#557A8A
Closest named color: Grey Blue (#647D8E). oklch(55.8% 0.048 226.7), rgb(85, 122, 138).
Aa
White text reads best on this color (4.62:1).
About this color
#557A8A is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.048 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.022 away. White text reads best on it, at 4.62:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.53:1 |
| White text | 4.62:1 |
Values
| HEX | #557A8A |
| RGB | rgb(85, 122, 138) |
| HSL | hsl(198, 24%, 44%) |
| OKLCH | oklch(55.8% 0.048 226.7) |
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 #557A8A | 4.62:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #557A8A | 4.53:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #557A8A text on white | 4.62:1 | AA | Lc 72.1 | Content text, not long reading |
| #557A8A text on black | 4.53:1 | AA | Lc -29.6 | Dividers and decoration only |
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
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B3C4CC
oklch(81% 0.022 227.6)
-
Step 400
400
#8AA6B2
oklch(70.8% 0.036 225.7)
-
Step 500
500
#6D8F9F
oklch(63% 0.045 228.4)
-
Step 600
600 (this color)
#557A8A
oklch(55.8% 0.048 226.7)
-
Step 700
700
#456675
oklch(49.1% 0.045 228.1)
-
Step 800
800
#39535F
oklch(42.6% 0.037 228.3)
-
Step 900
900
#31454E
oklch(37.7% 0.029 227.5)
-
Step 950
950
#1D282D
oklch(26.9% 0.018 227.5)
#557A8A 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) | #71788B | 0.037 |
| Deuteranopia (no green cones) | #6A728A | 0.034 |
| Tritanopia (no blue cones) | #427F7F | 0.033 |
| Achromatopsia (no color) | #757575 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557A8A
#557A8A
oklch(55.8% 0.048 226.7)
- #8C6B5C
#8C6B5C
oklch(55.7% 0.048 45.6)
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 #557A8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.022
- Metallic Blue #4F738E ΔE 0.025
- Stormy Blue #507B9C ΔE 0.028
- Battleship Grey #6B7C85 ΔE 0.030
- Cerulean #457B9D ΔE 0.032
- Battleship Gray #6C757D ΔE 0.033
- Dull Blue #49759C ΔE 0.038
- Slate Gray #708090 ΔE 0.041
Use #557A8A 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.