#3557CC
Closest named color: Warm Blue (#4B57DB). oklch(50.3% 0.186 267), rgb(53, 87, 204).
Aa
White text reads best on this color (6.20:1).
About this color
#3557CC is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.186 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.035 away. White text reads best on it, at 6.20:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.38:1 |
| White text | 6.20:1 |
Values
| HEX | #3557CC |
| RGB | rgb(53, 87, 204) |
| HSL | hsl(226, 60%, 50%) |
| OKLCH | oklch(50.3% 0.186 267) |
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 #3557CC | 6.20:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #3557CC | 3.38:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #3557CC text on white | 6.20:1 | AA | Lc 80.4 | Fine for body text |
| #3557CC text on black | 3.38:1 | AA large text | Lc -21.5 | 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
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A7BFFC
oklch(80.9% 0.091 267.7)
-
Step 400
400
#789CFA
oklch(70.7% 0.144 266.9)
-
Step 500
500
#5880F7
oklch(63.2% 0.183 267.1)
-
Step 600
600
#3F65E6
oklch(55.5% 0.2 267.1)
-
Step 700
700 (this color)
#3557CC
oklch(50.3% 0.186 267)
-
Step 800
800
#2945A2
oklch(42.7% 0.154 266.9)
-
Step 900
900
#253B80
oklch(37.6% 0.12 267.1)
-
Step 950
950
#16234B
oklch(26.9% 0.076 267.6)
#3557CC 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) | #0068D0 | 0.045 |
| Deuteranopia (no green cones) | #005ACA | 0.029 |
| Tritanopia (no blue cones) | #007489 | 0.147 |
| Achromatopsia (no color) | #616161 | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3557CC
#3557CC
oklch(50.3% 0.186 267)
- #7D5F00
#7D5F00
oklch(50.2% 0.103 87)
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 #3557CC, closest first.
No curated palette has a color within ΔE 0.04 of #3557CC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.035
- Azul #1D5DEC ΔE 0.052
- Blue Blue #2242C7 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.057
- Iris #6258C4 ΔE 0.060
- Neon Blue #4361EE ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
- Mid Blue #276AB3 ΔE 0.066
Use #3557CC 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.