#3F9BEC
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.2% 0.148 248.6), rgb(63, 155, 236).
Aa
Black text reads best on this color (7.11:1).
About this color
#3F9BEC is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.148 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.018 away. Black text reads best on it, at 7.11:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.11:1 |
| White text | 2.95:1 |
Values
| HEX | #3F9BEC |
| RGB | rgb(63, 155, 236) |
| HSL | hsl(208, 82%, 59%) |
| OKLCH | oklch(67.2% 0.148 248.6) |
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 #3F9BEC | 2.95:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #3F9BEC | 7.11:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #3F9BEC text on white | 2.95:1 | Fails | Lc 55.7 | Large or bold text, headings |
| #3F9BEC text on black | 7.11:1 | AAA | Lc -46.1 | 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
#DDECFB
oklch(93.6% 0.026 248.1)
-
Step 200
200
#BFDDFA
oklch(88.5% 0.051 247.5)
-
Step 300
300
#91C6FA
oklch(80.9% 0.092 248.6)
-
Step 400
400 (this color)
#3F9BEC
oklch(67.2% 0.148 248.6)
-
Step 500
500
#008DEB
oklch(63% 0.172 248.6)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#004475
oklch(37.8% 0.103 248.3)
-
Step 950
950
#002848
oklch(27% 0.073 248.1)
#3F9BEC 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) | #769FEF | 0.053 |
| Deuteranopia (no green cones) | #5D8FEA | 0.036 |
| Tritanopia (no blue cones) | #00AEB8 | 0.109 |
| Achromatopsia (no color) | #969696 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9BEC
#3F9BEC
oklch(67.2% 0.148 248.6)
- #CF8200
#CF8200
oklch(67.2% 0.147 68.7)
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 #3F9BEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.018
- Cornflower Blue #6495ED ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.035
- Dodger Blue #1E90FF ΔE 0.048
- Soft Blue #6488EA ΔE 0.055
- Water Blue #0E87CC ΔE 0.075
- Faded Blue #658CBB ΔE 0.078
- Periwinkle Blue #8F99FB ΔE 0.086
Use #3F9BEC 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.