#172D4D
Closest named color: Prussian Blue (#1D3557). oklch(29.7% 0.065 257.8), rgb(23, 45, 77).
Aa
White text reads best on this color (13.82:1).
About this color
#172D4D is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.065 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.031 away. White text reads best on it, at 13.82:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.51:1 |
| White text | 13.82:1 |
Values
| HEX | #172D4D |
| RGB | rgb(23, 45, 77) |
| HSL | hsl(216, 54%, 20%) |
| OKLCH | oklch(29.7% 0.065 257.8) |
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 #172D4D | 13.82:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #172D4D | 1.51:1 | Fails | Lc 0.0 | Not readable |
| #172D4D text on white | 13.82:1 | AAA | Lc 100.3 | Preferred for body text |
| #172D4D text on black | 1.51:1 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C3F3
oklch(81% 0.077 257.7)
-
Step 400
400
#6FA2EC
oklch(70.7% 0.122 257.6)
-
Step 500
500
#4788E7
oklch(63% 0.158 258)
-
Step 600
600
#2770D5
oklch(55.6% 0.171 257.8)
-
Step 700
700
#195DB8
oklch(49.1% 0.159 257.7)
-
Step 800
800
#184C95
oklch(42.6% 0.132 258)
-
Step 900
900
#1A4077
oklch(37.6% 0.104 258)
-
Step 950
950 (this color)
#172D4D
oklch(29.7% 0.065 257.8)
#172D4D 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) | #1F2F4E | 0.013 |
| Deuteranopia (no green cones) | #172A4C | 0.010 |
| Tritanopia (no blue cones) | #003439 | 0.053 |
| Achromatopsia (no color) | #2D2D2D | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172D4D
#172D4D
oklch(29.7% 0.065 257.8)
- #3E2800
#3E2800
oklch(29.6% 0.062 77)
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 #172D4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.031
- Space Cadet #2B2D42 ΔE 0.034
- Marine #042E60 ΔE 0.036
- Oxford Blue #1B263B ΔE 0.036
- Gunmetal #293241 ΔE 0.040
- Midnight Green #073B4C ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.049
- Dark #1B2431 ΔE 0.054
Use #172D4D 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.