#172F47
Closest named color: Space Cadet (#2B2D42). oklch(29.8% 0.053 250), rgb(23, 47, 71).
Aa
White text reads best on this color (13.68:1).
About this color
#172F47 is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.053 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Space Cadet (#2B2D42), ΔE 0.028 away. White text reads best on it, at 13.68:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Space Cadet (#2B2D42) |
| Black text | 1.53:1 |
| White text | 13.68:1 |
Values
| HEX | #172F47 |
| RGB | rgb(23, 47, 71) |
| HSL | hsl(210, 51%, 18%) |
| OKLCH | oklch(29.8% 0.053 250) |
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 #172F47 | 13.68:1 | AAA | Lc -103.2 | Preferred for body text |
| Black text on #172F47 | 1.53:1 | Fails | Lc 0.0 | Not readable |
| #172F47 text on white | 13.68:1 | AAA | Lc 100.1 | Preferred for body text |
| #172F47 text on black | 1.53:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF0
oklch(88.4% 0.036 250.9)
-
Step 300
300
#A2C4E8
oklch(80.8% 0.063 250.1)
-
Step 400
400
#6FA5DD
oklch(70.7% 0.1 250.3)
-
Step 500
500
#458ED4
oklch(63.2% 0.129 249.7)
-
Step 600
600
#2176C1
oklch(55.5% 0.14 250)
-
Step 700
700
#1263A7
oklch(49.1% 0.131 250.1)
-
Step 800
800
#145187
oklch(42.7% 0.108 250.1)
-
Step 900
900
#19446C
oklch(37.8% 0.083 249.6)
-
Step 950
950 (this color)
#172F47
oklch(29.8% 0.053 250)
#172F47 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) | #253048 | 0.019 |
| Deuteranopia (no green cones) | #1E2B47 | 0.015 |
| Tritanopia (no blue cones) | #003537 | 0.045 |
| Achromatopsia (no color) | #2D2D2D | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F47
#172F47
oklch(29.8% 0.053 250)
- #3E280B
#3E280B
oklch(29.8% 0.053 70.3)
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 #172F47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Space Cadet #2B2D42 ΔE 0.028
- Gunmetal #293241 ΔE 0.030
- Oxford Blue #1B263B ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.034
- Midnight Green #073B4C ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.042
- Marine #042E60 ΔE 0.047
- Dark #1B2431 ΔE 0.048
Use #172F47 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.