#1F558D
Closest named color: Dusk Blue (#26538D). oklch(44.4% 0.108 252.3), rgb(31, 85, 141).
Aa
White text reads best on this color (7.65:1).
About this color
#1F558D is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.108 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.007 away. White text reads best on it, at 7.65:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.74:1 |
| White text | 7.65:1 |
Values
| HEX | #1F558D |
| RGB | rgb(31, 85, 141) |
| HSL | hsl(211, 64%, 34%) |
| OKLCH | oklch(44.4% 0.108 252.3) |
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 #1F558D | 7.65:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #1F558D | 2.74:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #1F558D text on white | 7.65:1 | AAA | Lc 86.3 | Fine for body text |
| #1F558D text on black | 2.74:1 | Fails | Lc -15.8 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A4C4E9
oklch(80.9% 0.063 252.3)
-
Step 400
400
#71A4DE
oklch(70.6% 0.101 252.4)
-
Step 500
500
#4A8DD5
oklch(63.2% 0.129 252)
-
Step 600
600
#2A75C2
oklch(55.6% 0.14 252.4)
-
Step 700
700
#1B62A8
oklch(49.1% 0.131 252.3)
-
Step 800
800 (this color)
#1F558D
oklch(44.4% 0.108 252.3)
-
Step 900
900
#1C436D
oklch(37.7% 0.085 252.5)
-
Step 950
950
#112740
oklch(26.9% 0.055 253.1)
#1F558D 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) | #3B598F | 0.031 |
| Deuteranopia (no green cones) | #294F8C | 0.018 |
| Tritanopia (no blue cones) | #00626A | 0.081 |
| Achromatopsia (no color) | #535353 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F558D
#1F558D
oklch(44.4% 0.108 252.3)
- #734900
#734900
oklch(44.3% 0.095 71.9)
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 #1F558D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.007
- Light Navy #155084 ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.024
- Deep Sea Blue #015482 ΔE 0.024
- Denim Blue #3B5B92 ΔE 0.035
- Cobalt #1E488F ΔE 0.039
- Peacock Blue #016795 ΔE 0.052
- Twilight #4E518B ΔE 0.053
Use #1F558D 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.