#3F99FC
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.7% 0.169 253.4), rgb(63, 153, 252).
Aa
Black text reads best on this color (7.17:1).
About this color
#3F99FC is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.169 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.020 away. Black text reads best on it, at 7.17:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.17:1 |
| White text | 2.92:1 |
Values
| HEX | #3F99FC |
| RGB | rgb(63, 153, 252) |
| HSL | hsl(211, 97%, 62%) |
| OKLCH | oklch(67.7% 0.169 253.4) |
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 #3F99FC | 2.92:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #3F99FC | 7.17:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #3F99FC text on white | 2.92:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #3F99FC text on black | 7.17:1 | AAA | Lc -46.5 | 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
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DCECFF
oklch(93.7% 0.031 252.7)
-
Step 200
200
#BFDCFF
oklch(88.5% 0.058 253.3)
-
Step 300
300
#94C4FF
oklch(80.8% 0.098 254)
-
Step 400
400 (this color)
#3F99FC
oklch(67.7% 0.169 253.4)
-
Step 500
500
#0089FC
oklch(63.2% 0.197 253.3)
-
Step 600
600
#0073D5
oklch(55.7% 0.173 253.3)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900
#00417E
oklch(37.7% 0.118 253.6)
-
Step 950
950
#00264E
oklch(27% 0.085 253.5)
#3F99FC 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) | #6AA0FF | 0.044 |
| Deuteranopia (no green cones) | #4B8FFA | 0.026 |
| Tritanopia (no blue cones) | #00B0BE | 0.128 |
| Achromatopsia (no color) | #979797 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F99FC
#3F99FC
oklch(67.7% 0.169 253.4)
- #CC8700
#CC8700
oklch(67.7% 0.144 73.2)
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 #3F99FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.020
- Dodger Blue #1E90FF ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.035
- Dark Sky Blue #448EE4 ΔE 0.042
- Soft Blue #6488EA ΔE 0.052
- Periwinkle Blue #8F99FB ΔE 0.081
- Cornflower #6A79F7 ΔE 0.083
- Lavender Blue #8B88F8 ΔE 0.083
Use #3F99FC 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.