#339CDF
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.4% 0.136 241.7), rgb(51, 156, 223).
Aa
Black text reads best on this color (6.96:1).
About this color
#339CDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.136 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.036 away. Black text reads best on it, at 6.96:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.96:1 |
| White text | 3.01:1 |
Values
| HEX | #339CDF |
| RGB | rgb(51, 156, 223) |
| HSL | hsl(203, 73%, 54%) |
| OKLCH | oklch(66.4% 0.136 241.7) |
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 #339CDF | 3.01:1 | AA large text | Lc -61.8 | Content text, not long reading |
| Black text on #339CDF | 6.96:1 | AA | Lc 47.6 | Large or bold text, headings |
| #339CDF text on white | 3.01:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #339CDF text on black | 6.96:1 | AA | Lc -45.3 | 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 500.
-
Step 50
50
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9BC7E8
oklch(81% 0.066 241)
-
Step 400
400
#5FA9DD
oklch(70.8% 0.106 241.1)
-
Step 500
500 (this color)
#339CDF
oklch(66.4% 0.136 241.7)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#07293F
oklch(26.9% 0.056 241.9)
#339CDF 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) | #7D9DE2 | 0.067 |
| Deuteranopia (no green cones) | #658DDE | 0.052 |
| Tritanopia (no blue cones) | #00ADB4 | 0.093 |
| Achromatopsia (no color) | #949494 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #339CDF
#339CDF
oklch(66.4% 0.136 241.7)
- #CE7E2A
#CE7E2A
oklch(66.5% 0.136 62)
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 #339CDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.041
- Cornflower Blue #6495ED ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.064
- Water Blue #0E87CC ΔE 0.066
- Faded Blue #658CBB ΔE 0.067
- Soft Blue #6488EA ΔE 0.067
- Cool Blue #4984B8 ΔE 0.078
Use #339CDF 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.