#172F4E
Closest named color: Prussian Blue (#1D3557). oklch(30.3% 0.064 255.6), rgb(23, 47, 78).
Aa
White text reads best on this color (13.52:1).
About this color
#172F4E is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.064 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.025 away. White text reads best on it, at 13.52:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.55:1 |
| White text | 13.52:1 |
Values
| HEX | #172F4E |
| RGB | rgb(23, 47, 78) |
| HSL | hsl(214, 54%, 20%) |
| OKLCH | oklch(30.3% 0.064 255.6) |
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 #172F4E | 13.52:1 | AAA | Lc -103.0 | Preferred for body text |
| Black text on #172F4E | 1.55:1 | Fails | Lc 0.0 | Not readable |
| #172F4E text on white | 13.52:1 | AAA | Lc 99.8 | Preferred for body text |
| #172F4E text on black | 1.55:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C3F2
oklch(80.8% 0.077 255.9)
-
Step 400
400
#6CA3EB
oklch(70.7% 0.121 255.6)
-
Step 500
500
#428AE5
oklch(63.2% 0.155 255.6)
-
Step 600
600
#1E72D3
oklch(55.7% 0.168 255.5)
-
Step 700
700
#0E5FB7
oklch(49.2% 0.157 255.5)
-
Step 800
800
#114E94
oklch(42.8% 0.13 255.5)
-
Step 900
900
#174176
oklch(37.7% 0.102 256)
-
Step 950
950 (this color)
#172F4E
oklch(30.3% 0.064 255.6)
#172F4E 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) | #22314F | 0.016 |
| Deuteranopia (no green cones) | #1A2C4D | 0.010 |
| Tritanopia (no blue cones) | #00363A | 0.053 |
| Achromatopsia (no color) | #2E2E2E | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F4E
#172F4E
oklch(30.3% 0.064 255.6)
- #412900
#412900
oklch(30.3% 0.064 75)
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 #172F4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.025
- Space Cadet #2B2D42 ΔE 0.033
- Marine #042E60 ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.041
- Midnight Green #073B4C ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.043
- Marine Blue #01386A ΔE 0.053
Use #172F4E 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.