#3398CE
Closest named color: Dark Sky Blue (#448EE4). oklch(64.6% 0.121 236.8), rgb(51, 152, 206).
Aa
Black text reads best on this color (6.52:1).
About this color
#3398CE is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.121 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.049 away. Black text reads best on it, at 6.52:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.52:1 |
| White text | 3.21:1 |
Values
| HEX | #3398CE |
| RGB | rgb(51, 152, 206) |
| HSL | hsl(201, 61%, 50%) |
| OKLCH | oklch(64.6% 0.121 236.8) |
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 #3398CE | 3.21:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #3398CE | 6.52:1 | AA | Lc 45.0 | Non-text elements, placeholder text |
| #3398CE text on white | 3.21:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #3398CE text on black | 6.52:1 | AA | Lc -42.7 | Non-text elements, placeholder text |
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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDED
oklch(88.5% 0.033 238.2)
-
Step 300
300
#9DC7E2
oklch(80.9% 0.059 236.7)
-
Step 400
400
#63AAD4
oklch(70.8% 0.094 236.2)
-
Step 500
500 (this color)
#3398CE
oklch(64.6% 0.121 236.8)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#064766
oklch(37.7% 0.079 236.9)
-
Step 950
950
#092A3C
oklch(27.1% 0.05 237)
#3398CE 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) | #7E98D0 | 0.070 |
| Deuteranopia (no green cones) | #6989CD | 0.057 |
| Tritanopia (no blue cones) | #00A6AB | 0.078 |
| Achromatopsia (no color) | #8F8F8F | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3398CE
#3398CE
oklch(64.6% 0.121 236.8)
- #C5793D
#C5793D
oklch(64.6% 0.121 56.6)
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 #3398CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.049
- Faded Blue #658CBB ΔE 0.050
- Water Blue #0E87CC ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.056
- Blue NCS #118AB2 ΔE 0.058
- Cool Blue #4984B8 ΔE 0.058
- Dusty Blue #5A86AD ΔE 0.063
- Steel Blue #4682B4 ΔE 0.064
Use #3398CE 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.