#1F4CBC
Closest named color: Blue Blue (#2242C7). oklch(46% 0.183 263.9), rgb(31, 76, 188).
Aa
White text reads best on this color (7.45:1).
About this color
#1F4CBC is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.183 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.028 away. White text reads best on it, at 7.45:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.81:1 |
| White text | 7.45:1 |
Values
| HEX | #1F4CBC |
| RGB | rgb(31, 76, 188) |
| HSL | hsl(223, 72%, 43%) |
| OKLCH | oklch(46% 0.183 263.9) |
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 #1F4CBC | 7.45:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #1F4CBC | 2.81:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #1F4CBC text on white | 7.45:1 | AAA | Lc 85.2 | Fine for body text |
| #1F4CBC text on black | 2.81:1 | 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 700.
-
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
#A3C1FB
oklch(81% 0.089 263.3)
-
Step 400
400
#739EF9
oklch(70.8% 0.142 264)
-
Step 500
500
#4F82F6
oklch(63.1% 0.182 264)
-
Step 600
600
#3468E4
oklch(55.5% 0.197 263.9)
-
Step 700
700 (this color)
#1F4CBC
oklch(46% 0.183 263.9)
-
Step 800
800
#2147A1
oklch(42.7% 0.153 263.8)
-
Step 900
900
#203D7F
oklch(37.7% 0.117 263.8)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#1F4CBC 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) | #005DC0 | 0.042 |
| Deuteranopia (no green cones) | #004EBA | 0.014 |
| Tritanopia (no blue cones) | #00697C | 0.143 |
| Achromatopsia (no color) | #555555 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4CBC
#1F4CBC
oklch(46% 0.183 263.9)
- #715200
#715200
oklch(45.9% 0.094 83.2)
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 #1F4CBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.028
- Majorelle Blue #3F37C9 ΔE 0.053
- Sapphire #2138AB ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.068
- Cobalt #1E488F ΔE 0.073
- Blurple #5539CC ΔE 0.075
- Blueberry #464196 ΔE 0.075
- Warm Blue #4B57DB ΔE 0.076
Use #1F4CBC 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.