#557F85
Closest named color: Grey Blue (#647D8E). oklch(56.8% 0.047 207.2), rgb(85, 127, 133).
Aa
Black text reads best on this color (4.76:1).
About this color
#557F85 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 57%, its chroma 0.047 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.026 away. Black text reads best on it, at 4.76:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.76:1 |
| White text | 4.41:1 |
Values
| HEX | #557F85 |
| RGB | rgb(85, 127, 133) |
| HSL | hsl(188, 22%, 43%) |
| OKLCH | oklch(56.8% 0.047 207.2) |
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 #557F85 | 4.41:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #557F85 | 4.76:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #557F85 text on white | 4.41:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #557F85 text on black | 4.76:1 | AA | Lc -31.1 | 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
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D1DBDD
oklch(88.4% 0.011 211)
-
Step 300
300
#B2C5C8
oklch(81% 0.021 208.1)
-
Step 400
400
#89A7AB
oklch(70.7% 0.034 206.4)
-
Step 500
500
#6B9197
oklch(63.1% 0.043 208.2)
-
Step 600
600 (this color)
#557F85
oklch(56.8% 0.047 207.2)
-
Step 700
700
#42686D
oklch(49.1% 0.044 206.3)
-
Step 800
800
#375559
oklch(42.8% 0.036 206.4)
-
Step 900
900
#304649
oklch(37.7% 0.028 206.6)
-
Step 950
950
#1C292B
oklch(27% 0.018 207.9)
#557F85 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) | #787C85 | 0.046 |
| Deuteranopia (no green cones) | #707585 | 0.043 |
| Tritanopia (no blue cones) | #438281 | 0.022 |
| Achromatopsia (no color) | #787878 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557F85
#557F85
oklch(56.8% 0.047 207.2)
- #916C68
#916C68
oklch(56.7% 0.048 25.7)
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 #557F85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.026
- Battleship Grey #6B7C85 ΔE 0.028
- Steel Grey #6F828A ΔE 0.036
- Battleship Gray #6C757D ΔE 0.037
- Slate Gray #708090 ΔE 0.040
- Stormy Blue #507B9C ΔE 0.042
- Metallic Blue #4F738E ΔE 0.044
- Cerulean #457B9D ΔE 0.045
Use #557F85 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.