#21353B
Closest named color: Gunmetal (#293241). oklch(31.5% 0.028 218.6), rgb(33, 53, 59).
Aa
White text reads best on this color (12.82:1).
About this color
#21353B is a dark close to neutral grey. In OKLCH its lightness is 31%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Gunmetal (#293241), ΔE 0.021 away. White text reads best on it, at 12.82:1.
| Hue family | Neutrals |
| Lightness | dark (31%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.63:1 |
| White text | 12.82:1 |
Values
| HEX | #21353B |
| RGB | rgb(33, 53, 59) |
| HSL | hsl(194, 28%, 18%) |
| OKLCH | oklch(31.5% 0.028 218.6) |
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 #21353B | 12.82:1 | AAA | Lc -102.2 | Preferred for body text |
| Black text on #21353B | 1.63:1 | Fails | Lc 0.0 | Not readable |
| #21353B text on white | 12.82:1 | AAA | Lc 98.9 | Preferred for body text |
| #21353B text on black | 1.63:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3EBEE
oklch(93.5% 0.009 222.1)
-
Step 200
200
#CDDCE1
oklch(88.5% 0.018 219.7)
-
Step 300
300
#AAC6CF
oklch(80.9% 0.033 219.2)
-
Step 400
400
#7CA9B7
oklch(70.7% 0.052 219)
-
Step 500
500
#5894A5
oklch(63.2% 0.067 218)
-
Step 600
600
#3B7E90
oklch(55.7% 0.073 217.9)
-
Step 700
700
#2C6A7B
oklch(49.1% 0.068 218.7)
-
Step 800
800
#265664
oklch(42.6% 0.057 219.6)
-
Step 900
900
#244751
oklch(37.6% 0.044 218.5)
-
Step 950
950 (this color)
#21353B
oklch(31.5% 0.028 218.6)
#21353B 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) | #31343B | 0.024 |
| Deuteranopia (no green cones) | #2D313B | 0.021 |
| Tritanopia (no blue cones) | #173737 | 0.016 |
| Achromatopsia (no color) | #323232 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21353B
#21353B
oklch(31.5% 0.028 218.6)
- #3E2D27
#3E2D27
oklch(31.5% 0.027 40.3)
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 #21353B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.033
- Midnight Green #073B4C ΔE 0.035
- Onyx #343A40 ΔE 0.035
- Space Cadet #2B2D42 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.054
- Jet #212529 ΔE 0.056
Use #21353B 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.