#21373B
Closest named color: Gunmetal (#293241). oklch(32% 0.029 210.2), rgb(33, 55, 59).
Aa
White text reads best on this color (12.54:1).
About this color
#21373B is a dark close to neutral grey. In OKLCH its lightness is 32%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Gunmetal (#293241), ΔE 0.025 away. White text reads best on it, at 12.54:1.
| Hue family | Neutrals |
| Lightness | dark (32%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.67:1 |
| White text | 12.54:1 |
Values
| HEX | #21373B |
| RGB | rgb(33, 55, 59) |
| HSL | hsl(189, 28%, 18%) |
| OKLCH | oklch(32% 0.029 210.2) |
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 #21373B | 12.54:1 | AAA | Lc -101.8 | Preferred for body text |
| Black text on #21373B | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #21373B text on white | 12.54:1 | AAA | Lc 98.4 | Preferred for body text |
| #21373B text on black | 1.67:1 | 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
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A8C7CD
oklch(80.9% 0.034 210.7)
-
Step 400
400
#79AAB3
oklch(70.6% 0.054 210.2)
-
Step 500
500
#5395A1
oklch(63.1% 0.07 210.6)
-
Step 600
600
#347F8C
oklch(55.5% 0.076 210.7)
-
Step 700
700
#266B77
oklch(49% 0.07 211.1)
-
Step 800
800
#225861
oklch(42.8% 0.058 210.1)
-
Step 900
900
#21484F
oklch(37.6% 0.046 210.7)
-
Step 950
950 (this color)
#21373B
oklch(32% 0.029 210.2)
#21373B 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) | #33353B | 0.027 |
| Deuteranopia (no green cones) | #2F323B | 0.025 |
| Tritanopia (no blue cones) | #173938 | 0.015 |
| Achromatopsia (no color) | #333333 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21373B
#21373B
oklch(32% 0.029 210.2)
- #402E2A
#402E2A
oklch(32.1% 0.028 32.8)
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 #21373B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.031
- Onyx #343A40 ΔE 0.032
- Midnight Green #073B4C ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.053
- Charcoal Grey #3C4142 ΔE 0.055
- Pakistan Green #283618 ΔE 0.057
Use #21373B 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.