#599BC6
Closest named color: Faded Blue (#658CBB). oklch(66.3% 0.093 238.9), rgb(89, 155, 198).
Aa
Black text reads best on this color (6.92:1).
About this color
#599BC6 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.093 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.041 away. Black text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #599BC6 |
| RGB | rgb(89, 155, 198) |
| HSL | hsl(204, 49%, 56%) |
| OKLCH | oklch(66.3% 0.093 238.9) |
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 #599BC6 | 3.03:1 | AA large text | Lc -62.3 | Content text, not long reading |
| Black text on #599BC6 | 6.92:1 | AA | Lc 47.1 | Large or bold text, headings |
| #599BC6 text on white | 3.03:1 | AA large text | Lc 56.9 | Large or bold text, headings |
| #599BC6 text on black | 6.92:1 | AA | Lc -44.8 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A6C5DB
oklch(80.8% 0.046 239.1)
-
Step 400
400
#75A7C9
oklch(70.6% 0.073 238.9)
-
Step 500
500 (this color)
#599BC6
oklch(66.3% 0.093 238.9)
-
Step 600
600
#307BA8
oklch(55.7% 0.101 238.8)
-
Step 700
700
#216790
oklch(49% 0.094 239.1)
-
Step 800
800
#1E5475
oklch(42.6% 0.078 239.4)
-
Step 900
900
#1F465E
oklch(37.7% 0.06 238.3)
-
Step 950
950
#132937
oklch(27% 0.038 238.3)
#599BC6 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) | #889AC8 | 0.053 |
| Deuteranopia (no green cones) | #798FC5 | 0.045 |
| Tritanopia (no blue cones) | #00A6A9 | 0.075 |
| Achromatopsia (no color) | #949494 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599BC6
#599BC6
oklch(66.3% 0.093 238.9)
- #BE8557
#BE8557
oklch(66.4% 0.094 59.1)
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 #599BC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.041
- Greyblue #77A1B5 ΔE 0.047
- Silver Lake Blue #778DA9 ΔE 0.055
- Blue Grey #758DA3 ΔE 0.059
- Cadet Blue #5F9EA0 ΔE 0.061
- Dusty Blue #5A86AD ΔE 0.062
- Bluegrey #85A3B2 ΔE 0.065
- Cool Gray #8D99AE ΔE 0.066
Use #599BC6 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.