#203F37
Closest named color: Onyx (#343A40). oklch(34.1% 0.04 175.2), rgb(32, 63, 55).
Aa
White text reads best on this color (11.49:1).
About this color
#203F37 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.040 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.038 away. White text reads best on it, at 11.49:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.82:1 |
| White text | 11.49:1 |
Values
| HEX | #203F37 |
| RGB | rgb(32, 63, 55) |
| HSL | hsl(165, 33%, 19%) |
| OKLCH | oklch(34.1% 0.04 175.2) |
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 #203F37 | 11.49:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #203F37 | 1.82:1 | Fails | Lc 7.5 | Not readable |
| #203F37 text on white | 11.49:1 | AAA | Lc 96.4 | Preferred for body text |
| #203F37 text on black | 1.82:1 | 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
#E4ECE9
oklch(93.6% 0.009 171.8)
-
Step 200
200
#CEDDD8
oklch(88.5% 0.017 174)
-
Step 300
300
#AEC7BF
oklch(80.9% 0.029 174.3)
-
Step 400
400
#82AB9F
oklch(70.8% 0.048 175)
-
Step 500
500
#619687
oklch(63.1% 0.061 174.5)
-
Step 600
600
#468071
oklch(55.6% 0.066 175.1)
-
Step 700
700
#376C5F
oklch(49% 0.061 175.8)
-
Step 800
800
#2E584D
oklch(42.6% 0.051 174.9)
-
Step 900
900 (this color)
#203F37
oklch(34.1% 0.04 175.2)
-
Step 950
950
#192B26
oklch(27.2% 0.026 174.9)
#203F37 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) | #3D3C37 | 0.042 |
| Deuteranopia (no green cones) | #383838 | 0.040 |
| Tritanopia (no blue cones) | #15403D | 0.013 |
| Achromatopsia (no color) | #393939 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203F37
#203F37
oklch(34.1% 0.04 175.2)
- #492F39
#492F39
oklch(34% 0.041 354.8)
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 #203F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.038
- Evergreen #05472A ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.046
- Midnight Green #073B4C ΔE 0.047
- Pakistan Green #283618 ΔE 0.048
- Charcoal #264653 ΔE 0.050
- Dark Teal #014D4E ΔE 0.051
Use #203F37 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.