#557D82
Closest named color: Grey Blue (#647D8E). oklch(56.2% 0.045 205.8), rgb(85, 125, 130).
Aa
Black text reads best on this color (4.64:1).
About this color
#557D82 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.045 and its hue 206°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.028 away. Black text reads best on it, at 4.64:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #557D82 |
| RGB | rgb(85, 125, 130) |
| HSL | hsl(187, 21%, 42%) |
| OKLCH | oklch(56.2% 0.045 205.8) |
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 #557D82 | 4.52:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #557D82 | 4.64:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #557D82 text on white | 4.52:1 | AA | Lc 71.4 | Content text, not long reading |
| #557D82 text on black | 4.64:1 | AA | Lc -30.3 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D1DBDD
oklch(88.4% 0.011 211)
-
Step 300
300
#B2C5C7
oklch(81% 0.021 204.4)
-
Step 400
400
#8AA7AA
oklch(70.7% 0.032 204.2)
-
Step 500
500
#6C9196
oklch(63.1% 0.042 206.5)
-
Step 600
600 (this color)
#557D82
oklch(56.2% 0.045 205.8)
-
Step 700
700
#44686C
oklch(49.2% 0.042 204.7)
-
Step 800
800
#385558
oklch(42.8% 0.035 204.1)
-
Step 900
900
#304649
oklch(37.7% 0.028 206.6)
-
Step 950
950
#1D292A
oklch(27% 0.017 202.6)
#557D82 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) | #777A82 | 0.045 |
| Deuteranopia (no green cones) | #6F7482 | 0.041 |
| Tritanopia (no blue cones) | #44807E | 0.022 |
| Achromatopsia (no color) | #767676 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557D82
#557D82
oklch(56.2% 0.045 205.8)
- #8E6B67
#8E6B67
oklch(56.2% 0.045 26.1)
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 #557D82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.028
- Battleship Grey #6B7C85 ΔE 0.029
- Battleship Gray #6C757D ΔE 0.034
- Steel Grey #6F828A ΔE 0.039
- Metallic Blue #4F738E ΔE 0.041
- Slate Gray #708090 ΔE 0.043
- Stormy Blue #507B9C ΔE 0.043
- Cerulean #457B9D ΔE 0.047
Use #557D82 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.