#3F97CF
Closest named color: Dark Sky Blue (#448EE4). oklch(64.8% 0.118 240.2), rgb(63, 151, 207).
Aa
Black text reads best on this color (6.53:1).
About this color
#3F97CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.118 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.045 away. Black text reads best on it, at 6.53:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.53:1 |
| White text | 3.21:1 |
Values
| HEX | #3F97CF |
| RGB | rgb(63, 151, 207) |
| HSL | hsl(203, 60%, 53%) |
| OKLCH | oklch(64.8% 0.118 240.2) |
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 #3F97CF | 3.21:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #3F97CF | 6.53:1 | AA | Lc 45.0 | Large or bold text, headings |
| #3F97CF text on white | 3.21:1 | AA large text | Lc 59.0 | Large or bold text, headings |
| #3F97CF text on black | 6.53:1 | AA | Lc -42.7 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C7DDED
oklch(88.6% 0.032 239.4)
-
Step 300
300
#9FC6E3
oklch(80.8% 0.058 240.6)
-
Step 400
400
#69A8D5
oklch(70.7% 0.093 240.9)
-
Step 500
500 (this color)
#3F97CF
oklch(64.8% 0.118 240.2)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#104666
oklch(37.7% 0.077 240.2)
-
Step 950
950
#0C293C
oklch(26.9% 0.049 240.9)
#3F97CF 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) | #7D97D2 | 0.062 |
| Deuteranopia (no green cones) | #6989CE | 0.050 |
| Tritanopia (no blue cones) | #00A5AA | 0.082 |
| Achromatopsia (no color) | #909090 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F97CF
#3F97CF
oklch(64.8% 0.118 240.2)
- #C27C3C
#C27C3C
oklch(64.8% 0.118 60.6)
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 #3F97CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.045
- Faded Blue #658CBB ΔE 0.045
- Chefchaouen Blue #4895EF ΔE 0.051
- Water Blue #0E87CC ΔE 0.054
- Cool Blue #4984B8 ΔE 0.056
- Cornflower Blue #6495ED ΔE 0.059
- Blue NCS #118AB2 ΔE 0.061
- Dusty Blue #5A86AD ΔE 0.061
Use #3F97CF 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.