#1F429A
Closest named color: Cobalt (#1E488F). oklch(41% 0.15 264.3), rgb(31, 66, 154).
Aa
White text reads best on this color (9.11:1).
About this color
#1F429A is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.150 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 9.11:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #1F429A |
| RGB | rgb(31, 66, 154) |
| HSL | hsl(223, 66%, 36%) |
| OKLCH | oklch(41% 0.15 264.3) |
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 #1F429A | 9.11:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #1F429A | 2.30:1 | Fails | Lc 13.5 | Not readable |
| #1F429A text on white | 9.11:1 | AAA | Lc 90.5 | Preferred for body text |
| #1F429A text on black | 2.30:1 | Fails | Lc -11.8 | 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
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9D9FA
oklch(88.4% 0.049 264.9)
-
Step 300
300
#A4C0FA
oklch(80.8% 0.088 264.5)
-
Step 400
400
#749EF8
oklch(70.8% 0.14 264.2)
-
Step 500
500
#5182F4
oklch(63% 0.179 264.4)
-
Step 600
600
#3768E3
oklch(55.5% 0.195 264.5)
-
Step 700
700
#2A56C5
oklch(49.1% 0.18 264.3)
-
Step 800
800 (this color)
#1F429A
oklch(41% 0.15 264.3)
-
Step 900
900
#213D7F
oklch(37.8% 0.117 264.2)
-
Step 950
950
#14244A
oklch(27% 0.074 264.7)
#1F429A 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) | #004E9D | 0.032 |
| Deuteranopia (no green cones) | #004398 | 0.017 |
| Tritanopia (no blue cones) | #005867 | 0.117 |
| Achromatopsia (no color) | #484848 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F429A
#1F429A
oklch(41% 0.15 264.3)
- #604600
#604600
oklch(41.1% 0.084 84.3)
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 #1F429A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Sapphire #2138AB ΔE 0.036
- Blueberry #464196 ΔE 0.049
- Dusk Blue #26538D ΔE 0.055
- Light Navy #155084 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.069
Use #1F429A 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.