#588B99
Closest named color: Steel (#738595). oklch(60.6% 0.058 217.1), rgb(88, 139, 153).
Aa
Black text reads best on this color (5.56:1).
About this color
#588B99 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 61%, its chroma 0.058 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Steel (#738595), ΔE 0.034 away. Black text reads best on it, at 5.56:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Steel (#738595) |
| Black text | 5.56:1 |
| White text | 3.77:1 |
Values
| HEX | #588B99 |
| RGB | rgb(88, 139, 153) |
| HSL | hsl(193, 27%, 47%) |
| OKLCH | oklch(60.6% 0.058 217.1) |
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 #588B99 | 3.77:1 | AA large text | Lc -70.7 | Content text, not long reading |
| Black text on #588B99 | 5.56:1 | AA | Lc 38.9 | Non-text elements, placeholder text |
| #588B99 text on white | 3.77:1 | AA large text | Lc 65.2 | Content text, not long reading |
| #588B99 text on black | 5.56:1 | AA | Lc -36.5 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCE0
oklch(88.5% 0.016 216.7)
-
Step 300
300
#ADC6CD
oklch(81% 0.029 216.5)
-
Step 400
400
#81A8B3
oklch(70.7% 0.045 216.9)
-
Step 500
500 (this color)
#588B99
oklch(60.6% 0.058 217.1)
-
Step 600
600
#447D8C
oklch(55.7% 0.064 216.8)
-
Step 700
700
#366977
oklch(49.1% 0.059 217.8)
-
Step 800
800
#2D5661
oklch(42.8% 0.049 217.2)
-
Step 900
900
#29474F
oklch(37.8% 0.038 216.7)
-
Step 950
950
#18292E
oklch(26.8% 0.024 218.3)
#588B99 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) | #81889A | 0.051 |
| Deuteranopia (no green cones) | #778099 | 0.047 |
| Tritanopia (no blue cones) | #3C908F | 0.035 |
| Achromatopsia (no color) | #838383 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588B99
#588B99
oklch(60.6% 0.058 217.1)
- #A27669
#A27669
oklch(60.6% 0.059 37.1)
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 #588B99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel #738595 ΔE 0.034
- Steel Grey #6F828A ΔE 0.036
- Light Slate Gray #778899 ΔE 0.037
- Slate Gray #708090 ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.039
- Grey Blue #647D8E ΔE 0.040
- Blue Grey #758DA3 ΔE 0.040
- Dusty Teal #4C9085 ΔE 0.041
Use #588B99 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.