#1F4FB3
Closest named color: Blue Blue (#2242C7). oklch(45.8% 0.168 262.5), rgb(31, 79, 179).
Aa
White text reads best on this color (7.42:1).
About this color
#1F4FB3 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.168 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.043 away. White text reads best on it, at 7.42:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.82:1 |
| White text | 7.42:1 |
Values
| HEX | #1F4FB3 |
| RGB | rgb(31, 79, 179) |
| HSL | hsl(221, 70%, 41%) |
| OKLCH | oklch(45.8% 0.168 262.5) |
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 #1F4FB3 | 7.42:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #1F4FB3 | 2.82:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #1F4FB3 text on white | 7.42:1 | AAA | Lc 85.2 | Fine for body text |
| #1F4FB3 text on black | 2.82:1 | Fails | Lc -16.8 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C6DAFE
oklch(88.5% 0.054 262.2)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4481FF
oklch(63% 0.198 262.7)
-
Step 600
600
#2566F0
oklch(55.6% 0.218 262.6)
-
Step 700
700
#1854D1
oklch(49.2% 0.202 262.5)
-
Step 800
800 (this color)
#1F4FB3
oklch(45.8% 0.168 262.5)
-
Step 900
900
#183C86
oklch(37.8% 0.131 262.5)
-
Step 950
950
#0F244E
oklch(27% 0.082 262.4)
#1F4FB3 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) | #005CB6 | 0.033 |
| Deuteranopia (no green cones) | #004FB1 | 0.014 |
| Tritanopia (no blue cones) | #006879 | 0.130 |
| Achromatopsia (no color) | #555555 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4FB3
#1F4FB3
oklch(45.8% 0.168 262.5)
- #715100
#715100
oklch(45.7% 0.094 82.2)
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 #1F4FB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.043
- Sapphire #2138AB ΔE 0.056
- Cobalt #1E488F ΔE 0.060
- Dusk Blue #26538D ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.065
- Blueberry #464196 ΔE 0.067
- Denim Blue #3B5B92 ΔE 0.072
- Mid Blue #276AB3 ΔE 0.075
Use #1F4FB3 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.