#21313E
Closest named color: Gunmetal (#293241). oklch(30.5% 0.032 243.6), rgb(33, 49, 62).
Aa
White text reads best on this color (13.34:1).
About this color
#21313E is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.032 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.014 away. White text reads best on it, at 13.34:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.57:1 |
| White text | 13.34:1 |
Values
| HEX | #21313E |
| RGB | rgb(33, 49, 62) |
| HSL | hsl(207, 31%, 19%) |
| OKLCH | oklch(30.5% 0.032 243.6) |
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 #21313E | 13.34:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #21313E | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #21313E text on white | 13.34:1 | AAA | Lc 99.7 | Preferred for body text |
| #21313E text on black | 1.57:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D8
oklch(80.9% 0.038 244.5)
-
Step 400
400
#81A5C4
oklch(70.6% 0.06 244.8)
-
Step 500
500
#608FB5
oklch(63.1% 0.077 243.8)
-
Step 600
600
#4579A1
oklch(55.7% 0.084 243.3)
-
Step 700
700
#36658A
oklch(49% 0.079 244.2)
-
Step 800
800
#2E5370
oklch(42.8% 0.064 243.8)
-
Step 900
900
#29455A
oklch(37.8% 0.05 242.1)
-
Step 950
950 (this color)
#21313E
oklch(30.5% 0.032 243.6)
#21313E 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) | #2C313F | 0.017 |
| Deuteranopia (no green cones) | #282E3E | 0.014 |
| Tritanopia (no blue cones) | #163435 | 0.026 |
| Achromatopsia (no color) | #2F2F2F | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21313E
#21313E
oklch(30.5% 0.032 243.6)
- #3B2C1E
#3B2C1E
oklch(30.6% 0.032 64.2)
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 #21313E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.014
- Space Cadet #2B2D42 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.037
- Midnight Green #073B4C ΔE 0.039
- Oxford Blue #1B263B ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.044
- Onyx #343A40 ΔE 0.044
- Dark #1B2431 ΔE 0.048
Use #21313E 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.