#599FCF
Closest named color: Greyblue (#77A1B5). oklch(67.6% 0.101 240.4), rgb(89, 159, 207).
Aa
Black text reads best on this color (7.28:1).
About this color
#599FCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.101 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.050 away. Black text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.28:1 |
| White text | 2.88:1 |
Values
| HEX | #599FCF |
| RGB | rgb(89, 159, 207) |
| HSL | hsl(204, 55%, 58%) |
| OKLCH | oklch(67.6% 0.101 240.4) |
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 #599FCF | 2.88:1 | Fails | Lc -60.2 | Content text, not long reading |
| Black text on #599FCF | 7.28:1 | AAA | Lc 49.1 | Large or bold text, headings |
| #599FCF text on white | 2.88:1 | Fails | Lc 54.9 | Large or bold text, headings |
| #599FCF text on black | 7.28:1 | AAA | Lc -46.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C5DDEE
oklch(88.5% 0.035 238.7)
-
Step 300
300
#9CC7E6
oklch(81% 0.063 239.9)
-
Step 400
400 (this color)
#599FCF
oklch(67.6% 0.101 240.4)
-
Step 500
500
#2D92CF
oklch(63.1% 0.128 240.5)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#064669
oklch(37.6% 0.083 240.5)
-
Step 950
950
#08293E
oklch(26.9% 0.054 241.2)
#599FCF 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) | #8A9FD1 | 0.055 |
| Deuteranopia (no green cones) | #7993CE | 0.044 |
| Tritanopia (no blue cones) | #00ABAF | 0.079 |
| Achromatopsia (no color) | #989898 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599FCF
#599FCF
oklch(67.6% 0.101 240.4)
- #C48854
#C48854
oklch(67.6% 0.1 60.8)
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 #599FCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.050
- Faded Blue #658CBB ΔE 0.053
- Cornflower Blue #6495ED ΔE 0.060
- Chefchaouen Blue #4895EF ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.066
- Turquoise Blue #06B1C4 ΔE 0.066
- Dark Sky Blue #448EE4 ΔE 0.067
- Silver Lake Blue #778DA9 ΔE 0.067
Use #599FCF 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.