#3557B0
Closest named color: Mid Blue (#276AB3). oklch(48.1% 0.147 265.5), rgb(53, 87, 176).
Aa
White text reads best on this color (6.68:1).
About this color
#3557B0 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.147 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.051 away. White text reads best on it, at 6.68:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #3557B0 |
| RGB | rgb(53, 87, 176) |
| HSL | hsl(223, 54%, 45%) |
| OKLCH | oklch(48.1% 0.147 265.5) |
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 #3557B0 | 6.68:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #3557B0 | 3.14:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #3557B0 text on white | 6.68:1 | AA | Lc 82.6 | Fine for body text |
| #3557B0 text on black | 3.14:1 | AA large text | Lc -19.3 | 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
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ABC0F0
oklch(80.9% 0.072 266.3)
-
Step 400
400
#7E9FE8
oklch(70.8% 0.114 265.1)
-
Step 500
500
#5E85E1
oklch(63.1% 0.145 265.2)
-
Step 600
600
#466CCF
oklch(55.5% 0.159 265.7)
-
Step 700
700 (this color)
#3557B0
oklch(48.1% 0.147 265.5)
-
Step 800
800
#2E4A91
oklch(42.7% 0.122 265.4)
-
Step 900
900
#293E74
oklch(37.6% 0.096 266)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#3557B0 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) | #2362B3 | 0.030 |
| Deuteranopia (no green cones) | #0057AE | 0.032 |
| Tritanopia (no blue cones) | #006C7B | 0.120 |
| Achromatopsia (no color) | #5C5C5C | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3557B0
#3557B0
oklch(48.1% 0.147 265.5)
- #775900
#775900
oklch(48.2% 0.099 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 #3557B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.058
- Dusk Blue #26538D ΔE 0.060
- French Blue #436BAD ΔE 0.060
- Twilight #4E518B ΔE 0.065
- Blueberry #464196 ΔE 0.067
- Blue Blue #2242C7 ΔE 0.068
Use #3557B0 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.