#55819D
Closest named color: Stormy Blue (#507B9C). oklch(58.2% 0.065 237.3), rgb(85, 129, 157).
Aa
Black text reads best on this color (5.01:1).
About this color
#55819D is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.065 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.019 away. Black text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 5.01:1 |
| White text | 4.18:1 |
Values
| HEX | #55819D |
| RGB | rgb(85, 129, 157) |
| HSL | hsl(203, 30%, 47%) |
| OKLCH | oklch(58.2% 0.065 237.3) |
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 #55819D | 4.18:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #55819D | 5.01:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #55819D text on white | 4.18:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #55819D text on black | 5.01:1 | AA | Lc -32.9 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B0C4D1
oklch(80.9% 0.029 236.3)
-
Step 400
400
#86A5BB
oklch(70.6% 0.047 239.2)
-
Step 500
500
#678FA9
oklch(63% 0.059 237.4)
-
Step 600
600 (this color)
#55819D
oklch(58.2% 0.065 237.3)
-
Step 700
700
#3E667F
oklch(49.1% 0.06 237.2)
-
Step 800
800
#345367
oklch(42.7% 0.05 237.8)
-
Step 900
900
#2D4554
oklch(37.7% 0.039 236.7)
-
Step 950
950
#1B2831
oklch(26.9% 0.025 239.1)
#55819D 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) | #74809E | 0.039 |
| Deuteranopia (no green cones) | #6A789D | 0.034 |
| Tritanopia (no blue cones) | #36888A | 0.051 |
| Achromatopsia (no color) | #7C7C7C | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55819D
#55819D
oklch(58.2% 0.065 237.3)
- #997155
#997155
oklch(58.2% 0.065 56)
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 #55819D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.019
- Off Blue #5684AE ΔE 0.026
- Cerulean #457B9D ΔE 0.026
- Grey Blue #647D8E ΔE 0.026
- Dusty Blue #5A86AD ΔE 0.027
- Slate Gray #708090 ΔE 0.036
- Steel Blue #4682B4 ΔE 0.037
- Dull Blue #49759C ΔE 0.039
Use #55819D 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.