#223D3F
Closest named color: Onyx (#343A40). oklch(33.9% 0.033 201.8), rgb(34, 61, 63).
Aa
White text reads best on this color (11.61:1).
About this color
#223D3F is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.033 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.026 away. White text reads best on it, at 11.61:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.61:1 |
Values
| HEX | #223D3F |
| RGB | rgb(34, 61, 63) |
| HSL | hsl(184, 30%, 19%) |
| OKLCH | oklch(33.9% 0.033 201.8) |
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 #223D3F | 11.61:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #223D3F | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #223D3F text on white | 11.61:1 | AAA | Lc 96.7 | Preferred for body text |
| #223D3F text on black | 1.80:1 | 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
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#CFDCDD
oklch(88.5% 0.014 202.4)
-
Step 300
300
#AFC6C7
oklch(81% 0.025 199.9)
-
Step 400
400
#84A8AB
oklch(70.6% 0.039 202.6)
-
Step 500
500
#649396
oklch(63.1% 0.051 201)
-
Step 600
600
#4A7D81
oklch(55.5% 0.055 202.1)
-
Step 700
700
#3B6A6D
oklch(49.2% 0.052 200.9)
-
Step 800
800
#315659
oklch(42.7% 0.043 202.3)
-
Step 900
900 (this color)
#223D3F
oklch(33.9% 0.033 201.8)
-
Step 950
950
#1A2A2B
oklch(27.1% 0.021 200.9)
#223D3F 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) | #393B3F | 0.033 |
| Deuteranopia (no green cones) | #34373F | 0.031 |
| Tritanopia (no blue cones) | #153F3E | 0.014 |
| Achromatopsia (no color) | #393939 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223D3F
#223D3F
oklch(33.9% 0.033 201.8)
- #483130
#483130
oklch(34% 0.034 21.8)
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 #223D3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.028
- Midnight Green #073B4C ΔE 0.033
- Gunmetal #293241 ΔE 0.039
- Charcoal #264653 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.041
- Dark Teal #014D4E ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.053
Use #223D3F 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.