#3181D3
Closest named color: Water Blue (#0E87CC). oklch(59.5% 0.147 252.2), rgb(49, 129, 211).
Aa
Black text reads best on this color (5.21:1).
About this color
#3181D3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.147 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.025 away. Black text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #3181D3 |
| RGB | rgb(49, 129, 211) |
| HSL | hsl(210, 65%, 51%) |
| OKLCH | oklch(59.5% 0.147 252.2) |
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 #3181D3 | 4.02:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #3181D3 | 5.21:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #3181D3 text on white | 4.02:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #3181D3 text on black | 5.21:1 | AA | Lc -34.5 | 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 500.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#9FC4EE
oklch(80.8% 0.072 251.9)
-
Step 400
400
#69A4E6
oklch(70.6% 0.115 252.2)
-
Step 500
500 (this color)
#3181D3
oklch(59.5% 0.147 252.2)
-
Step 600
600
#1274CD
oklch(55.6% 0.16 252.3)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#08508F
oklch(42.8% 0.122 251.8)
-
Step 900
900
#134372
oklch(37.7% 0.095 251.6)
-
Step 950
950
#0D2743
oklch(26.9% 0.061 252.5)
#3181D3 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) | #5A87D6 | 0.042 |
| Deuteranopia (no green cones) | #4078D1 | 0.024 |
| Tritanopia (no blue cones) | #0094A0 | 0.109 |
| Achromatopsia (no color) | #7F7F7F | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3181D3
#3181D3
oklch(59.5% 0.147 252.2)
- #AD7000
#AD7000
oklch(59.6% 0.128 71.8)
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 #3181D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.025
- Windows Blue #3778BF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.045
- Cool Blue #4984B8 ΔE 0.047
- Steel Blue #4682B4 ΔE 0.050
- Nice Blue #107AB0 ΔE 0.060
- Soft Blue #6488EA ΔE 0.064
- Blue NCS #118AB2 ΔE 0.064
Use #3181D3 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.