#599CB9
Closest named color: Greyblue (#77A1B5). oklch(66% 0.081 227.9), rgb(89, 156, 185).
Aa
Black text reads best on this color (6.88:1).
About this color
#599CB9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.081 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.037 away. Black text reads best on it, at 6.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.88:1 |
| White text | 3.05:1 |
Values
| HEX | #599CB9 |
| RGB | rgb(89, 156, 185) |
| HSL | hsl(198, 41%, 54%) |
| OKLCH | oklch(66% 0.081 227.9) |
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 #599CB9 | 3.05:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #599CB9 | 6.88:1 | AA | Lc 46.8 | Large or bold text, headings |
| #599CB9 text on white | 3.05:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #599CB9 text on black | 6.88:1 | AA | Lc -44.5 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D5
oklch(80.9% 0.04 228.7)
-
Step 400
400
#76A9C0
oklch(70.7% 0.064 227.8)
-
Step 500
500 (this color)
#599CB9
oklch(66% 0.081 227.9)
-
Step 600
600
#307D9C
oklch(55.6% 0.088 228.3)
-
Step 700
700
#226985
oklch(49% 0.082 228.5)
-
Step 800
800
#1F566C
oklch(42.7% 0.067 228.1)
-
Step 900
900
#204758
oklch(37.7% 0.053 228.9)
-
Step 950
950
#132A33
oklch(27.1% 0.033 225.6)
#599CB9 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) | #8D9ABB | 0.060 |
| Deuteranopia (no green cones) | #7F8FB9 | 0.053 |
| Tritanopia (no blue cones) | #1EA4A5 | 0.058 |
| Achromatopsia (no color) | #949494 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599CB9
#599CB9
oklch(66% 0.081 227.9)
- #BB8366
#BB8366
oklch(65.9% 0.081 48.3)
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 #599CB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.037
- Cadet Blue #5F9EA0 ΔE 0.040
- Faded Blue #658CBB ΔE 0.047
- Silver Lake Blue #778DA9 ΔE 0.049
- Blue Grey #758DA3 ΔE 0.050
- Bluegrey #85A3B2 ΔE 0.056
- Bluey Grey #89A0B0 ΔE 0.058
- Cool Gray #8D99AE ΔE 0.059
Use #599CB9 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.