#398CE4
Closest named color: Dark Sky Blue (#448EE4). oklch(63.2% 0.155 252.7), rgb(57, 140, 228).
Aa
Black text reads best on this color (6.04:1).
About this color
#398CE4 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.155 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.010 away. Black text reads best on it, at 6.04:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.04:1 |
| White text | 3.47:1 |
Values
| HEX | #398CE4 |
| RGB | rgb(57, 140, 228) |
| HSL | hsl(211, 76%, 56%) |
| OKLCH | oklch(63.2% 0.155 252.7) |
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 #398CE4 | 3.47:1 | AA large text | Lc -67.4 | Content text, not long reading |
| Black text on #398CE4 | 6.04:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #398CE4 text on white | 3.47:1 | AA large text | Lc 61.9 | Content text, not long reading |
| #398CE4 text on black | 6.04:1 | AA | Lc -39.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF5
oklch(88.4% 0.042 253.8)
-
Step 300
300
#9EC4F1
oklch(80.9% 0.076 253)
-
Step 400
400
#67A4EA
oklch(70.7% 0.121 252.9)
-
Step 500
500 (this color)
#398CE4
oklch(63.2% 0.155 252.7)
-
Step 600
600
#0473D2
oklch(55.5% 0.169 252.9)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#014F93
oklch(42.7% 0.13 252.7)
-
Step 900
900
#104275
oklch(37.6% 0.101 252.8)
-
Step 950
950
#0C2745
oklch(27% 0.065 253.3)
#398CE4 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) | #6292E8 | 0.042 |
| Deuteranopia (no green cones) | #4782E2 | 0.026 |
| Tritanopia (no blue cones) | #00A1AD | 0.117 |
| Achromatopsia (no color) | #8A8A8A | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #398CE4
#398CE4
oklch(63.2% 0.155 252.7)
- #BB7A00
#BB7A00
oklch(63.2% 0.135 72.2)
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 #398CE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.010
- Chefchaouen Blue #4895EF ΔE 0.031
- Dodger Blue #1E90FF ΔE 0.040
- Soft Blue #6488EA ΔE 0.041
- Water Blue #0E87CC ΔE 0.045
- Cornflower Blue #6495ED ΔE 0.050
- Cool Blue #4984B8 ΔE 0.066
- Clear Blue #247AFD ΔE 0.066
Use #398CE4 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.