#557DA9
Closest named color: Off Blue (#5684AE). oklch(57.9% 0.082 251.6), rgb(85, 125, 169).
Aa
Black text reads best on this color (4.89:1).
About this color
#557DA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.082 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.020 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 4.89:1 |
| White text | 4.29:1 |
Values
| HEX | #557DA9 |
| RGB | rgb(85, 125, 169) |
| HSL | hsl(211, 33%, 50%) |
| OKLCH | oklch(57.9% 0.082 251.6) |
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 #557DA9 | 4.29:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #557DA9 | 4.89:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #557DA9 text on white | 4.29:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #557DA9 text on black | 4.89:1 | AA | Lc -32.1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B0C3D8
oklch(80.9% 0.036 250.9)
-
Step 400
400
#86A4C5
oklch(70.8% 0.059 251.1)
-
Step 500
500
#688DB6
oklch(63.2% 0.075 251.6)
-
Step 600
600 (this color)
#557DA9
oklch(57.9% 0.082 251.6)
-
Step 700
700
#3F638B
oklch(49% 0.077 252)
-
Step 800
800
#345171
oklch(42.7% 0.064 251.8)
-
Step 900
900
#2E435B
oklch(37.6% 0.049 252.4)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#557DA9 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) | #6B7FAB | 0.029 |
| Deuteranopia (no green cones) | #6176A8 | 0.023 |
| Tritanopia (no blue cones) | #2E878C | 0.071 |
| Achromatopsia (no color) | #7A7A7A | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #557DA9
#557DA9
oklch(57.9% 0.082 251.6)
- #987241
#987241
oklch(57.9% 0.081 72.1)
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 #557DA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.020
- Stormy Blue #507B9C ΔE 0.021
- Steel Blue #4682B4 ΔE 0.022
- Dusty Blue #5A86AD ΔE 0.027
- Cerulean #457B9D ΔE 0.027
- Cool Blue #4984B8 ΔE 0.027
- Dull Blue #49759C ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.042
Use #557DA9 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.