#599FBC
Closest named color: Greyblue (#77A1B5). oklch(66.8% 0.083 227), rgb(89, 159, 188).
Aa
Black text reads best on this color (7.11:1).
About this color
#599FBC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 67%, its chroma 0.083 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.034 away. Black text reads best on it, at 7.11:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.11:1 |
| White text | 2.95:1 |
Values
| HEX | #599FBC |
| RGB | rgb(89, 159, 188) |
| HSL | hsl(198, 42%, 54%) |
| OKLCH | oklch(66.8% 0.083 227) |
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 #599FBC | 2.95:1 | Fails | Lc -61.2 | Content text, not long reading |
| Black text on #599FBC | 7.11:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #599FBC text on white | 2.95:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #599FBC text on black | 7.11:1 | AAA | Lc -45.9 | 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 500.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADCE5
oklch(88.4% 0.023 229.1)
-
Step 300
300
#A6C6D5
oklch(80.8% 0.04 227.9)
-
Step 400
400
#75A9C0
oklch(70.7% 0.064 227.4)
-
Step 500
500 (this color)
#599FBC
oklch(66.8% 0.083 227)
-
Step 600
600
#2C7E9C
oklch(55.7% 0.09 226.4)
-
Step 700
700
#1E6A85
oklch(49.2% 0.083 226.5)
-
Step 800
800
#1C566C
oklch(42.6% 0.069 227.2)
-
Step 900
900
#1E4758
oklch(37.6% 0.054 228)
-
Step 950
950
#132A33
oklch(27.1% 0.033 225.6)
#599FBC 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) | #909CBE | 0.063 |
| Deuteranopia (no green cones) | #8191BC | 0.056 |
| Tritanopia (no blue cones) | #18A8A8 | 0.059 |
| Achromatopsia (no color) | #969696 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599FBC
#599FBC
oklch(66.8% 0.083 227)
- #BF8568
#BF8568
oklch(66.8% 0.083 47.4)
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 #599FBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.034
- Cadet Blue #5F9EA0 ΔE 0.042
- Bluegrey #85A3B2 ΔE 0.052
- Faded Blue #658CBB ΔE 0.054
- Bluey Grey #89A0B0 ΔE 0.055
- Silver Lake Blue #778DA9 ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.056
- Blue Grey #758DA3 ΔE 0.057
Use #599FBC 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.