#355FD9
Closest named color: Warm Blue (#4B57DB). oklch(52.9% 0.193 265.7), rgb(53, 95, 217).
Aa
White text reads best on this color (5.54:1).
About this color
#355FD9 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.193 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.027 away. White text reads best on it, at 5.54:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.79:1 |
| White text | 5.54:1 |
Values
| HEX | #355FD9 |
| RGB | rgb(53, 95, 217) |
| HSL | hsl(225, 68%, 53%) |
| OKLCH | oklch(52.9% 0.193 265.7) |
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 #355FD9 | 5.54:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #355FD9 | 3.79:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #355FD9 text on white | 5.54:1 | AA | Lc 77.1 | Fine for body text |
| #355FD9 text on black | 3.79:1 | AA large text | Lc -24.6 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A6C0FA
oklch(80.9% 0.087 265.8)
-
Step 400
400
#779DF7
oklch(70.7% 0.139 265.7)
-
Step 500
500
#5581F4
oklch(63% 0.179 265.8)
-
Step 600
600 (this color)
#355FD9
oklch(52.9% 0.193 265.7)
-
Step 700
700
#2F55C5
oklch(49.1% 0.18 265.7)
-
Step 800
800
#27469F
oklch(42.6% 0.149 265.8)
-
Step 900
900
#243C7E
oklch(37.6% 0.116 266)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#355FD9 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) | #0070DD | 0.044 |
| Deuteranopia (no green cones) | #0061D7 | 0.026 |
| Tritanopia (no blue cones) | #007D93 | 0.151 |
| Achromatopsia (no color) | #686868 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355FD9
#355FD9
oklch(52.9% 0.193 265.7)
- #876600
#876600
oklch(52.9% 0.108 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 #355FD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.027
- Royal Blue #4169E1 ΔE 0.031
- Azul #1D5DEC ΔE 0.034
- Neon Blue #4361EE ΔE 0.036
- Cerulean Blue #056EEE ΔE 0.048
- Bright Blue #0165FC ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.061
- Iris #6258C4 ΔE 0.063
Use #355FD9 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.