#599CBE
Closest named color: Greyblue (#77A1B5). oklch(66.2% 0.085 232.1), rgb(89, 156, 190).
Aa
Black text reads best on this color (6.92:1).
About this color
#599CBE is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.085 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.039 away. Black text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #599CBE |
| RGB | rgb(89, 156, 190) |
| HSL | hsl(200, 44%, 55%) |
| OKLCH | oklch(66.2% 0.085 232.1) |
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 #599CBE | 3.03:1 | AA large text | Lc -62.3 | Content text, not long reading |
| Black text on #599CBE | 6.92:1 | AA | Lc 47.1 | Large or bold text, headings |
| #599CBE text on white | 3.03:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #599CBE 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
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A7C6D7
oklch(80.9% 0.041 231.9)
-
Step 400
400
#76A8C3
oklch(70.6% 0.066 232.5)
-
Step 500
500 (this color)
#599CBE
oklch(66.2% 0.085 232.1)
-
Step 600
600
#307CA0
oklch(55.5% 0.092 232.5)
-
Step 700
700
#216989
oklch(49.2% 0.086 231.8)
-
Step 800
800
#1E556F
oklch(42.6% 0.071 232.5)
-
Step 900
900
#1F475A
oklch(37.8% 0.055 231.4)
-
Step 950
950
#132935
oklch(26.9% 0.036 234.1)
#599CBE 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) | #8B9AC0 | 0.057 |
| Deuteranopia (no green cones) | #7D8FBE | 0.051 |
| Tritanopia (no blue cones) | #16A5A7 | 0.064 |
| Achromatopsia (no color) | #949494 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599CBE
#599CBE
oklch(66.2% 0.085 232.1)
- #BD8461
#BD8461
oklch(66.2% 0.086 52.3)
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 #599CBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.039
- Faded Blue #658CBB ΔE 0.045
- Cadet Blue #5F9EA0 ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.051
- Blue Grey #758DA3 ΔE 0.053
- Bluegrey #85A3B2 ΔE 0.058
- Bluey Grey #89A0B0 ΔE 0.059
- Cool Gray #8D99AE ΔE 0.061
Use #599CBE 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.