#404357
Closest named color: Dark Grey Blue (#29465B). oklch(38.8% 0.034 278), rgb(64, 67, 87).
Aa
White text reads best on this color (9.72:1).
About this color
#404357 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.034 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 9.72:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.15:1 |
| White text | 9.72:1 |
Values
| HEX | #404357 |
| RGB | rgb(64, 67, 87) |
| HSL | hsl(232, 15%, 30%) |
| OKLCH | oklch(38.8% 0.034 278) |
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 #404357 | 9.72:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #404357 | 2.15:1 | Fails | Lc 11.4 | Not readable |
| #404357 text on white | 9.72:1 | AAA | Lc 92.6 | Preferred for body text |
| #404357 text on black | 2.15:1 | Fails | Lc -9.9 | Not readable |
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 900.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D7D8E3
oklch(88.5% 0.015 281.9)
-
Step 300
300
#BCBFD1
oklch(80.8% 0.025 278.3)
-
Step 400
400
#9A9FBB
oklch(70.8% 0.041 277.3)
-
Step 500
500
#8287A9
oklch(63.2% 0.051 278.3)
-
Step 600
600
#6B7095
oklch(55.5% 0.058 278.4)
-
Step 700
700
#595E7F
oklch(49.1% 0.053 277.6)
-
Step 800
800
#494D67
oklch(42.7% 0.043 277.6)
-
Step 900
900 (this color)
#404357
oklch(38.8% 0.034 278)
-
Step 950
950
#242631
oklch(27.1% 0.021 276.9)
#404357 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) | #3D4558 | 0.007 |
| Deuteranopia (no green cones) | #3C4356 | 0.007 |
| Tritanopia (no blue cones) | #3B474A | 0.031 |
| Achromatopsia (no color) | #444444 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404357
#404357
oklch(38.8% 0.034 278)
- #494530
#494530
oklch(38.8% 0.034 98.6)
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 #404357, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.036
- Charcoal #264653 ΔE 0.037
- Onyx #343A40 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.058
- Dark Teal #014D4E ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.072
Use #404357 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.