#173E45
Closest named color: Midnight Green (#073B4C). oklch(33.9% 0.045 211.1), rgb(23, 62, 69).
Aa
White text reads best on this color (11.59:1).
About this color
#173E45 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.045 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.021 away. White text reads best on it, at 11.59:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #173E45 |
| RGB | rgb(23, 62, 69) |
| HSL | hsl(189, 50%, 18%) |
| OKLCH | oklch(33.9% 0.045 211.1) |
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 #173E45 | 11.59:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #173E45 | 1.81:1 | Fails | Lc 7.4 | Not readable |
| #173E45 text on white | 11.59:1 | AAA | Lc 96.5 | Preferred for body text |
| #173E45 text on black | 1.81:1 | 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
#A8C7CD
oklch(80.9% 0.034 210.7)
-
Step 400
400
#79AAB4
oklch(70.7% 0.054 211.7)
-
Step 500
500
#5495A1
oklch(63.1% 0.069 210.8)
-
Step 600
600
#357F8C
oklch(55.6% 0.075 210.9)
-
Step 700
700
#276B77
oklch(49% 0.07 211.2)
-
Step 800
800
#225761
oklch(42.6% 0.058 212)
-
Step 900
900 (this color)
#173E45
oklch(33.9% 0.045 211.1)
-
Step 950
950
#152A2E
oklch(26.9% 0.028 211.1)
#173E45 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) | #383C45 | 0.042 |
| Deuteranopia (no green cones) | #313745 | 0.037 |
| Tritanopia (no blue cones) | #004140 | 0.021 |
| Achromatopsia (no color) | #393939 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173E45
#173E45
oklch(33.9% 0.045 211.1)
- #4D2F29
#4D2F29
oklch(34% 0.046 31.9)
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 #173E45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.022
- Onyx #343A40 ΔE 0.036
- Charcoal #264653 ΔE 0.038
- Gunmetal #293241 ΔE 0.042
- Dark Teal #014D4E ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.050
Use #173E45 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.