#355BCB
Closest named color: Warm Blue (#4B57DB). oklch(51% 0.179 266), rgb(53, 91, 203).
Aa
White text reads best on this color (5.98:1).
About this color
#355BCB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.179 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.036 away. White text reads best on it, at 5.98:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.51:1 |
| White text | 5.98:1 |
Values
| HEX | #355BCB |
| RGB | rgb(53, 91, 203) |
| HSL | hsl(225, 59%, 50%) |
| OKLCH | oklch(51% 0.179 266) |
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 #355BCB | 5.98:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #355BCB | 3.51:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #355BCB text on white | 5.98:1 | AA | Lc 79.4 | Fine for body text |
| #355BCB text on black | 3.51:1 | AA large text | Lc -22.4 | 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
#A6C0FA
oklch(80.9% 0.087 265.8)
-
Step 400
400
#789DF7
oklch(70.8% 0.139 266)
-
Step 500
500
#5681F3
oklch(63% 0.177 266)
-
Step 600
600
#3D67E2
oklch(55.5% 0.193 266)
-
Step 700
700 (this color)
#355BCB
oklch(51% 0.179 266)
-
Step 800
800
#28469F
oklch(42.6% 0.149 266.1)
-
Step 900
900
#243C7E
oklch(37.6% 0.116 266)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#355BCB 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) | #006BCF | 0.043 |
| Deuteranopia (no green cones) | #005DC9 | 0.028 |
| Tritanopia (no blue cones) | #00768A | 0.141 |
| Achromatopsia (no color) | #636363 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #355BCB
#355BCB
oklch(51% 0.179 266)
- #816100
#816100
oklch(51.1% 0.105 86)
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 #355BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.036
- Royal Blue #4169E1 ΔE 0.051
- Azul #1D5DEC ΔE 0.052
- Iris #6258C4 ΔE 0.057
- Mid Blue #276AB3 ΔE 0.058
- Neon Blue #4361EE ΔE 0.058
- Blue Blue #2242C7 ΔE 0.065
- Dark Periwinkle #665FD1 ΔE 0.065
Use #355BCB 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.