#3FA9EF
Closest named color: Chefchaouen Blue (#4895EF). oklch(70.5% 0.14 241.9), rgb(63, 169, 239).
Aa
Black text reads best on this color (8.13:1).
About this color
#3FA9EF is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.140 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.054 away. Black text reads best on it, at 8.13:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 8.13:1 |
| White text | 2.58:1 |
Values
| HEX | #3FA9EF |
| RGB | rgb(63, 169, 239) |
| HSL | hsl(204, 85%, 59%) |
| OKLCH | oklch(70.5% 0.14 241.9) |
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 #3FA9EF | 2.58:1 | Fails | Lc -55.2 | Large or bold text, headings |
| Black text on #3FA9EF | 8.13:1 | AAA | Lc 53.9 | Large or bold text, headings |
| #3FA9EF text on white | 2.58:1 | Fails | Lc 50.1 | Large or bold text, headings |
| #3FA9EF text on black | 8.13:1 | AAA | Lc -51.8 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFA
oklch(93.5% 0.026 244.4)
-
Step 200
200
#BEDEF7
oklch(88.5% 0.048 241.7)
-
Step 300
300
#8DC8F5
oklch(80.9% 0.088 242)
-
Step 400
400 (this color)
#3FA9EF
oklch(70.5% 0.14 241.9)
-
Step 500
500
#0092DB
oklch(63.2% 0.149 241.7)
-
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
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#3FA9EF 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) | #89AAF2 | 0.068 |
| Deuteranopia (no green cones) | #709AEE | 0.053 |
| Tritanopia (no blue cones) | #00BAC2 | 0.095 |
| Achromatopsia (no color) | #A1A1A1 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3FA9EF
#3FA9EF
oklch(70.5% 0.14 241.9)
- #DD8A35
#DD8A35
oklch(70.6% 0.14 62.1)
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 #3FA9EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.056
- Deep Sky Blue #00BFFF ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.072
- Turquoise Blue #06B1C4 ΔE 0.078
- Dodger Blue #1E90FF ΔE 0.080
- Carolina Blue #8AB8FE ΔE 0.085
- Soft Blue #6488EA ΔE 0.088
Use #3FA9EF 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.