#557D8D
Closest named color: Grey Blue (#647D8E). oklch(56.6% 0.051 224.9), rgb(85, 125, 141).
Aa
Black text reads best on this color (4.70:1).
About this color
#557D8D is a medium-dark, muted teal or cyan. In OKLCH its lightness is 57%, its chroma 0.051 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.019 away. Black text reads best on it, at 4.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.70:1 |
| White text | 4.46:1 |
Values
| HEX | #557D8D |
| RGB | rgb(85, 125, 141) |
| HSL | hsl(197, 25%, 44%) |
| OKLCH | oklch(56.6% 0.051 224.9) |
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 #557D8D | 4.46:1 | AA large text | Lc -76.4 | Fine for body text |
| Black text on #557D8D | 4.70:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #557D8D text on white | 4.46:1 | AA large text | Lc 70.9 | Content text, not long reading |
| #557D8D text on black | 4.70:1 | AA | Lc -30.7 | 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
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B2C4CC
oklch(80.9% 0.023 226.2)
-
Step 400
400
#89A6B2
oklch(70.7% 0.037 224.9)
-
Step 500
500
#6B909F
oklch(63.1% 0.047 224.9)
-
Step 600
600 (this color)
#557D8D
oklch(56.6% 0.051 224.9)
-
Step 700
700
#426775
oklch(49.2% 0.048 223.9)
-
Step 800
800
#37545F
oklch(42.8% 0.039 223.7)
-
Step 900
900
#30454E
oklch(37.7% 0.03 226.3)
-
Step 950
950
#1C292E
oklch(27.1% 0.02 223.6)
#557D8D 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) | #747B8E | 0.040 |
| Deuteranopia (no green cones) | #6C748D | 0.037 |
| Tritanopia (no blue cones) | #408282 | 0.034 |
| Achromatopsia (no color) | #777777 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557D8D
#557D8D
oklch(56.6% 0.051 224.9)
- #906D5E
#906D5E
oklch(56.6% 0.05 44.3)
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 #557D8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.019
- Stormy Blue #507B9C ΔE 0.026
- Battleship Grey #6B7C85 ΔE 0.028
- Cerulean #457B9D ΔE 0.031
- Metallic Blue #4F738E ΔE 0.032
- Slate Gray #708090 ΔE 0.037
- Battleship Gray #6C757D ΔE 0.037
- Steel Grey #6F828A ΔE 0.038
Use #557D8D 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.