#1F558A
Closest named color: Dusk Blue (#26538D). oklch(44.2% 0.104 251.1), rgb(31, 85, 138).
Aa
White text reads best on this color (7.70:1).
About this color
#1F558A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.104 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.010 away. White text reads best on it, at 7.70:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.72:1 |
| White text | 7.70:1 |
Values
| HEX | #1F558A |
| RGB | rgb(31, 85, 138) |
| HSL | hsl(210, 63%, 33%) |
| OKLCH | oklch(44.2% 0.104 251.1) |
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 #1F558A | 7.70:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #1F558A | 2.72:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #1F558A text on white | 7.70:1 | AAA | Lc 86.4 | Fine for body text |
| #1F558A text on black | 2.72:1 | Fails | Lc -15.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#72A5DB
oklch(70.7% 0.096 250.7)
-
Step 500
500
#4B8DD2
oklch(63.1% 0.125 251.3)
-
Step 600
600
#2A76BF
oklch(55.6% 0.135 251)
-
Step 700
700
#1C63A5
oklch(49.2% 0.126 250.9)
-
Step 800
800 (this color)
#1F558A
oklch(44.2% 0.104 251.1)
-
Step 900
900
#1C436B
oklch(37.6% 0.082 251.4)
-
Step 950
950
#12283F
oklch(27.1% 0.051 251.2)
#1F558A 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) | #3C588C | 0.031 |
| Deuteranopia (no green cones) | #2C4E89 | 0.021 |
| Tritanopia (no blue cones) | #006269 | 0.078 |
| Achromatopsia (no color) | #535353 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F558A
#1F558A
oklch(44.2% 0.104 251.1)
- #734800
#734800
oklch(44.1% 0.095 70.8)
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 #1F558A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.010
- Light Navy #155084 ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.021
- Light Navy Blue #2E5A88 ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.036
- Cobalt #1E488F ΔE 0.040
- YInMn Blue #415A77 ΔE 0.051
- Peacock Blue #016795 ΔE 0.052
Use #1F558A 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.