#171F43
Closest named color: Oxford Blue (#1B263B). oklch(25.4% 0.068 271.4), rgb(23, 31, 67).
Aa
White text reads best on this color (15.98:1).
About this color
#171F43 is a dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.068 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.031 away. White text reads best on it, at 15.98:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 15.98:1 |
Values
| HEX | #171F43 |
| RGB | rgb(23, 31, 67) |
| HSL | hsl(229, 49%, 18%) |
| OKLCH | oklch(25.4% 0.068 271.4) |
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 #171F43 | 15.98:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #171F43 | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #171F43 text on white | 15.98:1 | AAA | Lc 102.8 | Preferred for body text |
| #171F43 text on black | 1.31:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBEF6
oklch(80.8% 0.082 271.4)
-
Step 400
400
#839BF1
oklch(70.7% 0.129 271)
-
Step 500
500
#667FEC
oklch(63% 0.165 271.2)
-
Step 600
600
#5066DB
oklch(55.7% 0.18 271.4)
-
Step 700
700
#4154BE
oklch(49.2% 0.167 271.3)
-
Step 800
800
#35459A
oklch(42.7% 0.139 271.3)
-
Step 900
900
#2E3B7A
oklch(37.7% 0.108 271.6)
-
Step 950
950 (this color)
#171F43
oklch(25.4% 0.068 271.4)
#171F43 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) | #0E2444 | 0.018 |
| Deuteranopia (no green cones) | #072042 | 0.019 |
| Tritanopia (no blue cones) | #00272D | 0.061 |
| Achromatopsia (no color) | #222222 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171F43
#171F43
oklch(25.4% 0.068 271.4)
- #2C2100
#2C2100
oklch(25.4% 0.052 90.4)
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 #171F43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.031
- Dark #1B2431 ΔE 0.042
- Rich Black #0D1B2A ΔE 0.052
- Navy Blue #001146 ΔE 0.057
- Space Cadet #2B2D42 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.060
- Jet #212529 ΔE 0.060
- Marine #042E60 ΔE 0.065
Use #171F43 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.