#173B45
Closest named color: Midnight Green (#073B4C). oklch(33.1% 0.045 218.7), rgb(23, 59, 69).
Aa
White text reads best on this color (12.01:1).
About this color
#173B45 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.045 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.016 away. White text reads best on it, at 12.01:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.74:1 |
| White text | 12.01:1 |
Values
| HEX | #173B45 |
| RGB | rgb(23, 59, 69) |
| HSL | hsl(193, 50%, 18%) |
| OKLCH | oklch(33.1% 0.045 218.7) |
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 #173B45 | 12.01:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #173B45 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #173B45 text on white | 12.01:1 | AAA | Lc 97.3 | Preferred for body text |
| #173B45 text on black | 1.74:1 | 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
#E3EBEE
oklch(93.5% 0.009 222.1)
-
Step 200
200
#CCDCE1
oklch(88.4% 0.019 218.4)
-
Step 300
300
#AAC6CF
oklch(80.9% 0.033 219.2)
-
Step 400
400
#7BA9B7
oklch(70.7% 0.053 218.6)
-
Step 500
500
#5794A5
oklch(63.2% 0.068 217.7)
-
Step 600
600
#3A7E91
oklch(55.7% 0.074 218.8)
-
Step 700
700
#2B6A7B
oklch(49.1% 0.069 218.5)
-
Step 800
800
#255664
oklch(42.6% 0.057 219.3)
-
Step 900
900 (this color)
#173B45
oklch(33.1% 0.045 218.7)
-
Step 950
950
#162A30
oklch(27.1% 0.028 219)
#173B45 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) | #353946 | 0.039 |
| Deuteranopia (no green cones) | #2E3445 | 0.035 |
| Tritanopia (no blue cones) | #003E3E | 0.024 |
| Achromatopsia (no color) | #363636 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173B45
#173B45
oklch(33.1% 0.045 218.7)
- #492D24
#492D24
oklch(32.9% 0.045 38.6)
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 #173B45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.016
- Dark Blue Grey #1F3B4D ΔE 0.018
- Gunmetal #293241 ΔE 0.034
- Onyx #343A40 ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.043
- Charcoal #264653 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.054
Use #173B45 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.