#1F519D
Closest named color: Dusk Blue (#26538D). oklch(44.5% 0.135 258.9), rgb(31, 81, 157).
Aa
White text reads best on this color (7.71:1).
About this color
#1F519D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.135 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.028 away. White text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.72:1 |
| White text | 7.71:1 |
Values
| HEX | #1F519D |
| RGB | rgb(31, 81, 157) |
| HSL | hsl(216, 67%, 37%) |
| OKLCH | oklch(44.5% 0.135 258.9) |
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 #1F519D | 7.71:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #1F519D | 2.72:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #1F519D text on white | 7.71:1 | AAA | Lc 86.4 | Fine for body text |
| #1F519D text on black | 2.72:1 | Fails | Lc -15.7 | Dividers and decoration only |
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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF7
oklch(88.4% 0.045 259.9)
-
Step 300
300
#A2C2F4
oklch(80.8% 0.079 259.2)
-
Step 400
400
#6FA1EF
oklch(70.7% 0.127 259)
-
Step 500
500
#4887E9
oklch(63% 0.162 259)
-
Step 600
600
#296FD7
oklch(55.6% 0.174 258.7)
-
Step 700
700
#1C5CBB
oklch(49.1% 0.163 258.9)
-
Step 800
800 (this color)
#1F519D
oklch(44.5% 0.135 258.9)
-
Step 900
900
#1B4078
oklch(37.7% 0.105 258.7)
-
Step 950
950
#112646
oklch(27% 0.066 258.6)
#1F519D 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) | #2659A0 | 0.024 |
| Deuteranopia (no green cones) | #004D9B | 0.021 |
| Tritanopia (no blue cones) | #00636F | 0.104 |
| Achromatopsia (no color) | #535353 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F519D
#1F519D
oklch(44.5% 0.135 258.9)
- #6F4D00
#6F4D00
oklch(44.6% 0.093 79.4)
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 #1F519D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.028
- Cobalt #1E488F ΔE 0.032
- Light Navy #155084 ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.050
- Blueberry #464196 ΔE 0.056
- Twilight #4E518B ΔE 0.060
Use #1F519D 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.