#155AD1
Closest named color: Azul (#1D5DEC). oklch(50.3% 0.196 260.9), rgb(21, 90, 209).
Aa
White text reads best on this color (6.14:1).
About this color
#155AD1 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.196 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.043 away. White text reads best on it, at 6.14:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.41:1 |
| White text | 6.14:1 |
Values
| HEX | #155AD1 |
| RGB | rgb(21, 90, 209) |
| HSL | hsl(218, 82%, 45%) |
| OKLCH | oklch(50.3% 0.196 260.9) |
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 #155AD1 | 6.14:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #155AD1 | 3.41:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #155AD1 text on white | 6.14:1 | AA | Lc 79.9 | Fine for body text |
| #155AD1 text on black | 3.41:1 | AA large text | Lc -21.9 | 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
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9EC2FE
oklch(81% 0.094 260.4)
-
Step 400
400
#699FFE
oklch(70.7% 0.151 261)
-
Step 500
500
#3F83FC
oklch(63.1% 0.193 260.9)
-
Step 600
600
#1E69EB
oklch(55.6% 0.209 260.9)
-
Step 700
700 (this color)
#155AD1
oklch(50.3% 0.196 260.9)
-
Step 800
800
#1147A6
oklch(42.7% 0.163 261)
-
Step 900
900
#163D83
oklch(37.7% 0.126 261)
-
Step 950
950
#0E244D
oklch(26.9% 0.081 261.5)
#155AD1 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) | #006AD5 | 0.040 |
| Deuteranopia (no green cones) | #005ACF | 0.007 |
| Tritanopia (no blue cones) | #00788D | 0.148 |
| Achromatopsia (no color) | #616161 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155AD1
#155AD1
oklch(50.3% 0.196 260.9)
- #825D00
#825D00
oklch(50.4% 0.104 81.5)
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 #155AD1, closest first.
No curated palette has a color within ΔE 0.04 of #155AD1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.043
- Warm Blue #4B57DB ΔE 0.049
- Blue Blue #2242C7 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.060
- Neon Blue #4361EE ΔE 0.063
- Cerulean Blue #056EEE ΔE 0.065
- Mid Blue #276AB3 ΔE 0.068
- Bright Blue #0165FC ΔE 0.070
Use #155AD1 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.