#1F539D
Closest named color: Dusk Blue (#26538D). oklch(45% 0.133 258), rgb(31, 83, 157).
Aa
White text reads best on this color (7.54:1).
About this color
#1F539D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.133 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.026 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #1F539D |
| RGB | rgb(31, 83, 157) |
| HSL | hsl(215, 67%, 37%) |
| OKLCH | oklch(45% 0.133 258) |
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 #1F539D | 7.54:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #1F539D | 2.78:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #1F539D text on white | 7.54:1 | AAA | Lc 85.8 | Fine for body text |
| #1F539D text on black | 2.78:1 | Fails | Lc -16.2 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C3F3
oklch(81% 0.077 257.7)
-
Step 400
400
#6FA2ED
oklch(70.8% 0.123 257.9)
-
Step 500
500
#4788E7
oklch(63% 0.158 258)
-
Step 600
600
#2770D5
oklch(55.6% 0.171 257.8)
-
Step 700
700
#195DB9
oklch(49.1% 0.16 257.8)
-
Step 800
800 (this color)
#1F539D
oklch(45% 0.133 258)
-
Step 900
900
#1A4077
oklch(37.6% 0.104 258)
-
Step 950
950
#102646
oklch(27% 0.066 257.9)
#1F539D 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) | #2B5AA0 | 0.024 |
| Deuteranopia (no green cones) | #094F9C | 0.018 |
| Tritanopia (no blue cones) | #006570 | 0.103 |
| Achromatopsia (no color) | #545454 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F539D
#1F539D
oklch(45% 0.133 258)
- #714D00
#714D00
oklch(44.8% 0.094 77.8)
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 #1F539D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.026
- Cobalt #1E488F ΔE 0.037
- Light Navy #155084 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.049
- Twilight #4E518B ΔE 0.058
- Blueberry #464196 ΔE 0.059
Use #1F539D 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.