The B21 is positioned as a flexible label maker for everyday organization and light business use. Its main advantage is thermal printing, which keeps maintenance simple and allows quick, clean output for pantry jars, storage bins, cables, and product packaging. Print clarity is generally strong for text and simple graphics at its stated resolution, and the app offers a broad range of templates and visual elements that make it easier to standardize labels across a home or workspace.

Setup is straightforward through the phone app, and automatic label identification helps reduce guesswork when swapping rolls. The portability is practical, with a rechargeable battery intended for several hours of intermittent printing. For desk use, the compact size is a benefit, although label alignment for smaller formats can take a bit of fiddling until the roll is seated correctly.

There are also realistic limitations. The B21 is app-dependent for most users, so the experience is tied to software design choices. Some features appear gated behind optional paid content, which can create confusion if expecting all templates and elements to be included. 

Charging behavior may also require attention, as some charging cable and power combinations do not behave consistently. Finally, long-term reliability feedback is mixed, with occasional reports of fading output or early malfunction, which makes it better suited to moderate use rather than mission-critical labeling.