#001F45
Closest named color: Navy Blue (#001146). oklch(24.3% 0.081 255.2), rgb(0, 31, 69).
Aa
White text reads best on this color (16.38:1).
About this color
#001F45 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.081 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.041 away. White text reads best on it, at 16.38:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.28:1 |
| White text | 16.38:1 |
Values
| HEX | #001F45 |
| RGB | rgb(0, 31, 69) |
| HSL | hsl(213, 100%, 14%) |
| OKLCH | oklch(24.3% 0.081 255.2) |
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 #001F45 | 16.38:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #001F45 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #001F45 text on white | 16.38:1 | AAA | Lc 103.0 | Preferred for body text |
| #001F45 text on black | 1.28:1 | 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
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C2DBFC
oklch(88.4% 0.053 255.4)
-
Step 300
300
#97C4FE
oklch(81% 0.096 255)
-
Step 400
400
#5AA2FD
oklch(70.6% 0.152 255.3)
-
Step 500
500
#1D87FB
oklch(63% 0.195 255.2)
-
Step 600
600
#0070DB
oklch(55.5% 0.184 255.3)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#004D9A
oklch(42.7% 0.142 255.2)
-
Step 900
900
#004081
oklch(37.7% 0.124 254.9)
-
Step 950
950 (this color)
#001F45
oklch(24.3% 0.081 255.2)
#001F45 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) | #072346 | 0.016 |
| Deuteranopia (no green cones) | #001D44 | 0.007 |
| Tritanopia (no blue cones) | #00282E | 0.060 |
| Achromatopsia (no color) | #202020 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001F45
#001F45
oklch(24.3% 0.081 255.2)
- #2E1C00
#2E1C00
oklch(24.4% 0.051 75.5)
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 #001F45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.041
- Oxford Blue #1B263B ΔE 0.047
- Rich Black #0D1B2A ΔE 0.052
- Dark #1B2431 ΔE 0.055
- Marine #042E60 ΔE 0.066
- Dark Indigo #1F0954 ΔE 0.067
- Night Blue #040348 ΔE 0.069
- Darkblue #030764 ΔE 0.073
Use #001F45 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.