#203D39
Closest named color: Onyx (#343A40). oklch(33.6% 0.036 184.4), rgb(32, 61, 57).
Aa
White text reads best on this color (11.74:1).
About this color
#203D39 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.036 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.034 away. White text reads best on it, at 11.74:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.78:1 |
| White text | 11.74:1 |
Values
| HEX | #203D39 |
| RGB | rgb(32, 61, 57) |
| HSL | hsl(172, 31%, 18%) |
| OKLCH | oklch(33.6% 0.036 184.4) |
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 #203D39 | 11.74:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #203D39 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #203D39 text on white | 11.74:1 | AAA | Lc 96.9 | Preferred for body text |
| #203D39 text on black | 1.78:1 | 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
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CFDCDA
oklch(88.4% 0.014 185.9)
-
Step 300
300
#AEC7C2
oklch(80.9% 0.028 182.2)
-
Step 400
400
#83AAA4
oklch(70.8% 0.043 184.7)
-
Step 500
500
#63958D
oklch(63.2% 0.055 183.4)
-
Step 600
600
#487F77
oklch(55.6% 0.06 183.8)
-
Step 700
700
#396B64
oklch(49% 0.056 184)
-
Step 800
800
#305752
oklch(42.6% 0.045 185.2)
-
Step 900
900 (this color)
#203D39
oklch(33.6% 0.036 184.4)
-
Step 950
950
#192A28
oklch(26.9% 0.023 186.7)
#203D39 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) | #3A3A39 | 0.038 |
| Deuteranopia (no green cones) | #353639 | 0.036 |
| Tritanopia (no blue cones) | #143E3C | 0.011 |
| Achromatopsia (no color) | #383838 | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203D39
#203D39
oklch(33.6% 0.036 184.4)
- #472F34
#472F34
oklch(33.5% 0.036 5.5)
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 #203D39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.039
- Midnight Green #073B4C ΔE 0.040
- Gunmetal #293241 ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.046
- Charcoal #264653 ΔE 0.049
- Pakistan Green #283618 ΔE 0.050
- Evergreen #05472A ΔE 0.053
Use #203D39 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.