#1B50AB
Closest named color: Cobalt (#1E488F). oklch(45.3% 0.157 260.6), rgb(27, 80, 171).
Aa
White text reads best on this color (7.54:1).
About this color
#1B50AB is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.157 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.049 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #1B50AB |
| RGB | rgb(27, 80, 171) |
| HSL | hsl(218, 73%, 39%) |
| OKLCH | oklch(45.3% 0.157 260.6) |
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 #1B50AB | 7.54:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #1B50AB | 2.78:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #1B50AB text on white | 7.54:1 | AAA | Lc 85.7 | Fine for body text |
| #1B50AB text on black | 2.78:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC2FC
oklch(81% 0.091 260.4)
-
Step 400
400
#6A9FFB
oklch(70.6% 0.147 260.8)
-
Step 500
500
#4184F8
oklch(63.1% 0.187 260.6)
-
Step 600
600
#206AE7
oklch(55.6% 0.203 260.5)
-
Step 700
700
#1357C9
oklch(49% 0.189 260.7)
-
Step 800
800 (this color)
#1B50AB
oklch(45.3% 0.157 260.6)
-
Step 900
900
#173E81
oklch(37.8% 0.122 260.5)
-
Step 950
950
#0E254B
oklch(27% 0.076 259.9)
#1B50AB 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) | #095BAE | 0.029 |
| Deuteranopia (no green cones) | #004EA9 | 0.014 |
| Tritanopia (no blue cones) | #006675 | 0.120 |
| Achromatopsia (no color) | #545454 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B50AB
#1B50AB
oklch(45.3% 0.157 260.6)
- #714F00
#714F00
oklch(45.3% 0.094 80)
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 #1B50AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.049
- Dusk Blue #26538D ΔE 0.051
- Blue Blue #2242C7 ΔE 0.055
- Sapphire #2138AB ΔE 0.057
- Blueberry #464196 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.063
- Light Navy #155084 ΔE 0.065
- Light Navy Blue #2E5A88 ΔE 0.069
Use #1B50AB 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.