#3557B6
Closest named color: Mid Blue (#276AB3). oklch(48.6% 0.156 265.9), rgb(53, 87, 182).
Aa
White text reads best on this color (6.58:1).
About this color
#3557B6 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.156 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.052 away. White text reads best on it, at 6.58:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.19:1 |
| White text | 6.58:1 |
Values
| HEX | #3557B6 |
| RGB | rgb(53, 87, 182) |
| HSL | hsl(224, 55%, 46%) |
| OKLCH | oklch(48.6% 0.156 265.9) |
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 #3557B6 | 6.58:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #3557B6 | 3.19:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #3557B6 text on white | 6.58:1 | AA | Lc 82.2 | Fine for body text |
| #3557B6 text on black | 3.19:1 | AA large text | Lc -19.7 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#AAC0F2
oklch(80.9% 0.075 266.2)
-
Step 400
400
#7D9EEC
oklch(70.7% 0.121 265.9)
-
Step 500
500
#5D84E6
oklch(63.2% 0.154 265.8)
-
Step 600
600
#446BD4
oklch(55.6% 0.167 265.8)
-
Step 700
700 (this color)
#3557B6
oklch(48.6% 0.156 265.9)
-
Step 800
800
#2D4995
oklch(42.7% 0.129 265.9)
-
Step 900
900
#283E76
oklch(37.7% 0.1 265.7)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#3557B6 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) | #1963B9 | 0.034 |
| Deuteranopia (no green cones) | #0057B4 | 0.031 |
| Tritanopia (no blue cones) | #006E7E | 0.126 |
| Achromatopsia (no color) | #5D5D5D | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3557B6
#3557B6
oklch(48.6% 0.156 265.9)
- #785A00
#785A00
oklch(48.5% 0.099 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 #3557B6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.061
- Blue Blue #2242C7 ΔE 0.062
- French Blue #436BAD ΔE 0.063
- Warm Blue #4B57DB ΔE 0.064
- Iris #6258C4 ΔE 0.064
- Dusky Blue #475F94 ΔE 0.066
- Dusk Blue #26538D ΔE 0.069
Use #3557B6 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.