#398BDF
Closest named color: Dark Sky Blue (#448EE4). oklch(62.7% 0.149 251.9), rgb(57, 139, 223).
Aa
Black text reads best on this color (5.93:1).
About this color
#398BDF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.149 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.014 away. Black text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.93:1 |
| White text | 3.53:1 |
Values
| HEX | #398BDF |
| RGB | rgb(57, 139, 223) |
| HSL | hsl(210, 72%, 55%) |
| OKLCH | oklch(62.7% 0.149 251.9) |
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 #398BDF | 3.53:1 | AA large text | Lc -68.1 | Content text, not long reading |
| Black text on #398BDF | 5.93:1 | AA | Lc 41.5 | Non-text elements, placeholder text |
| #398BDF text on white | 3.53:1 | AA large text | Lc 62.6 | Content text, not long reading |
| #398BDF text on black | 5.93:1 | AA | Lc -39.1 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9FC4EF
oklch(80.9% 0.073 252.5)
-
Step 400
400
#68A5E7
oklch(70.8% 0.116 251.5)
-
Step 500
500 (this color)
#398BDF
oklch(62.7% 0.149 251.9)
-
Step 600
600
#0974CE
oklch(55.5% 0.163 252)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#045090
oklch(42.8% 0.124 251.6)
-
Step 900
900
#114373
oklch(37.8% 0.097 251.5)
-
Step 950
950
#0C2743
oklch(26.8% 0.062 251.9)
#398BDF 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) | #6490E2 | 0.043 |
| Deuteranopia (no green cones) | #4A81DD | 0.027 |
| Tritanopia (no blue cones) | #009FAA | 0.113 |
| Achromatopsia (no color) | #888888 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #398BDF
#398BDF
oklch(62.7% 0.149 251.9)
- #B97800
#B97800
oklch(62.6% 0.134 71.8)
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 #398BDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.014
- Chefchaouen Blue #4895EF ΔE 0.037
- Water Blue #0E87CC ΔE 0.038
- Soft Blue #6488EA ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.054
- Cool Blue #4984B8 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.065
Use #398BDF 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.