#172F39
Closest named color: Gunmetal (#293241). oklch(29% 0.035 227), rgb(23, 47, 57).
Aa
White text reads best on this color (13.98:1).
About this color
#172F39 is a dark, muted teal or cyan. In OKLCH its lightness is 29%, its chroma 0.035 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.032 away. White text reads best on it, at 13.98:1.
| Hue family | Teals and cyans |
| Lightness | dark (29%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.50:1 |
| White text | 13.98:1 |
Values
| HEX | #172F39 |
| RGB | rgb(23, 47, 57) |
| HSL | hsl(198, 43%, 16%) |
| OKLCH | oklch(29% 0.035 227) |
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 #172F39 | 13.98:1 | AAA | Lc -103.6 | Preferred for body text |
| Black text on #172F39 | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #172F39 text on white | 13.98:1 | AAA | Lc 100.5 | Preferred for body text |
| #172F39 text on black | 1.50:1 | 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 950.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D6
oklch(81% 0.042 226.4)
-
Step 400
400
#73A9C1
oklch(70.6% 0.067 227.6)
-
Step 500
500
#4B94B1
oklch(63.1% 0.085 226.5)
-
Step 600
600
#297E9D
oklch(55.7% 0.092 226.7)
-
Step 700
700
#1A6A86
oklch(49.1% 0.085 226.7)
-
Step 800
800
#19566D
oklch(42.6% 0.071 227.6)
-
Step 900
900
#1C4758
oklch(37.6% 0.055 227.1)
-
Step 950
950 (this color)
#172F39
oklch(29% 0.035 227)
#172F39 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) | #2A2E3A | 0.027 |
| Deuteranopia (no green cones) | #252A39 | 0.024 |
| Tritanopia (no blue cones) | #043232 | 0.025 |
| Achromatopsia (no color) | #2C2C2C | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F39
#172F39
oklch(29% 0.035 227)
- #3A261C
#3A261C
oklch(29% 0.035 47.5)
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 #172F39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.036
- Dark #1B2431 ΔE 0.037
- Jet #212529 ΔE 0.039
- Midnight Green #073B4C ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.056
Use #172F39 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.