#3F81CF
Closest named color: Water Blue (#0E87CC). oklch(59.8% 0.137 254.2), rgb(63, 129, 207).
Aa
Black text reads best on this color (5.25:1).
About this color
#3F81CF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.137 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.028 away. Black text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.25:1 |
| White text | 3.99:1 |
Values
| HEX | #3F81CF |
| RGB | rgb(63, 129, 207) |
| HSL | hsl(213, 60%, 53%) |
| OKLCH | oklch(59.8% 0.137 254.2) |
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 #3F81CF | 3.99:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #3F81CF | 5.25:1 | AA | Lc 37.1 | Non-text elements, placeholder text |
| #3F81CF text on white | 3.99:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #3F81CF text on black | 5.25:1 | AA | Lc -34.7 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A3C4EC
oklch(81% 0.067 253.5)
-
Step 400
400
#71A4E2
oklch(70.8% 0.106 253.9)
-
Step 500
500 (this color)
#3F81CF
oklch(59.8% 0.137 254.2)
-
Step 600
600
#2974C8
oklch(55.7% 0.149 254.1)
-
Step 700
700
#1B61AD
oklch(49.2% 0.139 254.1)
-
Step 800
800
#194F8C
oklch(42.7% 0.115 254.3)
-
Step 900
900
#1C4270
oklch(37.7% 0.09 254.8)
-
Step 950
950
#112741
oklch(26.9% 0.056 253.9)
#3F81CF 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) | #5E86D2 | 0.035 |
| Deuteranopia (no green cones) | #4879CD | 0.021 |
| Tritanopia (no blue cones) | #00939E | 0.107 |
| Achromatopsia (no color) | #7F7F7F | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F81CF
#3F81CF
oklch(59.8% 0.137 254.2)
- #AB7200
#AB7200
oklch(59.7% 0.126 74.4)
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 #3F81CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.028
- Windows Blue #3778BF ΔE 0.034
- Cool Blue #4984B8 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.044
- Off Blue #5684AE ΔE 0.057
- Nice Blue #107AB0 ΔE 0.060
- Soft Blue #6488EA ΔE 0.060
Use #3F81CF 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.