#151F2F
Closest named color: Dark (#1B2431). oklch(23.8% 0.034 259.6), rgb(21, 31, 47).
Aa
White text reads best on this color (16.54:1).
About this color
#151F2F is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.034 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.021 away. White text reads best on it, at 16.54:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.26:1 |
| White text | 16.54:1 |
Values
| HEX | #151F2F |
| RGB | rgb(21, 31, 47) |
| HSL | hsl(217, 38%, 13%) |
| OKLCH | oklch(23.8% 0.034 259.6) |
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 #151F2F | 16.54:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #151F2F | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #151F2F text on white | 16.54:1 | AAA | Lc 103.5 | Preferred for body text |
| #151F2F text on black | 1.26:1 | 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
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D1DAE8
oklch(88.6% 0.022 259.2)
-
Step 300
300
#B1C2DB
oklch(80.9% 0.04 257.9)
-
Step 400
400
#89A2CA
oklch(70.8% 0.065 259.7)
-
Step 500
500
#6B8ABC
oklch(63% 0.084 259.7)
-
Step 600
600
#5374A8
oklch(55.6% 0.09 259.2)
-
Step 700
700
#446190
oklch(49.1% 0.083 259.7)
-
Step 800
800
#384F75
oklch(42.7% 0.07 260.1)
-
Step 900
900
#30425E
oklch(37.7% 0.054 259)
-
Step 950
950 (this color)
#151F2F
oklch(23.8% 0.034 259.6)
#151F2F 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) | #192030 | 0.008 |
| Deuteranopia (no green cones) | #161E2F | 0.004 |
| Tritanopia (no blue cones) | #0B2225 | 0.029 |
| Achromatopsia (no color) | #1F1F1F | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151F2F
#151F2F
oklch(23.8% 0.034 259.6)
- #271D0B
#271D0B
oklch(23.8% 0.034 80.7)
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 #151F2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.021
- Rich Black #0D1B2A ΔE 0.021
- Oxford Blue #1B263B ΔE 0.032
- Jet #212529 ΔE 0.035
- Space Cadet #2B2D42 ΔE 0.068
- Rich Navy #001219 ΔE 0.072
- Navy Blue #001146 ΔE 0.073
- Gunmetal #293241 ΔE 0.077
Use #151F2F 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.