#6388DD
Closest named color: Soft Blue (#6488EA). oklch(63.8% 0.135 265), rgb(99, 136, 221).
Aa
Black text reads best on this color (6.09:1).
About this color
#6388DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.135 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.020 away. Black text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.09:1 |
| White text | 3.44:1 |
Values
| HEX | #6388DD |
| RGB | rgb(99, 136, 221) |
| HSL | hsl(222, 64%, 63%) |
| OKLCH | oklch(63.8% 0.135 265) |
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 #6388DD | 3.44:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #6388DD | 6.09:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #6388DD text on white | 3.44:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #6388DD text on black | 6.09:1 | AA | Lc -39.9 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDD9F2
oklch(88.4% 0.037 265.1)
-
Step 300
300
#ACC1EC
oklch(81% 0.065 264.5)
-
Step 400
400
#809FE3
oklch(70.6% 0.106 265)
-
Step 500
500 (this color)
#6388DD
oklch(63.8% 0.135 265)
-
Step 600
600
#486EC8
oklch(55.6% 0.146 264.8)
-
Step 700
700
#3A5BAD
oklch(49% 0.136 265.2)
-
Step 800
800
#304B8C
oklch(42.7% 0.113 265)
-
Step 900
900
#2A3F70
oklch(37.6% 0.088 265)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#6388DD 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) | #6590E0 | 0.022 |
| Deuteranopia (no green cones) | #5685DB | 0.018 |
| Tritanopia (no blue cones) | #179BA8 | 0.121 |
| Achromatopsia (no color) | #8A8A8A | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6388DD
#6388DD
oklch(63.8% 0.135 265)
- #B08400
#B08400
oklch(63.9% 0.131 84.9)
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 #6388DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.020
- Dark Sky Blue #448EE4 ΔE 0.031
- Cornflower Blue #6495ED ΔE 0.038
- Chefchaouen Blue #4895EF ΔE 0.043
- Faded Blue #658CBB ΔE 0.056
- Cornflower #6A79F7 ΔE 0.059
- Perrywinkle #8F8CE7 ΔE 0.061
- Cool Blue #4984B8 ΔE 0.065
Use #6388DD 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.