#339BFB
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.7% 0.17 250.6), rgb(51, 155, 251).
Aa
Black text reads best on this color (7.22:1).
About this color
#339BFB is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.170 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.023 away. Black text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.22:1 |
| White text | 2.90:1 |
Values
| HEX | #339BFB |
| RGB | rgb(51, 155, 251) |
| HSL | hsl(209, 96%, 59%) |
| OKLCH | oklch(67.7% 0.17 250.6) |
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 #339BFB | 2.90:1 | Fails | Lc -60.3 | Content text, not long reading |
| Black text on #339BFB | 7.22:1 | AAA | Lc 49.1 | Large or bold text, headings |
| #339BFB text on white | 2.90:1 | Fails | Lc 55.0 | Large or bold text, headings |
| #339BFB text on black | 7.22:1 | AAA | Lc -46.9 | 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
#DBECFE
oklch(93.6% 0.03 249.7)
-
Step 200
200
#BDDDFF
oklch(88.5% 0.058 250.1)
-
Step 300
300
#8FC6FF
oklch(81% 0.099 250)
-
Step 400
400 (this color)
#339BFB
oklch(67.7% 0.17 250.6)
-
Step 500
500
#008CF2
oklch(63.2% 0.182 250.6)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#004378
oklch(37.8% 0.108 250.3)
-
Step 950
950
#00274A
oklch(26.9% 0.077 250.5)
#339BFB 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) | #6DA1FF | 0.052 |
| Deuteranopia (no green cones) | #4D8FF9 | 0.033 |
| Tritanopia (no blue cones) | #00B2BF | 0.125 |
| Achromatopsia (no color) | #979797 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #339BFB
#339BFB
oklch(67.7% 0.17 250.6)
- #CF8500
#CF8500
oklch(67.7% 0.146 70.6)
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 #339BFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.023
- Dodger Blue #1E90FF ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.043
- Soft Blue #6488EA ΔE 0.058
- Water Blue #0E87CC ΔE 0.087
- Periwinkle Blue #8F99FB ΔE 0.087
- Clear Blue #247AFD ΔE 0.088
Use #339BFB 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.