#599CA3
Closest named color: Cadet Blue (#5F9EA0). oklch(65.1% 0.069 204.3), rgb(89, 156, 163).
Aa
Black text reads best on this color (6.70:1).
About this color
#599CA3 is a medium-light, muted teal or cyan. In OKLCH its lightness is 65%, its chroma 0.069 and its hue 204°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.010 away. Black text reads best on it, at 6.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.70:1 |
| White text | 3.13:1 |
Values
| HEX | #599CA3 |
| RGB | rgb(89, 156, 163) |
| HSL | hsl(186, 29%, 49%) |
| OKLCH | oklch(65.1% 0.069 204.3) |
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 #599CA3 | 3.13:1 | AA large text | Lc -63.6 | Content text, not long reading |
| Black text on #599CA3 | 6.70:1 | AA | Lc 45.8 | Large or bold text, headings |
| #599CA3 text on white | 3.13:1 | AA large text | Lc 58.2 | Large or bold text, headings |
| #599CA3 text on black | 6.70:1 | AA | Lc -43.5 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#A8C7CB
oklch(80.8% 0.034 206)
-
Step 400
400
#78ABB0
oklch(70.7% 0.054 203.7)
-
Step 500
500 (this color)
#599CA3
oklch(65.1% 0.069 204.3)
-
Step 600
600
#348088
oklch(55.6% 0.075 204.8)
-
Step 700
700
#256C73
oklch(49.1% 0.07 204.4)
-
Step 800
800
#21585E
oklch(42.7% 0.058 205.1)
-
Step 900
900
#21494D
oklch(37.8% 0.045 204.1)
-
Step 950
950
#142B2D
oklch(27.1% 0.029 202.9)
#599CA3 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) | #9397A4 | 0.069 |
| Deuteranopia (no green cones) | #868EA3 | 0.062 |
| Tritanopia (no blue cones) | #34A19E | 0.032 |
| Achromatopsia (no color) | #929292 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599CA3
#599CA3
oklch(65.1% 0.069 204.3)
- #B67F7B
#B67F7B
oklch(65.1% 0.069 23.8)
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 #599CA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.010
- Dull Teal #5F9E8F ΔE 0.033
- Grey Teal #5E9B8A ΔE 0.037
- Sea #3C9992 ΔE 0.038
- Greyblue #77A1B5 ΔE 0.046
- Persian Green #2A9D8F ΔE 0.049
- Blue Grey #758DA3 ΔE 0.050
- Dusty Teal #4C9085 ΔE 0.053
Use #599CA3 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.