#4388EF
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.17 258.4), rgb(67, 136, 239).
Aa
Black text reads best on this color (6.00:1).
About this color
#4388EF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.170 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.025 away. Black text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.00:1 |
| White text | 3.49:1 |
Values
| HEX | #4388EF |
| RGB | rgb(67, 136, 239) |
| HSL | hsl(216, 84%, 60%) |
| OKLCH | oklch(63.4% 0.17 258.4) |
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 #4388EF | 3.49:1 | AA large text | Lc -67.6 | Content text, not long reading |
| Black text on #4388EF | 6.00:1 | AA | Lc 41.9 | Non-text elements, placeholder text |
| #4388EF text on white | 3.49:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #4388EF 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#A0C3F7
oklch(81% 0.083 258.1)
-
Step 400
400
#6BA1F3
oklch(70.7% 0.134 258.5)
-
Step 500
500 (this color)
#4388EF
oklch(63.4% 0.17 258.4)
-
Step 600
600
#206EDD
oklch(55.6% 0.185 258.5)
-
Step 700
700
#125BBF
oklch(49% 0.171 258.5)
-
Step 800
800
#134B9B
oklch(42.7% 0.143 258.6)
-
Step 900
900
#17407B
oklch(37.8% 0.11 258.1)
-
Step 950
950
#0F2648
oklch(27.1% 0.07 258.2)
#4388EF 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) | #5592F3 | 0.033 |
| Deuteranopia (no green cones) | #3582ED | 0.021 |
| Tritanopia (no blue cones) | #00A0B0 | 0.133 |
| Achromatopsia (no color) | #898989 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4388EF
#4388EF
oklch(63.4% 0.17 258.4)
- #B57F00
#B57F00
oklch(63.4% 0.132 78.7)
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 #4388EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.025
- Dodger Blue #1E90FF ΔE 0.032
- Soft Blue #6488EA ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.036
- Clear Blue #247AFD ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.050
- Cornflower #6A79F7 ΔE 0.053
- Water Blue #0E87CC ΔE 0.062
Use #4388EF 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.