#1B4BBB
Closest named color: Blue Blue (#2242C7). oklch(45.6% 0.184 263.3), rgb(27, 75, 187).
Aa
White text reads best on this color (7.57:1).
About this color
#1B4BBB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.184 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.027 away. White text reads best on it, at 7.57:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.77:1 |
| White text | 7.57:1 |
Values
| HEX | #1B4BBB |
| RGB | rgb(27, 75, 187) |
| HSL | hsl(222, 75%, 42%) |
| OKLCH | oklch(45.6% 0.184 263.3) |
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 #1B4BBB | 7.57:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #1B4BBB | 2.77:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #1B4BBB text on white | 7.57:1 | AAA | Lc 85.6 | Fine for body text |
| #1B4BBB text on black | 2.77:1 | Fails | Lc -16.4 | 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
#DFEAFF
oklch(93.5% 0.031 263.5)
-
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
#2061FC
oklch(55.6% 0.239 263.4)
-
Step 700
700
#144FDC
oklch(49.2% 0.222 263.3)
-
Step 800
800 (this color)
#1B4BBB
oklch(45.6% 0.184 263.3)
-
Step 900
900
#163A8C
oklch(37.8% 0.143 263.3)
-
Step 950
950
#0D2352
oklch(27.1% 0.091 262.9)
#1B4BBB 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) | #005CBF | 0.042 |
| Deuteranopia (no green cones) | #004DB9 | 0.012 |
| Tritanopia (no blue cones) | #00687B | 0.143 |
| Achromatopsia (no color) | #545454 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4BBB
#1B4BBB
oklch(45.6% 0.184 263.3)
- #705100
#705100
oklch(45.6% 0.094 83)
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 #1B4BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.027
- Sapphire #2138AB ΔE 0.051
- Majorelle Blue #3F37C9 ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.070
- Cobalt #1E488F ΔE 0.071
- Blueberry #464196 ΔE 0.075
- Blurple #5539CC ΔE 0.077
- Dusk Blue #26538D ΔE 0.080
Use #1B4BBB 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.