#1F52A5
Closest named color: Dusk Blue (#26538D). oklch(45.4% 0.145 259.8), rgb(31, 82, 165).
Aa
White text reads best on this color (7.47:1).
About this color
#1F52A5 is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.145 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.040 away. White text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.47:1 |
Values
| HEX | #1F52A5 |
| RGB | rgb(31, 82, 165) |
| HSL | hsl(217, 68%, 38%) |
| OKLCH | oklch(45.4% 0.145 259.8) |
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 #1F52A5 | 7.47:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #1F52A5 | 2.80:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #1F52A5 text on white | 7.47:1 | AAA | Lc 85.5 | Fine for body text |
| #1F52A5 text on black | 2.80:1 | Fails | Lc -16.5 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F8
oklch(80.9% 0.085 260.1)
-
Step 400
400
#6DA0F4
oklch(70.6% 0.135 260)
-
Step 500
500
#4586F0
oklch(63.1% 0.173 259.7)
-
Step 600
600
#266DDF
oklch(55.7% 0.188 259.8)
-
Step 700
700
#185AC1
oklch(49.1% 0.174 259.7)
-
Step 800
800 (this color)
#1F52A5
oklch(45.4% 0.145 259.8)
-
Step 900
900
#193F7C
oklch(37.7% 0.112 259.6)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#1F52A5 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) | #1F5BA8 | 0.025 |
| Deuteranopia (no green cones) | #004FA3 | 0.018 |
| Tritanopia (no blue cones) | #006673 | 0.112 |
| Achromatopsia (no color) | #555555 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F52A5
#1F52A5
oklch(45.4% 0.145 259.8)
- #714F00
#714F00
oklch(45.3% 0.094 80)
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 #1F52A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.040
- Cobalt #1E488F ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.052
- Light Navy #155084 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.058
- Blueberry #464196 ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.062
- Sapphire #2138AB ΔE 0.065
Use #1F52A5 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.