#557C8B
Closest named color: Grey Blue (#647D8E). oklch(56.3% 0.049 224), rgb(85, 124, 139).
Aa
Black text reads best on this color (4.64:1).
About this color
#557C8B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.049 and its hue 224°. 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 4.64:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #557C8B |
| RGB | rgb(85, 124, 139) |
| HSL | hsl(197, 24%, 44%) |
| OKLCH | oklch(56.3% 0.049 224) |
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 #557C8B | 4.52:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #557C8B | 4.64:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #557C8B text on white | 4.52:1 | AA | Lc 71.4 | Content text, not long reading |
| #557C8B text on black | 4.64:1 | AA | Lc -30.3 | 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
#B2C4CB
oklch(80.9% 0.022 223.1)
-
Step 400
400
#89A6B1
oklch(70.7% 0.036 222.8)
-
Step 500
500
#6C909E
oklch(63.1% 0.045 223.8)
-
Step 600
600 (this color)
#557C8B
oklch(56.3% 0.049 224)
-
Step 700
700
#436774
oklch(49.2% 0.046 222.7)
-
Step 800
800
#38545F
oklch(42.8% 0.038 224.5)
-
Step 900
900
#30454D
oklch(37.6% 0.03 223.5)
-
Step 950
950
#1D292D
oklch(27.2% 0.018 220.3)
#557C8B 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) | #747A8C | 0.040 |
| Deuteranopia (no green cones) | #6B748B | 0.035 |
| Tritanopia (no blue cones) | #418181 | 0.033 |
| Achromatopsia (no color) | #767676 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557C8B
#557C8B
oklch(56.3% 0.049 224)
- #8F6C5E
#8F6C5E
oklch(56.2% 0.05 42.8)
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 #557C8B, 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 0.028
- Battleship Grey #6B7C85 ΔE 0.028
- Metallic Blue #4F738E ΔE 0.031
- Cerulean #457B9D ΔE 0.033
- Battleship Gray #6C757D ΔE 0.035
- Slate Gray #708090 ΔE 0.038
- Steel Grey #6F828A ΔE 0.039
Use #557C8B 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.