#1F4290
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.136 263.4), rgb(31, 66, 144).
Aa
White text reads best on this color (9.37:1).
About this color
#1F4290 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.136 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.24:1 |
| White text | 9.37:1 |
Values
| HEX | #1F4290 |
| RGB | rgb(31, 66, 144) |
| HSL | hsl(221, 65%, 34%) |
| OKLCH | oklch(40.2% 0.136 263.4) |
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 #1F4290 | 9.37:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #1F4290 | 2.24:1 | Fails | Lc 12.8 | Not readable |
| #1F4290 text on white | 9.37:1 | AAA | Lc 91.2 | Preferred for body text |
| #1F4290 text on black | 2.24:1 | Fails | Lc -11.1 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4781FF
oklch(63.2% 0.197 263.3)
-
Step 600
600
#2664F5
oklch(55.7% 0.226 263.3)
-
Step 700
700
#1A51D5
oklch(49% 0.211 263.4)
-
Step 800
800
#1744AC
oklch(42.7% 0.174 263.3)
-
Step 900
900 (this color)
#1F4290
oklch(40.2% 0.136 263.4)
-
Step 950
950
#0F2350
oklch(27% 0.087 263.6)
#1F4290 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) | #084C93 | 0.028 |
| Deuteranopia (no green cones) | #00428E | 0.018 |
| Tritanopia (no blue cones) | #005562 | 0.107 |
| Achromatopsia (no color) | #464646 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4290
#1F4290
oklch(40.2% 0.136 263.4)
- #5D4300
#5D4300
oklch(40.1% 0.082 83.4)
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 #1F4290, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.041
- Light Navy #155084 ΔE 0.047
- Sapphire #2138AB ΔE 0.050
- Blueberry #464196 ΔE 0.051
- Dusk Blue #26538D ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.060
Use #1F4290 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.