#3F9FF4
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.5% 0.154 248.9), rgb(63, 159, 244).
Aa
Black text reads best on this color (7.47:1).
About this color
#3F9FF4 is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.154 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.026 away. Black text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.47:1 |
| White text | 2.80:1 |
Values
| HEX | #3F9FF4 |
| RGB | rgb(63, 159, 244) |
| HSL | hsl(208, 89%, 60%) |
| OKLCH | oklch(68.5% 0.154 248.9) |
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 #3F9FF4 | 2.80:1 | Fails | Lc -58.9 | Large or bold text, headings |
| Black text on #3F9FF4 | 7.47:1 | AAA | Lc 50.4 | Large or bold text, headings |
| #3F9FF4 text on white | 2.80:1 | Fails | Lc 53.6 | Large or bold text, headings |
| #3F9FF4 text on black | 7.47:1 | AAA | Lc -48.2 | 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
#EFF6FE
oklch(97% 0.013 251.6)
-
Step 100
100
#DCECFC
oklch(93.6% 0.028 248.1)
-
Step 200
200
#BFDDFC
oklch(88.6% 0.054 249.3)
-
Step 300
300
#8FC6FC
oklch(80.9% 0.096 248.6)
-
Step 400
400 (this color)
#3F9FF4
oklch(68.5% 0.154 248.9)
-
Step 500
500
#008DEC
oklch(63.1% 0.173 248.9)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004375
oklch(37.5% 0.104 249)
-
Step 950
950
#002849
oklch(27.1% 0.074 248.8)
#3F9FF4 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) | #78A3F8 | 0.054 |
| Deuteranopia (no green cones) | #5D93F2 | 0.036 |
| Tritanopia (no blue cones) | #00B3BE | 0.113 |
| Achromatopsia (no color) | #9A9A9A | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9FF4
#3F9FF4
oklch(68.5% 0.154 248.9)
- #D48600
#D48600
oklch(68.5% 0.149 69.2)
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 #3F9FF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.026
- Cornflower Blue #6495ED ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.051
- Soft Blue #6488EA ΔE 0.062
- Periwinkle Blue #8F99FB ΔE 0.081
- Deep Sky Blue #00BFFF ΔE 0.084
- Perrywinkle #8F8CE7 ΔE 0.088
Use #3F9FF4 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.