#355ECF
Closest named color: Warm Blue (#4B57DB). oklch(51.9% 0.181 265.4), rgb(53, 94, 207).
Aa
White text reads best on this color (5.74:1).
About this color
#355ECF is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.181 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.033 away. White text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.65:1 |
| White text | 5.74:1 |
Values
| HEX | #355ECF |
| RGB | rgb(53, 94, 207) |
| HSL | hsl(224, 62%, 51%) |
| OKLCH | oklch(51.9% 0.181 265.4) |
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 #355ECF | 5.74:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #355ECF | 3.65:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #355ECF text on white | 5.74:1 | AA | Lc 78.3 | Fine for body text |
| #355ECF text on black | 3.65:1 | AA large text | Lc -23.5 | 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
#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
#A5C0FA
oklch(80.9% 0.088 265.1)
-
Step 400
400
#769DF8
oklch(70.7% 0.141 265.4)
-
Step 500
500
#5481F4
oklch(63% 0.179 265.5)
-
Step 600
600
#3B68E3
oklch(55.7% 0.194 265.3)
-
Step 700
700 (this color)
#355ECF
oklch(51.9% 0.181 265.4)
-
Step 800
800
#2646A0
oklch(42.6% 0.151 265.5)
-
Step 900
900
#233C7F
oklch(37.7% 0.118 265.6)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#355ECF 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) | #006DD3 | 0.040 |
| Deuteranopia (no green cones) | #005FCD | 0.027 |
| Tritanopia (no blue cones) | #007A8D | 0.144 |
| Achromatopsia (no color) | #666666 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355ECF
#355ECF
oklch(51.9% 0.181 265.4)
- #846300
#846300
oklch(51.9% 0.106 85.7)
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 #355ECF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.033
- Royal Blue #4169E1 ΔE 0.041
- Azul #1D5DEC ΔE 0.047
- Neon Blue #4361EE ΔE 0.051
- Iris #6258C4 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.061
Use #355ECF 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.