#1F4DB1
Closest named color: Blue Blue (#2242C7). oklch(45.2% 0.167 262.9), rgb(31, 77, 177).
Aa
White text reads best on this color (7.62:1).
About this color
#1F4DB1 is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.167 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 7.62:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.75:1 |
| White text | 7.62:1 |
Values
| HEX | #1F4DB1 |
| RGB | rgb(31, 77, 177) |
| HSL | hsl(221, 70%, 41%) |
| OKLCH | oklch(45.2% 0.167 262.9) |
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 #1F4DB1 | 7.62:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #1F4DB1 | 2.75:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #1F4DB1 text on white | 7.62:1 | AAA | Lc 85.9 | Fine for body text |
| #1F4DB1 text on black | 2.75:1 | Fails | Lc -16.2 | 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
#E0EAFD
oklch(93.5% 0.028 263.4)
-
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
#6D9EFF
oklch(70.8% 0.152 262.8)
-
Step 500
500
#4581FF
oklch(63.1% 0.198 262.9)
-
Step 600
600
#2766F0
oklch(55.7% 0.218 262.9)
-
Step 700
700
#1B53D1
oklch(49.1% 0.203 263)
-
Step 800
800 (this color)
#1F4DB1
oklch(45.2% 0.167 262.9)
-
Step 900
900
#193C85
oklch(37.7% 0.129 262.6)
-
Step 950
950
#0F244E
oklch(27% 0.082 262.4)
#1F4DB1 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) | #005BB4 | 0.036 |
| Deuteranopia (no green cones) | #004DAF | 0.015 |
| Tritanopia (no blue cones) | #006677 | 0.130 |
| Achromatopsia (no color) | #545454 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4DB1
#1F4DB1
oklch(45.2% 0.167 262.9)
- #6F5000
#6F5000
oklch(45.2% 0.093 82.7)
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 #1F4DB1, 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 0.051
- Cobalt #1E488F ΔE 0.056
- Dusk Blue #26538D ΔE 0.063
- Blueberry #464196 ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.064
- Denim Blue #3B5B92 ΔE 0.073
- Blue With A Hint Of Purple #533CC6 ΔE 0.076
Use #1F4DB1 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.