#172971
Closest named color: Midnight Blue (#191970). oklch(31.7% 0.126 267.6), rgb(23, 41, 113).
Aa
White text reads best on this color (13.19:1).
About this color
#172971 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.126 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.036 away. White text reads best on it, at 13.19:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.59:1 |
| White text | 13.19:1 |
Values
| HEX | #172971 |
| RGB | rgb(23, 41, 113) |
| HSL | hsl(228, 66%, 27%) |
| OKLCH | oklch(31.7% 0.126 267.6) |
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 #172971 | 13.19:1 | AAA | Lc -102.3 | Preferred for body text |
| Black text on #172971 | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #172971 text on white | 13.19:1 | AAA | Lc 99.1 | Preferred for body text |
| #172971 text on black | 1.59:1 | 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
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#567DFF
oklch(63% 0.198 267.8)
-
Step 600
600
#385BFF
oklch(55.5% 0.245 267.7)
-
Step 700
700
#2632FF
oklch(49.1% 0.287 267.6)
-
Step 800
800
#1E24D7
oklch(42.7% 0.255 267.7)
-
Step 900
900
#1929A9
oklch(37.7% 0.2 267.7)
-
Step 950
950 (this color)
#172971
oklch(31.7% 0.126 267.6)
#172971 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) | #003473 | 0.030 |
| Deuteranopia (no green cones) | #002C70 | 0.018 |
| Tritanopia (no blue cones) | #003B48 | 0.099 |
| Achromatopsia (no color) | #303030 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172971
#172971
oklch(31.7% 0.126 267.6)
- #403000
#403000
oklch(31.8% 0.065 88.4)
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 #172971, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.036
- Marine #042E60 ΔE 0.036
- Marine Blue #01386A ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.062
- Royal #0C1793 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.073
- Dark Royal Blue #02066F ΔE 0.076
- Deep Blue #040273 ΔE 0.077
Use #172971 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.