#355366
Closest named color: YInMn Blue (#415A77). oklch(42.7% 0.048 237.2), rgb(53, 83, 102).
Aa
White text reads best on this color (8.13:1).
About this color
#355366 is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.048 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.037 away. White text reads best on it, at 8.13:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #355366 |
| RGB | rgb(53, 83, 102) |
| HSL | hsl(203, 32%, 30%) |
| OKLCH | oklch(42.7% 0.048 237.2) |
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 #355366 | 8.13:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #355366 | 2.58:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #355366 text on white | 8.13:1 | AAA | Lc 88.1 | Fine for body text |
| #355366 text on black | 2.58:1 | Fails | Lc -14.1 | Not readable |
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 800.
-
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
#D0DBE2
oklch(88.5% 0.015 235.4)
-
Step 300
300
#B1C4D1
oklch(81% 0.028 237.7)
-
Step 400
400
#87A5B9
oklch(70.6% 0.044 237.4)
-
Step 500
500
#688FA8
oklch(63.1% 0.057 237)
-
Step 600
600
#4F7993
oklch(55.6% 0.062 236.6)
-
Step 700
700
#40667E
oklch(49.2% 0.058 237.3)
-
Step 800
800 (this color)
#355366
oklch(42.7% 0.048 237.2)
-
Step 900
900
#2E4553
oklch(37.7% 0.037 235.8)
-
Step 950
950
#1B2831
oklch(26.9% 0.025 239.1)
#355366 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) | #4A5267 | 0.028 |
| Deuteranopia (no green cones) | #444D66 | 0.026 |
| Tritanopia (no blue cones) | #205859 | 0.038 |
| Achromatopsia (no color) | #4F4F4F | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355366
#355366
oklch(42.7% 0.048 237.2)
- #634835
#634835
oklch(42.6% 0.047 56.2)
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 #355366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.040
- Deep Teal #00555A ΔE 0.045
- Petrol #005F6A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal #264653 ΔE 0.052
- Dusty Grape #545775 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.055
Use #355366 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.