#1F528C
Closest named color: Dusk Blue (#26538D). oklch(43.6% 0.11 254), rgb(31, 82, 140).
Aa
White text reads best on this color (7.94:1).
About this color
#1F528C is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.110 and its hue 254°. 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 7.94:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.94:1 |
Values
| HEX | #1F528C |
| RGB | rgb(31, 82, 140) |
| HSL | hsl(212, 64%, 34%) |
| OKLCH | oklch(43.6% 0.11 254) |
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 #1F528C | 7.94:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #1F528C | 2.64:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #1F528C text on white | 7.94:1 | AAA | Lc 87.2 | Fine for body text |
| #1F528C text on black | 2.64:1 | Fails | Lc -14.9 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C3EA
oklch(80.8% 0.065 254.3)
-
Step 400
400
#73A4E0
oklch(70.8% 0.103 254)
-
Step 500
500
#4C8CD7
oklch(63.2% 0.131 253.8)
-
Step 600
600
#2D74C4
oklch(55.6% 0.143 254)
-
Step 700
700
#1F61AA
oklch(49.1% 0.134 254.1)
-
Step 800
800 (this color)
#1F528C
oklch(43.6% 0.11 254)
-
Step 900
900
#1D426E
oklch(37.6% 0.087 254.4)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#1F528C 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) | #36568E | 0.027 |
| Deuteranopia (no green cones) | #244C8B | 0.017 |
| Tritanopia (no blue cones) | #006068 | 0.084 |
| Achromatopsia (no color) | #515151 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F528C
#1F528C
oklch(43.6% 0.11 254)
- #6F4800
#6F4800
oklch(43.5% 0.092 73.8)
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 #1F528C, 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 0.016
- Deep Sea Blue #015482 ΔE 0.024
- Cobalt #1E488F ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.042
- Twilight #4E518B ΔE 0.054
- Twilight Blue #0A437A ΔE 0.055
Use #1F528C 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.