#557B8D
Closest named color: Grey Blue (#647D8E). oklch(56.1% 0.051 229.1), rgb(85, 123, 141).
Aa
Black text reads best on this color (4.60:1).
About this color
#557B8D is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.051 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.020 away. Black text reads best on it, at 4.60:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.60:1 |
| White text | 4.56:1 |
Values
| HEX | #557B8D |
| RGB | rgb(85, 123, 141) |
| HSL | hsl(199, 25%, 44%) |
| OKLCH | oklch(56.1% 0.051 229.1) |
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 #557B8D | 4.56:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #557B8D | 4.60:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #557B8D text on white | 4.56:1 | AA | Lc 71.6 | Content text, not long reading |
| #557B8D text on black | 4.60:1 | AA | Lc -30.0 | 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
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B2C4CD
oklch(80.9% 0.023 229.2)
-
Step 400
400
#8AA5B3
oklch(70.6% 0.036 230.5)
-
Step 500
500
#6C8FA0
oklch(63% 0.047 229.3)
-
Step 600
600 (this color)
#557B8D
oklch(56.1% 0.051 229.1)
-
Step 700
700
#446676
oklch(49.1% 0.047 229.1)
-
Step 800
800
#385360
oklch(42.6% 0.039 229.5)
-
Step 900
900
#31454F
oklch(37.8% 0.03 230.2)
-
Step 950
950
#1D282E
oklch(26.9% 0.019 232.2)
#557B8D 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) | #72798E | 0.038 |
| Deuteranopia (no green cones) | #6A738D | 0.034 |
| Tritanopia (no blue cones) | #408081 | 0.036 |
| Achromatopsia (no color) | #767676 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557B8D
#557B8D
oklch(56.1% 0.051 229.1)
- #8E6C5B
#8E6C5B
oklch(56.1% 0.051 47.8)
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 #557B8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.020
- Stormy Blue #507B9C ΔE 0.024
- Metallic Blue #4F738E ΔE 0.026
- Cerulean #457B9D ΔE 0.029
- Battleship Grey #6B7C85 ΔE 0.030
- Battleship Gray #6C757D ΔE 0.036
- Dull Blue #49759C ΔE 0.036
- Slate Gray #708090 ΔE 0.039
Use #557B8D 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.