#172F4A
Closest named color: Prussian Blue (#1D3557). oklch(30% 0.058 252.7), rgb(23, 47, 74).
Aa
White text reads best on this color (13.61:1).
About this color
#172F4A is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.058 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.030 away. White text reads best on it, at 13.61:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.54:1 |
| White text | 13.61:1 |
Values
| HEX | #172F4A |
| RGB | rgb(23, 47, 74) |
| HSL | hsl(212, 53%, 19%) |
| OKLCH | oklch(30% 0.058 252.7) |
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 #172F4A | 13.61:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #172F4A | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #172F4A text on white | 13.61:1 | AAA | Lc 100.0 | Preferred for body text |
| #172F4A text on black | 1.54:1 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A2C4EC
oklch(80.9% 0.068 252.7)
-
Step 400
400
#6DA4E3
oklch(70.6% 0.11 252.7)
-
Step 500
500
#448CDB
oklch(63.1% 0.14 252.7)
-
Step 600
600
#2074C9
oklch(55.5% 0.153 252.9)
-
Step 700
700
#1061AE
oklch(49.1% 0.142 252.9)
-
Step 800
800
#13508D
oklch(42.8% 0.117 252.7)
-
Step 900
900
#184370
oklch(37.8% 0.09 252.3)
-
Step 950
950 (this color)
#172F4A
oklch(30% 0.058 252.7)
#172F4A 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) | #23304B | 0.016 |
| Deuteranopia (no green cones) | #1D2C49 | 0.011 |
| Tritanopia (no blue cones) | #003539 | 0.046 |
| Achromatopsia (no color) | #2E2E2E | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172F4A
#172F4A
oklch(30% 0.058 252.7)
- #3F2906
#3F2906
oklch(30.1% 0.058 74.2)
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 #172F4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.030
- Space Cadet #2B2D42 ΔE 0.030
- Gunmetal #293241 ΔE 0.032
- Oxford Blue #1B263B ΔE 0.036
- Midnight Green #073B4C ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.042
- Marine #042E60 ΔE 0.042
- Dark #1B2431 ΔE 0.052
Use #172F4A 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.