#398DDB
Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.143 249.8), rgb(57, 141, 219).
Aa
Black text reads best on this color (6.00:1).
About this color
#398DDB is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.143 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.017 away. Black text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.00:1 |
| White text | 3.49:1 |
Values
| HEX | #398DDB |
| RGB | rgb(57, 141, 219) |
| HSL | hsl(209, 69%, 54%) |
| OKLCH | oklch(62.9% 0.143 249.8) |
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 #398DDB | 3.49:1 | AA large text | Lc -67.6 | Content text, not long reading |
| Black text on #398DDB | 6.00:1 | AA | Lc 41.9 | Non-text elements, placeholder text |
| #398DDB text on white | 3.49:1 | AA large text | Lc 62.2 | Content text, not long reading |
| #398DDB text on black | 6.00:1 | AA | Lc -39.5 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9FC5ED
oklch(81% 0.07 250)
-
Step 400
400
#68A5E3
oklch(70.6% 0.111 250)
-
Step 500
500 (this color)
#398DDB
oklch(62.9% 0.143 249.8)
-
Step 600
600
#0576C9
oklch(55.6% 0.155 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#02518D
oklch(42.8% 0.119 249.8)
-
Step 900
900
#114470
oklch(37.8% 0.092 249.2)
-
Step 950
950
#0C2842
oklch(27.1% 0.059 249.5)
#398DDB 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) | #6991DE | 0.047 |
| Deuteranopia (no green cones) | #5182D9 | 0.032 |
| Tritanopia (no blue cones) | #00A0AA | 0.106 |
| Achromatopsia (no color) | #898989 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #398DDB
#398DDB
oklch(62.9% 0.143 249.8)
- #BD7800
#BD7800
oklch(63.1% 0.137 69.9)
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 #398DDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.017
- Water Blue #0E87CC ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.038
- Soft Blue #6488EA ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.054
- Cool Blue #4984B8 ΔE 0.054
- Faded Blue #658CBB ΔE 0.059
Use #398DDB 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.