#599FCC
Closest named color: Greyblue (#77A1B5). oklch(67.5% 0.097 238.7), rgb(89, 159, 204).
Aa
Black text reads best on this color (7.25:1).
About this color
#599FCC is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.097 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.046 away. Black text reads best on it, at 7.25:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.25:1 |
| White text | 2.89:1 |
Values
| HEX | #599FCC |
| RGB | rgb(89, 159, 204) |
| HSL | hsl(203, 53%, 57%) |
| OKLCH | oklch(67.5% 0.097 238.7) |
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 #599FCC | 2.89:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #599FCC | 7.25:1 | AAA | Lc 49.0 | Large or bold text, headings |
| #599FCC text on white | 2.89:1 | Fails | Lc 55.1 | Large or bold text, headings |
| #599FCC text on black | 7.25:1 | AAA | Lc -46.7 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C6DDED
oklch(88.5% 0.033 238.2)
-
Step 300
300
#9DC7E4
oklch(80.9% 0.061 238.6)
-
Step 400
400 (this color)
#599FCC
oklch(67.5% 0.097 238.7)
-
Step 500
500
#2D93CC
oklch(63.2% 0.124 238.4)
-
Step 600
600
#007CB3
oklch(55.7% 0.124 238.2)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#00557D
oklch(42.7% 0.096 238.5)
-
Step 900
900
#064767
oklch(37.8% 0.08 237.7)
-
Step 950
950
#092A3D
oklch(27.2% 0.051 238.4)
#599FCC 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) | #8B9ECE | 0.056 |
| Deuteranopia (no green cones) | #7B93CB | 0.046 |
| Tritanopia (no blue cones) | #00AAAE | 0.076 |
| Achromatopsia (no color) | #989898 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599FCC
#599FCC
oklch(67.5% 0.097 238.7)
- #C38858
#C38858
oklch(67.5% 0.097 59.3)
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 #599FCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.046
- Faded Blue #658CBB ΔE 0.052
- Bluegrey #85A3B2 ΔE 0.063
- Cornflower Blue #6495ED ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.064
- Silver Lake Blue #778DA9 ΔE 0.065
- Bluey Grey #89A0B0 ΔE 0.065
- Cadet Blue #5F9EA0 ΔE 0.066
Use #599FCC 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.