#599BC4
Closest named color: Faded Blue (#658CBB). oklch(66.2% 0.091 237.6), rgb(89, 155, 196).
Aa
Black text reads best on this color (6.91:1).
About this color
#599BC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.091 and its hue 238°. 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 6.91:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.91:1 |
| White text | 3.03:1 |
Values
| HEX | #599BC4 |
| RGB | rgb(89, 155, 196) |
| HSL | hsl(203, 48%, 56%) |
| OKLCH | oklch(66.2% 0.091 237.6) |
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 #599BC4 | 3.03:1 | AA large text | Lc -62.4 | Content text, not long reading |
| Black text on #599BC4 | 6.91:1 | AA | Lc 47.0 | Large or bold text, headings |
| #599BC4 text on white | 3.03:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #599BC4 text on black | 6.91:1 | AA | Lc -44.7 | 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
#A7C6DA
oklch(81% 0.044 236.4)
-
Step 400
400
#76A8C8
oklch(70.8% 0.071 237.2)
-
Step 500
500 (this color)
#599BC4
oklch(66.2% 0.091 237.6)
-
Step 600
600
#307BA6
oklch(55.6% 0.099 237.6)
-
Step 700
700
#21688E
oklch(49.2% 0.092 236.7)
-
Step 800
800
#1E5574
oklch(42.8% 0.077 237.3)
-
Step 900
900
#1F465D
oklch(37.7% 0.059 237.1)
-
Step 950
950
#132937
oklch(27% 0.038 238.3)
#599BC4 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) | #889AC6 | 0.053 |
| Deuteranopia (no green cones) | #7A8FC3 | 0.046 |
| Tritanopia (no blue cones) | #05A5A9 | 0.071 |
| Achromatopsia (no color) | #949494 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599BC4
#599BC4
oklch(66.2% 0.091 237.6)
- #BD8459
#BD8459
oklch(66.1% 0.091 57.4)
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 #599BC4, 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 0.045
- Silver Lake Blue #778DA9 ΔE 0.053
- Blue Grey #758DA3 ΔE 0.057
- Cadet Blue #5F9EA0 ΔE 0.058
- Dusty Blue #5A86AD ΔE 0.061
- Bluegrey #85A3B2 ΔE 0.063
- Bluey Grey #89A0B0 ΔE 0.064
Use #599BC4 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.