#1F5597
Closest named color: Dusk Blue (#26538D). oklch(45% 0.122 255.5), rgb(31, 85, 151).
Aa
White text reads best on this color (7.48:1).
About this color
#1F5597 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.122 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.017 away. White text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.48:1 |
Values
| HEX | #1F5597 |
| RGB | rgb(31, 85, 151) |
| HSL | hsl(213, 66%, 36%) |
| OKLCH | oklch(45% 0.122 255.5) |
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 #1F5597 | 7.48:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #1F5597 | 2.80:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #1F5597 text on white | 7.48:1 | AAA | Lc 85.6 | Fine for body text |
| #1F5597 text on black | 2.80:1 | Fails | Lc -16.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400
#6FA3E7
oklch(70.7% 0.115 255.5)
-
Step 500
500
#478ADF
oklch(63% 0.146 255.5)
-
Step 600
600
#2772CD
oklch(55.5% 0.158 255.7)
-
Step 700
700
#195FB1
oklch(49% 0.147 255.6)
-
Step 800
800 (this color)
#1F5597
oklch(45% 0.122 255.5)
-
Step 900
900
#1A4273
oklch(37.8% 0.095 255.2)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#1F5597 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) | #345B9A | 0.028 |
| Deuteranopia (no green cones) | #1E5096 | 0.014 |
| Tritanopia (no blue cones) | #00656E | 0.094 |
| Achromatopsia (no color) | #555555 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F5597
#1F5597
oklch(45% 0.122 255.5)
- #734C00
#734C00
oklch(44.9% 0.095 75.2)
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 #1F5597, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.017
- Light Navy Blue #2E5A88 ΔE 0.034
- Light Navy #155084 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.035
- Cobalt #1E488F ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.039
- Peacock Blue #016795 ΔE 0.053
- Twilight #4E518B ΔE 0.054
Use #1F5597 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.