#1F488F
Closest named color: Cobalt (#1E488F). oklch(41.4% 0.127 260.6), rgb(31, 72, 143).
Aa
White text reads best on this color (8.81:1).
About this color
#1F488F is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.127 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.001 away. White text reads best on it, at 8.81:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #1F488F |
| RGB | rgb(31, 72, 143) |
| HSL | hsl(218, 64%, 34%) |
| OKLCH | oklch(41.4% 0.127 260.6) |
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 #1F488F | 8.81:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #1F488F | 2.38:1 | Fails | Lc 14.2 | Not readable |
| #1F488F text on white | 8.81:1 | AAA | Lc 89.8 | Fine for body text |
| #1F488F text on black | 2.38:1 | Fails | Lc -12.5 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F1
oklch(81% 0.073 260.7)
-
Step 400
400
#75A1EA
oklch(70.7% 0.118 260.2)
-
Step 500
500
#5187E4
oklch(63.1% 0.152 260.6)
-
Step 600
600
#366FD2
oklch(55.7% 0.164 260.6)
-
Step 700
700
#285CB6
oklch(49.1% 0.153 260.6)
-
Step 800
800 (this color)
#1F488F
oklch(41.4% 0.127 260.6)
-
Step 900
900
#214075
oklch(37.7% 0.098 260.4)
-
Step 950
950
#142645
oklch(27.1% 0.063 260.6)
#1F488F 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) | #1F5092 | 0.023 |
| Deuteranopia (no green cones) | #00468E | 0.019 |
| Tritanopia (no blue cones) | #005964 | 0.099 |
| Achromatopsia (no color) | #4A4A4A | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F488F
#1F488F
oklch(41.4% 0.127 260.6)
- #634500
#634500
oklch(41.3% 0.085 80.3)
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 #1F488F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.001
- Light Navy #155084 ΔE 0.032
- Dusk Blue #26538D ΔE 0.034
- Twilight Blue #0A437A ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.045
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.060
Use #1F488F 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.