#355FF9
Closest named color: Neon Blue (#4361EE). oklch(55.6% 0.234 266.5), rgb(53, 95, 249).
Aa
White text reads best on this color (5.05:1).
About this color
#355FF9 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.234 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.022 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.234) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #355FF9 |
| RGB | rgb(53, 95, 249) |
| HSL | hsl(227, 94%, 59%) |
| OKLCH | oklch(55.6% 0.234 266.5) |
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 #355FF9 | 5.05:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #355FF9 | 4.15:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #355FF9 text on white | 5.05:1 | AA | Lc 74.1 | Content text, not long reading |
| #355FF9 text on black | 4.15:1 | AA large text | Lc -27.6 | 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 600.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600 (this color)
#355FF9
oklch(55.6% 0.234 266.5)
-
Step 700
700
#294DD9
oklch(49.1% 0.217 266.5)
-
Step 800
800
#2240AF
oklch(42.6% 0.18 266.6)
-
Step 900
900
#1F388B
oklch(37.6% 0.141 266.6)
-
Step 950
950
#122251
oklch(27% 0.089 266.3)
#355FF9 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) | #0078FE | 0.057 |
| Deuteranopia (no green cones) | #0066F6 | 0.026 |
| Tritanopia (no blue cones) | #0087A3 | 0.181 |
| Achromatopsia (no color) | #6F6F6F | 0.234 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355FF9
#355FF9
oklch(55.6% 0.234 266.5)
- #906D00
#906D00
oklch(55.4% 0.113 86.3)
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 #355FF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.022
- Bright Blue #0165FC ΔE 0.024
- Azul #1D5DEC ΔE 0.028
- Cerulean Blue #056EEE ΔE 0.041
- Electric Blue #0652FF ΔE 0.042
- Royal Blue #4169E1 ΔE 0.046
- Warm Blue #4B57DB ΔE 0.052
- Clear Blue #247AFD ΔE 0.061
Use #355FF9 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.