#1F4E79
Closest named color: Light Navy (#155084). oklch(41.4% 0.088 249.1), rgb(31, 78, 121).
Aa
White text reads best on this color (8.66:1).
About this color
#1F4E79 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.088 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.018 away. White text reads best on it, at 8.66:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #1F4E79 |
| RGB | rgb(31, 78, 121) |
| HSL | hsl(209, 59%, 30%) |
| OKLCH | oklch(41.4% 0.088 249.1) |
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 #1F4E79 | 8.66:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #1F4E79 | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #1F4E79 text on white | 8.66:1 | AAA | Lc 89.5 | Fine for body text |
| #1F4E79 text on black | 2.42:1 | Fails | Lc -12.8 | 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
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A8C4E1
oklch(80.9% 0.051 249.4)
-
Step 400
400
#78A5D2
oklch(70.7% 0.082 249.1)
-
Step 500
500
#548EC7
oklch(63.1% 0.106 249.4)
-
Step 600
600
#3677B3
oklch(55.5% 0.115 249.1)
-
Step 700
700
#28649A
oklch(49.1% 0.106 248.9)
-
Step 800
800 (this color)
#1F4E79
oklch(41.4% 0.088 249.1)
-
Step 900
900
#224464
oklch(37.7% 0.068 248.8)
-
Step 950
950
#15283B
oklch(27.1% 0.044 249.7)
#1F4E79 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) | #3B507B | 0.032 |
| Deuteranopia (no green cones) | #2E4878 | 0.021 |
| Tritanopia (no blue cones) | #00585E | 0.065 |
| Achromatopsia (no color) | #4B4B4B | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4E79
#1F4E79
oklch(41.4% 0.088 249.1)
- #6A4103
#6A4103
oklch(41.4% 0.089 69)
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 #1F4E79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.018
- Deep Sea Blue #015482 ΔE 0.023
- Dusk Blue #26538D ΔE 0.036
- Twilight Blue #0A437A ΔE 0.039
- Cobalt #1E488F ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.051
- YInMn Blue #415A77 ΔE 0.056
Use #1F4E79 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.