#233D37
Closest named color: Onyx (#343A40). oklch(33.7% 0.034 177.8), rgb(35, 61, 55).
Aa
White text reads best on this color (11.70:1).
About this color
#233D37 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.034 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.033 away. White text reads best on it, at 11.70:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.79:1 |
| White text | 11.70:1 |
Values
| HEX | #233D37 |
| RGB | rgb(35, 61, 55) |
| HSL | hsl(166, 27%, 19%) |
| OKLCH | oklch(33.7% 0.034 177.8) |
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 #233D37 | 11.70:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #233D37 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #233D37 text on white | 11.70:1 | AAA | Lc 96.8 | Preferred for body text |
| #233D37 text on black | 1.79:1 | 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
#D0DCD9
oklch(88.5% 0.014 179.4)
-
Step 300
300
#B0C6C0
oklch(80.8% 0.025 177.5)
-
Step 400
400
#86A9A0
oklch(70.6% 0.04 177.6)
-
Step 500
500
#679489
oklch(63.1% 0.052 177.6)
-
Step 600
600
#4D7E73
oklch(55.5% 0.056 178.2)
-
Step 700
700
#3E6B61
oklch(49.2% 0.053 178.2)
-
Step 800
800
#33574F
oklch(42.7% 0.044 178.3)
-
Step 900
900 (this color)
#233D37
oklch(33.7% 0.034 177.8)
-
Step 950
950
#1B2A26
oklch(27% 0.022 176.2)
#233D37 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) | #3B3A37 | 0.036 |
| Deuteranopia (no green cones) | #373737 | 0.034 |
| Tritanopia (no blue cones) | #1B3E3B | 0.010 |
| Achromatopsia (no color) | #383838 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D37
#233D37
oklch(33.7% 0.034 177.8)
- #463037
#463037
oklch(33.7% 0.034 358.3)
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 #233D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.044
- Midnight Green #073B4C ΔE 0.045
- Pakistan Green #283618 ΔE 0.047
- Gunmetal #293241 ΔE 0.047
- Charcoal #264653 ΔE 0.051
- Evergreen #05472A ΔE 0.052
Use #233D37 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.