.8)
#559BBF 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) | #8999C1 | 0.058 |
| Deuteranopia (no green cones) | #7B8EBE | 0.051 |
| Tritanopia (no blue cones) | #00A5A7 | 0.066 |
| Achromatopsia (no color) | #939393 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559BBF
#559BBF
oklch(65.8% 0.089 232.7)
- #BD825D
#BD825D
oklch(65.8% 0.089 52.7)
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 #559BBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.042
- Greyblue #77A1B5 ΔE 0.044
- Cadet Blue #5F9EA0 ΔE 0.051
- Silver Lake Blue #778DA9 ΔE 0.052
- Blue Grey #758DA3 ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.059
- Bluegrey #85A3B2 ΔE 0.063
- Off Blue #5684AE ΔE 0.064
Use #559BBF 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.