#23403D
Closest named color: Onyx (#343A40). oklch(34.8% 0.035 187.2), rgb(35, 64, 61).
Aa
White text reads best on this color (11.21:1).
About this color
#23403D is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.035 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.031 away. White text reads best on it, at 11.21:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.21:1 |
Values
| HEX | #23403D |
| RGB | rgb(35, 64, 61) |
| HSL | hsl(174, 29%, 19%) |
| OKLCH | oklch(34.8% 0.035 187.2) |
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 #23403D | 11.21:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #23403D | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #23403D text on white | 11.21:1 | AAA | Lc 95.8 | Preferred for body text |
| #23403D text on black | 1.87:1 | 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
#E4ECEB
oklch(93.7% 0.009 188.1)
-
Step 200
200
#CFDCDB
oklch(88.4% 0.014 191.4)
-
Step 300
300
#AEC6C3
oklch(80.8% 0.026 187.5)
-
Step 400
400
#83AAA5
oklch(70.8% 0.043 186.6)
-
Step 500
500
#62948F
oklch(63% 0.054 188)
-
Step 600
600
#487F79
oklch(55.7% 0.059 186.7)
-
Step 700
700
#396B66
oklch(49.1% 0.055 187.2)
-
Step 800
800
#305753
oklch(42.7% 0.045 187.2)
-
Step 900
900 (this color)
#23403D
oklch(34.8% 0.035 187.2)
-
Step 950
950
#192A28
oklch(26.9% 0.023 186.7)
#23403D 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) | #3D3D3D | 0.038 |
| Deuteranopia (no green cones) | #38393D | 0.036 |
| Tritanopia (no blue cones) | #17413F | 0.012 |
| Achromatopsia (no color) | #3B3B3B | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23403D
#23403D
oklch(34.8% 0.035 187.2)
- #4A3237
#4A3237
oklch(34.7% 0.036 5.4)
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 #23403D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.038
- Charcoal #264653 ΔE 0.039
- Midnight Green #073B4C ΔE 0.042
- Dark Teal #014D4E ΔE 0.045
- Gunmetal #293241 ΔE 0.051
- Evergreen #05472A ΔE 0.052
Use #23403D 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.