#001B3F
Closest named color: Navy Blue (#001146). oklch(22.7% 0.077 255.8), rgb(0, 27, 63).
Aa
White text reads best on this color (17.09:1).
About this color
#001B3F is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.077 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.032 away. White text reads best on it, at 17.09:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.22:1 |
| White text | 17.09:1 |
Values
| HEX | #001B3F |
| RGB | rgb(0, 27, 63) |
| HSL | hsl(214, 100%, 12%) |
| OKLCH | oklch(22.7% 0.077 255.8) |
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 #001B3F | 17.09:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #001B3F | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #001B3F text on white | 17.09:1 | AAA | Lc 103.7 | Preferred for body text |
| #001B3F text on black | 1.22:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C4DBFB
oklch(88.5% 0.051 256.7)
-
Step 300
300
#9AC3FB
oklch(80.8% 0.091 256.3)
-
Step 400
400
#5FA2FA
oklch(70.7% 0.147 255.9)
-
Step 500
500
#2B88F7
oklch(63.2% 0.187 255.7)
-
Step 600
600
#0070DE
oklch(55.7% 0.188 255.7)
-
Step 700
700
#005DBC
oklch(49% 0.167 256)
-
Step 800
800
#004C9C
oklch(42.7% 0.146 256)
-
Step 900
900
#064080
oklch(37.7% 0.121 255.7)
-
Step 950
950 (this color)
#001B3F
oklch(22.7% 0.077 255.8)
#001B3F 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) | #041F40 | 0.015 |
| Deuteranopia (no green cones) | #00193E | 0.007 |
| Tritanopia (no blue cones) | #00242A | 0.057 |
| Achromatopsia (no color) | #1C1C1C | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001B3F
#001B3F
oklch(22.7% 0.077 255.8)
- #291900
#291900
oklch(22.9% 0.048 76.8)
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 #001B3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.032
- Rich Black #0D1B2A ΔE 0.043
- Oxford Blue #1B263B ΔE 0.055
- Dark #1B2431 ΔE 0.058
- Night Blue #040348 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.068
- Dark Navy #000435 ΔE 0.071
- Jet #212529 ΔE 0.076
Use #001B3F 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.