#172A63
Closest named color: Marine (#042E60). oklch(30.7% 0.104 266.4), rgb(23, 42, 99).
Aa
White text reads best on this color (13.56:1).
About this color
#172A63 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.104 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.019 away. White text reads best on it, at 13.56:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.54:1 |
| White text | 13.56:1 |
Values
| HEX | #172A63 |
| RGB | rgb(23, 42, 99) |
| HSL | hsl(225, 62%, 24%) |
| OKLCH | oklch(30.7% 0.104 266.4) |
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 #172A63 | 13.56:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #172A63 | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #172A63 text on white | 13.56:1 | AAA | Lc 99.7 | Preferred for body text |
| #172A63 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#325DFF
oklch(55.6% 0.244 266.4)
-
Step 700
700
#2142ED
oklch(49% 0.254 266.4)
-
Step 800
800
#1B39BF
oklch(42.7% 0.21 266.3)
-
Step 900
900
#1A3497
oklch(37.7% 0.164 266.5)
-
Step 950
950 (this color)
#172A63
oklch(30.7% 0.104 266.4)
#172A63 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) | #003265 | 0.026 |
| Deuteranopia (no green cones) | #002B62 | 0.018 |
| Tritanopia (no blue cones) | #003842 | 0.083 |
| Achromatopsia (no color) | #2E2E2E | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172A63
#172A63
oklch(30.7% 0.104 266.4)
- #3D2D00
#3D2D00
oklch(30.7% 0.063 87.3)
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 #172A63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.019
- Marine Blue #01386A ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.044
- Midnight Blue #191970 ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.068
- Oxford Blue #1B263B ΔE 0.072
- Dark Blue Grey #1F3B4D ΔE 0.074
- Midnight Green #073B4C ΔE 0.074
Use #172A63 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.