#3B9DFD
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.5% 0.168 251.4), rgb(59, 157, 253).
Aa
Black text reads best on this color (7.42:1).
About this color
#3B9DFD is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.168 and its hue 251°. 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 7.42:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.42:1 |
| White text | 2.82:1 |
Values
| HEX | #3B9DFD |
| RGB | rgb(59, 157, 253) |
| HSL | hsl(210, 98%, 61%) |
| OKLCH | oklch(68.5% 0.168 251.4) |
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 #3B9DFD | 2.82:1 | Fails | Lc -59.1 | Large or bold text, headings |
| Black text on #3B9DFD | 7.42:1 | AAA | Lc 50.2 | Large or bold text, headings |
| #3B9DFD text on white | 2.82:1 | Fails | Lc 53.9 | Large or bold text, headings |
| #3B9DFD text on black | 7.42:1 | AAA | Lc -48.0 | 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
#DCECFE
oklch(93.7% 0.03 251.3)
-
Step 200
200
#BEDDFF
oklch(88.6% 0.058 250.9)
-
Step 300
300
#91C5FF
oklch(80.9% 0.099 251.8)
-
Step 400
400 (this color)
#3B9DFD
oklch(68.5% 0.168 251.4)
-
Step 500
500
#008BF4
oklch(63.1% 0.185 251.3)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#00427A
oklch(37.7% 0.112 251.7)
-
Step 950
950
#00274B
oklch(27% 0.079 251.1)
#3B9DFD 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) | #6FA3FF | 0.049 |
| Deuteranopia (no green cones) | #5192FB | 0.030 |
| Tritanopia (no blue cones) | #00B4C1 | 0.125 |
| Achromatopsia (no color) | #9A9A9A | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B9DFD
#3B9DFD
oklch(68.5% 0.168 251.4)
- #D18800
#D18800
oklch(68.5% 0.147 71.7)
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 #3B9DFD, 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 0.039
- Dodger Blue #1E90FF ΔE 0.040
- Dark Sky Blue #448EE4 ΔE 0.049
- Soft Blue #6488EA ΔE 0.060
- Periwinkle Blue #8F99FB ΔE 0.081
- Lavender Blue #8B88F8 ΔE 0.089
- Deep Sky Blue #00BFFF ΔE 0.090
Use #3B9DFD 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.