#170721
Closest named color: Very Dark Purple (#2A0134). oklch(17.1% 0.055 310.4), rgb(23, 7, 33).
Aa
White text reads best on this color (19.28:1).
About this color
#170721 is a very dark, muted purple. In OKLCH its lightness is 17%, its chroma 0.055 and its hue 310°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Very Dark Purple (#2A0134), ΔE 0.060 away. White text reads best on it, at 19.28:1.
| Hue family | Purples |
| Lightness | very dark (17%) |
| Chroma | muted (0.055) |
| Temperature | in between |
| Nearest name | Very Dark Purple (#2A0134) |
| Black text | 1.08:1 |
| White text | 19.28:1 |
Values
| HEX | #170721 |
| RGB | rgb(23, 7, 33) |
| HSL | hsl(277, 65%, 8%) |
| OKLCH | oklch(17.1% 0.055 310.4) |
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 #170721 | 19.28:1 | AAA | Lc -107.4 | Preferred for body text |
| Black text on #170721 | 1.08:1 | Fails | Lc 0.0 | Not readable |
| #170721 text on white | 19.28:1 | AAA | Lc 105.4 | Preferred for body text |
| #170721 text on black | 1.08:1 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE7F4
oklch(93.7% 0.019 309.8)
-
Step 200
200
#E1D3EB
oklch(88.5% 0.036 311.4)
-
Step 300
300
#CEB5E1
oklch(80.9% 0.067 310.4)
-
Step 400
400
#B58ED1
oklch(70.7% 0.104 310.5)
-
Step 500
500
#A370C5
oklch(63.1% 0.134 310.7)
-
Step 600
600
#8E57B1
oklch(55.6% 0.145 310.7)
-
Step 700
700
#784799
oklch(49.1% 0.135 309.9)
-
Step 800
800
#623A7C
oklch(42.6% 0.113 310.4)
-
Step 900
900
#503364
oklch(37.8% 0.087 310.1)
-
Step 950
950 (this color)
#170721
oklch(17.1% 0.055 310.4)
#170721 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) | #010D22 | 0.049 |
| Deuteranopia (no green cones) | #050E20 | 0.042 |
| Tritanopia (no blue cones) | #160C12 | 0.039 |
| Achromatopsia (no color) | #0E0E0E | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #170721
#170721
oklch(17.1% 0.055 310.4)
- #081300
#081300
oklch(16.9% 0.046 130.8)
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 #170721, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Very Dark Purple #2A0134 ΔE 0.060
- Midnight Purple #280137 ΔE 0.060
- Rich Navy #001219 ΔE 0.062
- Almost Black #070D0D ΔE 0.063
- Midnight #03012D ΔE 0.064
- Rich Black #0D1B2A ΔE 0.067
- Dark Navy #000435 ΔE 0.071
- Dark Navy Blue #00022E ΔE 0.071
Use #170721 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.