#355CB3
Closest named color: Mid Blue (#276AB3). oklch(49.4% 0.145 263.8), rgb(53, 92, 179).
Aa
White text reads best on this color (6.30:1).
About this color
#355CB3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.145 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.038 away. White text reads best on it, at 6.30:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.33:1 |
| White text | 6.30:1 |
Values
| HEX | #355CB3 |
| RGB | rgb(53, 92, 179) |
| HSL | hsl(221, 54%, 45%) |
| OKLCH | oklch(49.4% 0.145 263.8) |
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 #355CB3 | 6.30:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #355CB3 | 3.33:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #355CB3 text on white | 6.30:1 | AA | Lc 81.0 | Fine for body text |
| #355CB3 text on black | 3.33:1 | AA large text | Lc -20.8 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#A9C1EF
oklch(80.9% 0.07 263.3)
-
Step 400
400
#7C9FE7
oklch(70.6% 0.113 263.9)
-
Step 500
500
#5C86E0
oklch(63.2% 0.144 263.9)
-
Step 600
600
#426ECE
oklch(55.7% 0.156 263.6)
-
Step 700
700 (this color)
#355CB3
oklch(49.4% 0.145 263.8)
-
Step 800
800
#2C4B90
oklch(42.8% 0.12 263.9)
-
Step 900
900
#273F73
oklch(37.7% 0.094 263.8)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#355CB3 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) | #2D66B6 | 0.026 |
| Deuteranopia (no green cones) | #085AB1 | 0.030 |
| Tritanopia (no blue cones) | #00707F | 0.116 |
| Achromatopsia (no color) | #606060 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355CB3
#355CB3
oklch(49.4% 0.145 263.8)
- #7D5B00
#7D5B00
oklch(49.4% 0.101 83.2)
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 #355CB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.038
- French Blue #436BAD ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.053
- Dusky Blue #475F94 ΔE 0.055
- Iris #6258C4 ΔE 0.065
- Dusk Blue #26538D ΔE 0.067
- Peacock Blue #016795 ΔE 0.068
- Warm Blue #4B57DB ΔE 0.069
Use #355CB3 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.