#557D91
Closest named color: Grey Blue (#647D8E). oklch(56.8% 0.054 230.6), rgb(85, 125, 145).
Aa
Black text reads best on this color (4.72:1).
About this color
#557D91 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.054 and its hue 231°. 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 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #557D91 |
| RGB | rgb(85, 125, 145) |
| HSL | hsl(200, 26%, 45%) |
| OKLCH | oklch(56.8% 0.054 230.6) |
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 #557D91 | 4.44:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #557D91 | 4.72:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #557D91 text on white | 4.44:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #557D91 text on black | 4.72:1 | AA | Lc -30.9 | 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
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B1C4CE
oklch(80.9% 0.025 230.5)
-
Step 400
400
#89A6B5
oklch(70.8% 0.039 230.5)
-
Step 500
500
#6A90A2
oklch(63.2% 0.05 228.8)
-
Step 600
600 (this color)
#557D91
oklch(56.8% 0.054 230.6)
-
Step 700
700
#426678
oklch(49% 0.05 230.8)
-
Step 800
800
#375362
oklch(42.6% 0.042 232.4)
-
Step 900
900
#304550
oklch(37.7% 0.032 231.5)
-
Step 950
950
#1C282F
oklch(26.9% 0.021 234.2)
#557D91 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) | #737B92 | 0.039 |
| Deuteranopia (no green cones) | #6A7591 | 0.033 |
| Tritanopia (no blue cones) | #3E8383 | 0.040 |
| Achromatopsia (no color) | #787878 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557D91
#557D91
oklch(56.8% 0.054 230.6)
- #916E5A
#916E5A
oklch(56.8% 0.054 51)
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 #557D91, 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 0.021
- Cerulean #457B9D ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.031
- Metallic Blue #4F738E ΔE 0.031
- Slate Gray #708090 ΔE 0.036
- Dull Blue #49759C ΔE 0.037
- Steel Grey #6F828A ΔE 0.039
Use #557D91 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.