#17212F
Closest named color: Dark (#1B2431). oklch(24.5% 0.03 256.9), rgb(23, 33, 47).
Aa
White text reads best on this color (16.21:1).
About this color
#17212F is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.030 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.013 away. White text reads best on it, at 16.21:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.29:1 |
| White text | 16.21:1 |
Values
| HEX | #17212F |
| RGB | rgb(23, 33, 47) |
| HSL | hsl(215, 34%, 14%) |
| OKLCH | oklch(24.5% 0.03 256.9) |
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 #17212F | 16.21:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #17212F | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #17212F text on white | 16.21:1 | AAA | Lc 103.1 | Preferred for body text |
| #17212F text on black | 1.29:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B2C2D8
oklch(80.9% 0.036 256.4)
-
Step 400
400
#8AA2C5
oklch(70.6% 0.058 257.7)
-
Step 500
500
#6D8BB6
oklch(63.1% 0.074 257.4)
-
Step 600
600
#5475A2
oklch(55.6% 0.08 256.3)
-
Step 700
700
#45628B
oklch(49.2% 0.075 257.1)
-
Step 800
800
#395071
oklch(42.7% 0.062 257.4)
-
Step 900
900
#31425B
oklch(37.6% 0.048 257.9)
-
Step 950
950 (this color)
#17212F
oklch(24.5% 0.03 256.9)
#17212F 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) | #1C2230 | 0.009 |
| Deuteranopia (no green cones) | #191F2F | 0.007 |
| Tritanopia (no blue cones) | #0E2426 | 0.027 |
| Achromatopsia (no color) | #202020 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17212F
#17212F
oklch(24.5% 0.03 256.9)
- #291F0F
#291F0F
oklch(24.7% 0.031 78.3)
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 #17212F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.013
- Oxford Blue #1B263B ΔE 0.027
- Jet #212529 ΔE 0.027
- Rich Black #0D1B2A ΔE 0.028
- Space Cadet #2B2D42 ΔE 0.062
- Gunmetal #293241 ΔE 0.070
- Rich Navy #001219 ΔE 0.078
- Navy Blue #001146 ΔE 0.080
Use #17212F 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.