#588399
Closest named color: Grey Blue (#647D8E). oklch(58.7% 0.058 231.3), rgb(88, 131, 153).
Aa
Black text reads best on this color (5.12:1).
About this color
#588399 is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.058 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.023 away. Black text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.12:1 |
| White text | 4.10:1 |
Values
| HEX | #588399 |
| RGB | rgb(88, 131, 153) |
| HSL | hsl(200, 27%, 47%) |
| OKLCH | oklch(58.7% 0.058 231.3) |
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 #588399 | 4.10:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #588399 | 5.12:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #588399 text on white | 4.10:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #588399 text on black | 5.12:1 | AA | Lc -33.6 | 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 600.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE1
oklch(88.5% 0.015 231.2)
-
Step 300
300
#B0C4CF
oklch(80.9% 0.027 231.7)
-
Step 400
400
#87A6B6
oklch(70.7% 0.041 230.5)
-
Step 500
500
#6890A4
oklch(63.1% 0.053 230.3)
-
Step 600
600 (this color)
#588399
oklch(58.7% 0.058 231.3)
-
Step 700
700
#40667A
oklch(49% 0.054 232.4)
-
Step 800
800
#355463
oklch(42.8% 0.044 230)
-
Step 900
900
#2E4551
oklch(37.7% 0.035 231.6)
-
Step 950
950
#1B292F
oklch(27.1% 0.022 226.4)
#588399 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) | #78819A | 0.041 |
| Deuteranopia (no green cones) | #6F7A99 | 0.037 |
| Tritanopia (no blue cones) | #3E898A | 0.042 |
| Achromatopsia (no color) | #7D7D7D | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #588399
#588399
oklch(58.7% 0.058 231.3)
- #99735D
#99735D
oklch(58.8% 0.058 51.3)
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 #588399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.023
- Stormy Blue #507B9C ΔE 0.028
- Slate Gray #708090 ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Steel Grey #6F828A ΔE 0.034
- Cerulean #457B9D ΔE 0.035
- Steel #738595 ΔE 0.035
Use #588399 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.