#355CCF
Closest named color: Warm Blue (#4B57DB). oklch(51.5% 0.183 265.9), rgb(53, 92, 207).
Aa
White text reads best on this color (5.86:1).
About this color
#355CCF is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.183 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.032 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #355CCF |
| RGB | rgb(53, 92, 207) |
| HSL | hsl(225, 62%, 51%) |
| OKLCH | oklch(51.5% 0.183 265.9) |
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 #355CCF | 5.86:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #355CCF | 3.58:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #355CCF text on white | 5.86:1 | AA | Lc 78.8 | Fine for body text |
| #355CCF text on black | 3.58:1 | AA large text | Lc -23.0 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A6C0FB
oklch(81% 0.089 266)
-
Step 400
400
#779DF9
oklch(70.8% 0.142 265.9)
-
Step 500
500
#5581F6
oklch(63.2% 0.181 265.9)
-
Step 600
600
#3C67E5
oklch(55.7% 0.197 265.9)
-
Step 700
700 (this color)
#355CCF
oklch(51.5% 0.183 265.9)
-
Step 800
800
#2746A1
oklch(42.8% 0.152 265.9)
-
Step 900
900
#233C80
oklch(37.7% 0.119 265.7)
-
Step 950
950
#15244B
oklch(27.1% 0.075 265.8)
#355CCF 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) | #006CD3 | 0.042 |
| Deuteranopia (no green cones) | #005ECD | 0.027 |
| Tritanopia (no blue cones) | #00788C | 0.145 |
| Achromatopsia (no color) | #656565 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355CCF
#355CCF
oklch(51.5% 0.183 265.9)
- #826200
#826200
oklch(51.5% 0.105 86.2)
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 #355CCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.032
- Royal Blue #4169E1 ΔE 0.045
- Azul #1D5DEC ΔE 0.047
- Neon Blue #4361EE ΔE 0.052
- Iris #6258C4 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.061
- Cerulean Blue #056EEE ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.063
Use #355CCF 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.