A stylus is a pen-shaped tool used to tap, write, and draw on a touchscreen or graphics tablet. Passive styluses simply imitate a finger, while active styluses communicate with the screen and add precision features.
Why it matters
Active styluses, such as those from major tablet makers, contain electronics and sense pressure, often across thousands of levels, and sometimes tilt. This allows variable line thickness in drawing apps and natural handwriting. Some use electromagnetic resonance, so the pen needs no battery, while others use a battery and wireless links like Bluetooth for extra buttons.
Palm rejection lets you rest your hand on the screen while writing, because the system ignores touches that do not come from the pen. Compatibility is the big catch: styluses are generally tied to specific devices or standards, such as USI or a vendor's own protocol.
Example
In a note-taking app, light pressure produces a thin line and heavier pressure a thick one. Tilting the pen to the side can create a shading effect like a pencil. A simple rubber-tip passive stylus can tap buttons but offers none of that.
Common mistakes
- Buying a stylus without checking that it supports your exact device model.
- Assuming a stylus will work if the screen lacks pen support.
- Letting tips wear down; replace them before scratches appear on the glass.
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