#223F3E
Closest named color: Onyx (#343A40). oklch(34.5% 0.035 192.8), rgb(34, 63, 62).
Aa
White text reads best on this color (11.36:1).
About this color
#223F3E is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.035 and its hue 193°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.030 away. White text reads best on it, at 11.36:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.84:1 |
| White text | 11.36:1 |
Values
| HEX | #223F3E |
| RGB | rgb(34, 63, 62) |
| HSL | hsl(178, 30%, 19%) |
| OKLCH | oklch(34.5% 0.035 192.8) |
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 #223F3E | 11.36:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #223F3E | 1.84:1 | Fails | Lc 7.8 | Not readable |
| #223F3E text on white | 11.36:1 | AAA | Lc 96.1 | Preferred for body text |
| #223F3E text on black | 1.84:1 | 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 900.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4EBEB
oklch(93.5% 0.007 197)
-
Step 200
200
#CFDCDC
oklch(88.5% 0.014 196.9)
-
Step 300
300
#AEC6C5
oklch(80.8% 0.026 193.6)
-
Step 400
400
#83A9A8
oklch(70.7% 0.041 194.2)
-
Step 500
500
#629492
oklch(63.1% 0.054 192.7)
-
Step 600
600
#477E7D
oklch(55.5% 0.058 194.1)
-
Step 700
700
#386B69
oklch(49.2% 0.055 192.2)
-
Step 800
800
#2F5756
oklch(42.7% 0.045 193.5)
-
Step 900
900 (this color)
#223F3E
oklch(34.5% 0.035 192.8)
-
Step 950
950
#192A29
oklch(27% 0.023 191.2)
#223F3E 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) | #3C3C3E | 0.038 |
| Deuteranopia (no green cones) | #37383E | 0.036 |
| Tritanopia (no blue cones) | #15413F | 0.013 |
| Achromatopsia (no color) | #3A3A3A | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223F3E
#223F3E
oklch(34.5% 0.035 192.8)
- #4A3234
#4A3234
oklch(34.6% 0.035 13.5)
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 #223F3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.034
- Midnight Green #073B4C ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.039
- Charcoal #264653 ΔE 0.039
- Gunmetal #293241 ΔE 0.047
- Dark Teal #014D4E ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.052
Use #223F3E 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.