#3F97D3
Closest named color: Dark Sky Blue (#448EE4). oklch(65% 0.123 242), rgb(63, 151, 211).
Aa
Black text reads best on this color (6.57:1).
About this color
#3F97D3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.123 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.040 away. Black text reads best on it, at 6.57:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.57:1 |
| White text | 3.19:1 |
Values
| HEX | #3F97D3 |
| RGB | rgb(63, 151, 211) |
| HSL | hsl(204, 63%, 54%) |
| OKLCH | oklch(65% 0.123 242) |
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 #3F97D3 | 3.19:1 | AA large text | Lc -64.2 | Content text, not long reading |
| Black text on #3F97D3 | 6.57:1 | AA | Lc 45.3 | Large or bold text, headings |
| #3F97D3 text on white | 3.19:1 | AA large text | Lc 58.8 | Large or bold text, headings |
| #3F97D3 text on black | 6.57:1 | AA | Lc -42.9 | 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
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#9FC6E5
oklch(80.9% 0.061 242.5)
-
Step 400
400
#68A8D7
oklch(70.7% 0.095 241.7)
-
Step 500
500 (this color)
#3F97D3
oklch(65% 0.123 242)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#0F4668
oklch(37.8% 0.08 241.5)
-
Step 950
950
#0C293D
oklch(27% 0.051 242.2)
#3F97D3 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) | #7C98D6 | 0.061 |
| Deuteranopia (no green cones) | #678AD2 | 0.047 |
| Tritanopia (no blue cones) | #00A6AC | 0.086 |
| Achromatopsia (no color) | #909090 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F97D3
#3F97D3
oklch(65% 0.123 242)
- #C47C36
#C47C36
oklch(65% 0.123 61.6)
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 #3F97D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.040
- Chefchaouen Blue #4895EF ΔE 0.045
- Faded Blue #658CBB ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.054
- Water Blue #0E87CC ΔE 0.054
- Cool Blue #4984B8 ΔE 0.059
- Blue NCS #118AB2 ΔE 0.065
- Dusty Blue #5A86AD ΔE 0.065
Use #3F97D3 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.