#599CC4
Closest named color: Greyblue (#77A1B5). oklch(66.4% 0.091 236.5), rgb(89, 156, 196).
Aa
Black text reads best on this color (6.97:1).
About this color
#599CC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.091 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.043 away. Black text reads best on it, at 6.97:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.97:1 |
| White text | 3.00:1 |
Values
| HEX | #599CC4 |
| RGB | rgb(89, 156, 196) |
| HSL | hsl(202, 48%, 56%) |
| OKLCH | oklch(66.4% 0.091 236.5) |
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 #599CC4 | 3.00:1 | AA large text | Lc -62.0 | Content text, not long reading |
| Black text on #599CC4 | 6.97:1 | AA | Lc 47.4 | Large or bold text, headings |
| #599CC4 text on white | 3.00:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #599CC4 text on black | 6.97:1 | AA | Lc -45.1 | 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 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
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A6C6DA
oklch(81% 0.045 235.5)
-
Step 400
400
#75A8C7
oklch(70.7% 0.071 235.8)
-
Step 500
500 (this color)
#599CC4
oklch(66.4% 0.091 236.5)
-
Step 600
600
#2F7BA5
oklch(55.5% 0.098 236.7)
-
Step 700
700
#20688E
oklch(49.2% 0.092 236.5)
-
Step 800
800
#1D5573
oklch(42.7% 0.076 236.1)
-
Step 900
900
#1F465D
oklch(37.7% 0.059 237.1)
-
Step 950
950
#132936
oklch(26.9% 0.037 236.3)
#599CC4 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) | #899BC6 | 0.054 |
| Deuteranopia (no green cones) | #7B90C3 | 0.047 |
| Tritanopia (no blue cones) | #04A6A9 | 0.071 |
| Achromatopsia (no color) | #959595 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599CC4
#599CC4
oklch(66.4% 0.091 236.5)
- #BE855B
#BE855B
oklch(66.4% 0.091 56.8)
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 #599CC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.043
- Faded Blue #658CBB ΔE 0.043
- Silver Lake Blue #778DA9 ΔE 0.054
- Cadet Blue #5F9EA0 ΔE 0.057
- Blue Grey #758DA3 ΔE 0.058
- Bluegrey #85A3B2 ΔE 0.061
- Bluey Grey #89A0B0 ΔE 0.063
- Dusty Blue #5A86AD ΔE 0.064
Use #599CC4 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.