#173F43
Closest named color: Midnight Green (#073B4C). oklch(34.1% 0.045 204.2), rgb(23, 63, 67).
Aa
White text reads best on this color (11.48:1).
About this color
#173F43 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.045 and its hue 204°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.027 away. White text reads best on it, at 11.48:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.82:1 |
| White text | 11.48:1 |
Values
| HEX | #173F43 |
| RGB | rgb(23, 63, 67) |
| HSL | hsl(185, 49%, 18%) |
| OKLCH | oklch(34.1% 0.045 204.2) |
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 #173F43 | 11.48:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #173F43 | 1.82:1 | Fails | Lc 7.6 | Not readable |
| #173F43 text on white | 11.48:1 | AAA | Lc 96.3 | Preferred for body text |
| #173F43 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#A8C7CB
oklch(80.8% 0.034 206)
-
Step 400
400
#78ABB0
oklch(70.7% 0.054 203.7)
-
Step 500
500
#53969D
oklch(63.2% 0.069 204.3)
-
Step 600
600
#348088
oklch(55.6% 0.075 204.8)
-
Step 700
700
#256C73
oklch(49.1% 0.07 204.4)
-
Step 800
800
#21585E
oklch(42.7% 0.058 205.1)
-
Step 900
900 (this color)
#173F43
oklch(34.1% 0.045 204.2)
-
Step 950
950
#142B2D
oklch(27.1% 0.029 202.9)
#173F43 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) | #3A3C43 | 0.045 |
| Deuteranopia (no green cones) | #333743 | 0.041 |
| Tritanopia (no blue cones) | #004240 | 0.018 |
| Achromatopsia (no color) | #393939 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173F43
#173F43
oklch(34.1% 0.045 204.2)
- #4D2F2D
#4D2F2D
oklch(34.1% 0.045 23.8)
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 #173F43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.027
- Onyx #343A40 ΔE 0.037
- Charcoal #264653 ΔE 0.038
- Dark Teal #014D4E ΔE 0.045
- Gunmetal #293241 ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.050
Use #173F43 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.