#172C4F
Closest named color: Prussian Blue (#1D3557). oklch(29.6% 0.069 260.1), rgb(23, 44, 79).
Aa
White text reads best on this color (13.91:1).
About this color
#172C4F is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.069 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.032 away. White text reads best on it, at 13.91:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.50:1 |
| White text | 13.91:1 |
Values
| HEX | #172C4F |
| RGB | rgb(23, 44, 79) |
| HSL | hsl(218, 55%, 20%) |
| OKLCH | oklch(29.6% 0.069 260.1) |
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 #172C4F | 13.91:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #172C4F | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #172C4F text on white | 13.91:1 | AAA | Lc 100.4 | Preferred for body text |
| #172C4F 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F6
oklch(80.9% 0.082 260)
-
Step 400
400
#6FA0F2
oklch(70.6% 0.132 260.2)
-
Step 500
500
#4886ED
oklch(63% 0.168 260)
-
Step 600
600
#2A6DDC
oklch(55.6% 0.183 260.1)
-
Step 700
700
#1D5ABF
oklch(49% 0.171 260.2)
-
Step 800
800
#1A4A9A
oklch(42.6% 0.141 260.2)
-
Step 900
900
#1B3F7B
oklch(37.7% 0.11 260)
-
Step 950
950 (this color)
#172C4F
oklch(29.6% 0.069 260.1)
#172C4F 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) | #1C2F50 | 0.012 |
| Deuteranopia (no green cones) | #142A4E | 0.008 |
| Tritanopia (no blue cones) | #003439 | 0.058 |
| Achromatopsia (no color) | #2C2C2C | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172C4F
#172C4F
oklch(29.6% 0.069 260.1)
- #3D2900
#3D2900
oklch(29.7% 0.062 80.2)
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 #172C4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.032
- Marine #042E60 ΔE 0.032
- Space Cadet #2B2D42 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.038
- Gunmetal #293241 ΔE 0.044
- Midnight Green #073B4C ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.053
- Marine Blue #01386A ΔE 0.055
Use #172C4F 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.