#5B9599
Closest named color: Cadet Blue (#5F9EA0). oklch(63.2% 0.061 201.4), rgb(91, 149, 153).
Aa
Black text reads best on this color (6.20:1).
About this color
#5B9599 is a medium-light, muted teal or cyan. In OKLCH its lightness is 63%, its chroma 0.061 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.027 away. Black text reads best on it, at 6.20:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (63%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.20:1 |
| White text | 3.38:1 |
Values
| HEX | #5B9599 |
| RGB | rgb(91, 149, 153) |
| HSL | hsl(184, 25%, 48%) |
| OKLCH | oklch(63.2% 0.061 201.4) |
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 #5B9599 | 3.38:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #5B9599 | 6.20:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #5B9599 text on white | 3.38:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #5B9599 text on black | 6.20:1 | AA | Lc -40.5 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E4ECEC
oklch(93.7% 0.009 197)
-
Step 200
200
#CDDDDE
oklch(88.6% 0.017 201.4)
-
Step 300
300
#ABC7C9
oklch(81% 0.03 201.9)
-
Step 400
400
#7EAAAD
oklch(70.7% 0.047 201.4)
-
Step 500
500 (this color)
#5B9599
oklch(63.2% 0.061 201.4)
-
Step 600
600
#3E7F83
oklch(55.6% 0.067 200.8)
-
Step 700
700
#306B6F
oklch(49% 0.061 201.3)
-
Step 800
800
#29575B
oklch(42.6% 0.051 202.9)
-
Step 900
900
#26484A
oklch(37.7% 0.04 200.5)
-
Step 950
950
#172A2C
oklch(27% 0.025 204.3)
#5B9599 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) | #8D9099 | 0.062 |
| Deuteranopia (no green cones) | #828899 | 0.057 |
| Tritanopia (no blue cones) | #409996 | 0.026 |
| Achromatopsia (no color) | #8B8B8B | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B9599
#5B9599
oklch(63.2% 0.061 201.4)
- #AC7B79
#AC7B79
oklch(63.1% 0.062 21.6)
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 #5B9599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.027
- Sea #3C9992 ΔE 0.032
- Grey Teal #5E9B8A ΔE 0.033
- Dull Teal #5F9E8F ΔE 0.035
- Dusty Teal #4C9085 ΔE 0.036
- Blue Grey #758DA3 ΔE 0.043
- Light Slate Gray #778899 ΔE 0.047
- Persian Green #2A9D8F ΔE 0.047
Use #5B9599 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.