#1F439D
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.153 264.2), rgb(31, 67, 157).
Aa
White text reads best on this color (8.94:1).
About this color
#1F439D is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.153 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 8.94:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.34:1 |
| White text | 8.94:1 |
Values
| HEX | #1F439D |
| RGB | rgb(31, 67, 157) |
| HSL | hsl(223, 67%, 37%) |
| OKLCH | oklch(41.5% 0.153 264.2) |
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 #1F439D | 8.94:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #1F439D | 2.34:1 | Fails | Lc 14.0 | Not readable |
| #1F439D text on white | 8.94:1 | AAA | Lc 90.0 | Fine for body text |
| #1F439D text on black | 2.34:1 | Fails | Lc -12.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9DAFB
oklch(88.6% 0.049 263.7)
-
Step 300
300
#A4C0FB
oklch(80.8% 0.089 264.8)
-
Step 400
400
#739EF9
oklch(70.8% 0.142 264)
-
Step 500
500
#5082F6
oklch(63.1% 0.182 264.3)
-
Step 600
600
#3568E5
oklch(55.6% 0.198 264.2)
-
Step 700
700
#2855C7
oklch(49% 0.185 264.3)
-
Step 800
800 (this color)
#1F439D
oklch(41.5% 0.153 264.2)
-
Step 900
900
#203D80
oklch(37.8% 0.119 264)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#1F439D 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) | #004FA0 | 0.032 |
| Deuteranopia (no green cones) | #00449B | 0.017 |
| Tritanopia (no blue cones) | #005969 | 0.118 |
| Achromatopsia (no color) | #494949 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F439D
#1F439D
oklch(41.5% 0.153 264.2)
- #614700
#614700
oklch(41.5% 0.085 84.6)
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 #1F439D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Sapphire #2138AB ΔE 0.034
- Blueberry #464196 ΔE 0.049
- Dusk Blue #26538D ΔE 0.055
- Light Navy #155084 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.059
- Twilight Blue #0A437A ΔE 0.061
- Blue Blue #2242C7 ΔE 0.068
Use #1F439D 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.