#223B37
Closest named color: Onyx (#343A40). oklch(33.1% 0.032 183.1), rgb(34, 59, 55).
Aa
White text reads best on this color (12.00:1).
About this color
#223B37 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.032 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.032 away. White text reads best on it, at 12.00:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.74:1 |
| White text | 12.00:1 |
Values
| HEX | #223B37 |
| RGB | rgb(34, 59, 55) |
| HSL | hsl(170, 27%, 18%) |
| OKLCH | oklch(33.1% 0.032 183.1) |
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 #223B37 | 12.00:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #223B37 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #223B37 text on white | 12.00:1 | AAA | Lc 97.4 | Preferred for body text |
| #223B37 text on black | 1.74:1 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D0DCDA
oklch(88.5% 0.013 185.1)
-
Step 300
300
#B1C6C2
oklch(81% 0.024 183)
-
Step 400
400
#87A9A3
oklch(70.8% 0.038 183.3)
-
Step 500
500
#68948C
oklch(63.2% 0.05 182.1)
-
Step 600
600
#4E7E76
oklch(55.6% 0.054 182.6)
-
Step 700
700
#3F6A63
oklch(49.1% 0.049 182.7)
-
Step 800
800
#345751
oklch(42.8% 0.042 182.2)
-
Step 900
900 (this color)
#223B37
oklch(33.1% 0.032 183.1)
-
Step 950
950
#1B2A27
oklch(27% 0.021 180.8)
#223B37 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) | #393837 | 0.035 |
| Deuteranopia (no green cones) | #343537 | 0.032 |
| Tritanopia (no blue cones) | #193C3A | 0.010 |
| Achromatopsia (no color) | #363636 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223B37
#223B37
oklch(33.1% 0.032 183.1)
- #442F34
#442F34
oklch(33.1% 0.032 3.2)
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 #223B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.040
- Midnight Green #073B4C ΔE 0.041
- Gunmetal #293241 ΔE 0.041
- Pakistan Green #283618 ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.048
- Charcoal #264653 ΔE 0.054
- Evergreen #05472A ΔE 0.057
Use #223B37 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.