#1F588B
Closest named color: Light Navy Blue (#2E5A88). oklch(45% 0.102 249.2), rgb(31, 88, 139).
Aa
White text reads best on this color (7.42:1).
About this color
#1F588B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.102 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.016 away. White text reads best on it, at 7.42:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.82:1 |
| White text | 7.42:1 |
Values
| HEX | #1F588B |
| RGB | rgb(31, 88, 139) |
| HSL | hsl(208, 64%, 33%) |
| OKLCH | oklch(45% 0.102 249.2) |
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 #1F588B | 7.42:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #1F588B | 2.82:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #1F588B text on white | 7.42:1 | AAA | Lc 85.5 | Fine for body text |
| #1F588B text on black | 2.82:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A3C4E6
oklch(80.8% 0.06 249.3)
-
Step 400
400
#71A5DA
oklch(70.6% 0.096 249.8)
-
Step 500
500
#488ED0
oklch(63.1% 0.122 249.1)
-
Step 600
600
#2677BD
oklch(55.6% 0.133 249.1)
-
Step 700
700
#1864A3
oklch(49.2% 0.123 249)
-
Step 800
800 (this color)
#1F588B
oklch(45% 0.102 249.2)
-
Step 900
900
#1B446A
oklch(37.7% 0.08 249.3)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#1F588B 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) | #405B8D | 0.035 |
| Deuteranopia (no green cones) | #31518A | 0.023 |
| Tritanopia (no blue cones) | #00646B | 0.074 |
| Achromatopsia (no color) | #555555 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F588B
#1F588B
oklch(45% 0.102 249.2)
- #774900
#774900
oklch(44.8% 0.098 69.1)
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 #1F588B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.016
- Dusk Blue #26538D ΔE 0.016
- Deep Sea Blue #015482 ΔE 0.025
- Light Navy #155084 ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.031
- Peacock Blue #016795 ΔE 0.044
- Denim #3B638C ΔE 0.045
- YInMn Blue #415A77 ΔE 0.047
Use #1F588B 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.