#173C43
Closest named color: Midnight Green (#073B4C). oklch(33.3% 0.044 211.8), rgb(23, 60, 67).
Aa
White text reads best on this color (11.90:1).
About this color
#173C43 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.044 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.020 away. White text reads best on it, at 11.90:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #173C43 |
| RGB | rgb(23, 60, 67) |
| HSL | hsl(190, 49%, 18%) |
| OKLCH | oklch(33.3% 0.044 211.8) |
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 #173C43 | 11.90:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #173C43 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #173C43 text on white | 11.90:1 | AAA | Lc 97.1 | Preferred for body text |
| #173C43 text on black | 1.76:1 | 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
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A9C7CD
oklch(80.9% 0.033 211.1)
-
Step 400
400
#7BAAB4
oklch(70.8% 0.052 212.3)
-
Step 500
500
#5695A1
oklch(63.2% 0.067 211.2)
-
Step 600
600
#397F8C
oklch(55.7% 0.072 211.5)
-
Step 700
700
#2A6B77
oklch(49.1% 0.068 211.7)
-
Step 800
800
#255761
oklch(42.7% 0.056 212.7)
-
Step 900
900 (this color)
#173C43
oklch(33.3% 0.044 211.8)
-
Step 950
950
#152A2E
oklch(26.9% 0.028 211.1)
#173C43 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) | #363A43 | 0.040 |
| Deuteranopia (no green cones) | #303543 | 0.037 |
| Tritanopia (no blue cones) | #003F3E | 0.021 |
| Achromatopsia (no color) | #373737 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173C43
#173C43
oklch(33.3% 0.044 211.8)
- #4A2E28
#4A2E28
oklch(33.4% 0.043 32.7)
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 #173C43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.022
- Onyx #343A40 ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Charcoal #264653 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.053
Use #173C43 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.