#6375AA
Closest named color: Stormy Blue (#507B9C). oklch(57% 0.085 269.3), rgb(99, 117, 170).
Aa
Black text reads best on this color (4.65:1).
About this color
#6375AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.085 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.039 away. Black text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.65:1 |
| White text | 4.51:1 |
Values
| HEX | #6375AA |
| RGB | rgb(99, 117, 170) |
| HSL | hsl(225, 29%, 53%) |
| OKLCH | oklch(57% 0.085 269.3) |
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 #6375AA | 4.51:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #6375AA | 4.65:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #6375AA text on white | 4.51:1 | AA | Lc 71.3 | Content text, not long reading |
| #6375AA text on black | 4.65:1 | AA | Lc -30.4 | 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 600.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF2
oklch(93.7% 0.011 269.5)
-
Step 200
200
#D3D9E8
oklch(88.5% 0.022 268.4)
-
Step 300
300
#B6C0DA
oklch(80.8% 0.038 268.8)
-
Step 400
400
#91A0C8
oklch(70.8% 0.061 268.8)
-
Step 500
500
#7688B9
oklch(63.2% 0.077 268.6)
-
Step 600
600 (this color)
#6375AA
oklch(57% 0.085 269.3)
-
Step 700
700
#4E5E8E
oklch(49% 0.08 269.3)
-
Step 800
800
#404D73
oklch(42.6% 0.066 269.1)
-
Step 900
900
#36405D
oklch(37.6% 0.052 269.2)
-
Step 950
950
#202636
oklch(27% 0.031 268.4)
#6375AA 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) | #637AAC | 0.014 |
| Deuteranopia (no green cones) | #5C74A9 | 0.010 |
| Tritanopia (no blue cones) | #4B8088 | 0.077 |
| Achromatopsia (no color) | #767676 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6375AA
#6375AA
oklch(57% 0.085 269.3)
- #8B7538
#8B7538
oklch(57% 0.085 89.7)
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 #6375AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.039
- Dull Blue #49759C ΔE 0.040
- Off Blue #5684AE ΔE 0.042
- Steel Blue #4682B4 ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.046
- Cerulean #457B9D ΔE 0.046
- Cool Blue #4984B8 ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.047
Use #6375AA 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.