#1F4B73
Closest named color: Light Navy (#155084). oklch(40.2% 0.083 248.8), rgb(31, 75, 115).
Aa
White text reads best on this color (9.08:1).
About this color
#1F4B73 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.083 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.029 away. White text reads best on it, at 9.08:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.31:1 |
| White text | 9.08:1 |
Values
| HEX | #1F4B73 |
| RGB | rgb(31, 75, 115) |
| HSL | hsl(209, 58%, 29%) |
| OKLCH | oklch(40.2% 0.083 248.8) |
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 #1F4B73 | 9.08:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #1F4B73 | 2.31:1 | Fails | Lc 13.3 | Not readable |
| #1F4B73 text on white | 9.08:1 | AAA | Lc 90.6 | Preferred for body text |
| #1F4B73 text on black | 2.31:1 | Fails | Lc -11.7 | 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 800.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEB
oklch(88.5% 0.027 249.9)
-
Step 300
300
#A9C4DF
oklch(80.9% 0.048 248.4)
-
Step 400
400
#7AA5CF
oklch(70.7% 0.077 248.4)
-
Step 500
500
#578EC3
oklch(63.1% 0.099 248.8)
-
Step 600
600
#3B77B0
oklch(55.6% 0.109 249.3)
-
Step 700
700
#2C6497
oklch(49.1% 0.101 248.8)
-
Step 800
800 (this color)
#1F4B73
oklch(40.2% 0.083 248.8)
-
Step 900
900
#244462
oklch(37.7% 0.064 248.4)
-
Step 950
950
#16283A
oklch(27.1% 0.041 249.6)
#1F4B73 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) | #394D75 | 0.030 |
| Deuteranopia (no green cones) | #2D4572 | 0.021 |
| Tritanopia (no blue cones) | #005459 | 0.062 |
| Achromatopsia (no color) | #484848 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4B73
#1F4B73
oklch(40.2% 0.083 248.8)
- #653F08
#653F08
oklch(40.3% 0.083 69.2)
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 #1F4B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.029
- Deep Sea Blue #015482 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.040
- Dusk Blue #26538D ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Charcoal #264653 ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.057
Use #1F4B73 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.