#557F8F
Closest named color: Grey Blue (#647D8E). oklch(57.2% 0.053 223.9), rgb(85, 127, 143).
Aa
Black text reads best on this color (4.81:1).
About this color
#557F8F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 57%, its chroma 0.053 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.018 away. Black text reads best on it, at 4.81:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.81:1 |
| White text | 4.35:1 |
Values
| HEX | #557F8F |
| RGB | rgb(85, 127, 143) |
| HSL | hsl(197, 25%, 45%) |
| OKLCH | oklch(57.2% 0.053 223.9) |
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 #557F8F | 4.35:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #557F8F | 4.81:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #557F8F text on white | 4.35:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #557F8F text on black | 4.81:1 | AA | Lc -31.5 | 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
#D0DBE0
oklch(88.5% 0.014 226.6)
-
Step 300
300
#B1C4CC
oklch(80.8% 0.024 224.9)
-
Step 400
400
#88A6B2
oklch(70.7% 0.037 224.1)
-
Step 500
500
#6A909F
oklch(63.1% 0.048 224.3)
-
Step 600
600 (this color)
#557F8F
oklch(57.2% 0.053 223.9)
-
Step 700
700
#416775
oklch(49.1% 0.049 223.3)
-
Step 800
800
#36545F
oklch(42.7% 0.04 223)
-
Step 900
900
#2F454E
oklch(37.6% 0.031 225.3)
-
Step 950
950
#1C292E
oklch(27.1% 0.02 223.6)
#557F8F 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) | #767D90 | 0.042 |
| Deuteranopia (no green cones) | #6D768F | 0.038 |
| Tritanopia (no blue cones) | #3E8484 | 0.035 |
| Achromatopsia (no color) | #797979 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557F8F
#557F8F
oklch(57.2% 0.053 223.9)
- #936E5F
#936E5F
oklch(57.1% 0.053 43.1)
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 #557F8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.018
- Stormy Blue #507B9C ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.029
- Cerulean #457B9D ΔE 0.032
- Slate Gray #708090 ΔE 0.034
- Steel Grey #6F828A ΔE 0.035
- Metallic Blue #4F738E ΔE 0.037
- Battleship Gray #6C757D ΔE 0.040
Use #557F8F 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.