#3477DD
Closest named color: Royal Blue (#4169E1). oklch(58.1% 0.17 258.8), rgb(52, 119, 221).
Aa
Black text reads best on this color (4.82:1).
About this color
#3477DD is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.170 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.036 away. Black text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.82:1 |
| White text | 4.34:1 |
Values
| HEX | #3477DD |
| RGB | rgb(52, 119, 221) |
| HSL | hsl(216, 71%, 54%) |
| OKLCH | oklch(58.1% 0.17 258.8) |
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 #3477DD | 4.34:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #3477DD | 4.82:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #3477DD text on white | 4.34:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #3477DD text on black | 4.82:1 | AA | Lc -32.0 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F3
oklch(80.9% 0.077 259.4)
-
Step 400
400
#71A1EC
oklch(70.6% 0.122 259)
-
Step 500
500
#4A88E6
oklch(63.1% 0.156 258.6)
-
Step 600
600 (this color)
#3477DD
oklch(58.1% 0.17 258.8)
-
Step 700
700
#1F5CB8
oklch(49% 0.158 259)
-
Step 800
800
#1C4C95
oklch(42.7% 0.131 258.9)
-
Step 900
900
#1D4077
oklch(37.7% 0.102 259.2)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#3477DD 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) | #4081E1 | 0.030 |
| Deuteranopia (no green cones) | #1372DB | 0.024 |
| Tritanopia (no blue cones) | #008F9F | 0.132 |
| Achromatopsia (no color) | #797979 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3477DD
#3477DD
oklch(58.1% 0.17 258.8)
- #A07000
#A07000
oklch(58% 0.12 78.9)
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 #3477DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.036
- Cerulean Blue #056EEE ΔE 0.043
- Windows Blue #3778BF ΔE 0.047
- Clear Blue #247AFD ΔE 0.048
- Water Blue #0E87CC ΔE 0.055
- Neon Blue #4361EE ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.065
- Cornflower #6A79F7 ΔE 0.070
Use #3477DD 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.