#355F99
Closest named color: Denim Blue (#3B5B92). oklch(48.4% 0.105 256.9), rgb(53, 95, 153).
Aa
White text reads best on this color (6.46:1).
About this color
#355F99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.105 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.015 away. White text reads best on it, at 6.46:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.24:1 |
| White text | 6.46:1 |
Values
| HEX | #355F99 |
| RGB | rgb(53, 95, 153) |
| HSL | hsl(215, 49%, 40%) |
| OKLCH | oklch(48.4% 0.105 256.9) |
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 #355F99 | 6.46:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #355F99 | 3.24:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #355F99 text on white | 6.46:1 | AA | Lc 81.9 | Fine for body text |
| #355F99 text on black | 3.24:1 | AA large text | Lc -20.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ACC2E2
oklch(80.8% 0.051 257.7)
-
Step 400
400
#80A3D3
oklch(70.8% 0.081 256.4)
-
Step 500
500
#5F8BC8
oklch(63.1% 0.105 256.7)
-
Step 600
600
#4674B4
oklch(55.6% 0.112 256.9)
-
Step 700
700 (this color)
#355F99
oklch(48.4% 0.105 256.9)
-
Step 800
800
#2E4F7E
oklch(42.6% 0.088 257.4)
-
Step 900
900
#294265
oklch(37.6% 0.068 257)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#355F99 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) | #46639B | 0.024 |
| Deuteranopia (no green cones) | #385A98 | 0.014 |
| Tritanopia (no blue cones) | #006C74 | 0.086 |
| Achromatopsia (no color) | #5E5E5E | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355F99
#355F99
oklch(48.4% 0.105 256.9)
- #7E5600
#7E5600
oklch(48.4% 0.101 77.5)
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 #355F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.015
- Dusky Blue #475F94 ΔE 0.021
- Denim #3B638C ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.031
- Peacock Blue #016795 ΔE 0.035
- Dusk Blue #26538D ΔE 0.043
- Mid Blue #276AB3 ΔE 0.047
- French Blue #436BAD ΔE 0.048
Use #355F99 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.