Onyx Boox Note Air4 C Review

The dream of a paper-like digital canvas that bursts with color is no longer a distant fantasy. Onyx Boox has been refining this vision for years, and the Note Air4 C feels like a significant step toward that future. It’s a device that promises the focus of E Ink with the versatility of a modern tablet.

The Note Air4 C continues the “Air” line’s tradition of exceptional industrial design. Its CNC-milled aluminum unibody feels every bit as premium as it looks, offering a cool, rigid frame that inspires confidence. The signature asymmetrical bezel provides a natural and comfortable grip for one-handed reading, while the device’s slim profile makes it surprisingly portable for a 10.3-inch tablet. This is a device built for professionals who appreciate clean lines and robust construction.

At its heart is the Kaleido 3 color E Ink display, the device’s main draw and its most significant compromise. For monochrome content, the 300 ppi resolution is razor-sharp, delivering crisp text that rivals the best e-readers on the market. When color is introduced, the resolution drops to 150 ppi. The result is a palette that is more pastel than vibrant, a world away from the saturated punch of an OLED screen. This isn’t a flaw but a fundamental characteristic of the technology. Where it excels is in adding context—highlighting text, displaying charts in a research paper, or rendering the panels of a graphic novel. The adjustable warm and cool frontlight ensures comfortable viewing in any environment, but like all E Ink screens, it truly shines in bright, direct light.

Performance is handled by an octa-core Qualcomm processor and 4GB of RAM, a respectable combination for an E Ink device. Navigating the Android 12 interface is generally smooth, and Boox’s Super Refresh technology offers multiple speed modes to balance ghosting against responsiveness. Page turns in ebooks and PDFs are snappy, but pushing the device with complex Android apps reveals its limits. While you can browse the web or check email, the experience is a deliberate one. The true power of its Android core is the freedom to install apps like Kindle, Kobo, OneNote, or Libby, liberating you from a single ecosystem.

The note-taking experience is superb. The included Wacom EMR stylus is responsive and accurate, with 4,096 levels of pressure sensitivity translating to a natural writing feel with minimal latency. The stock note-taking app is feature-rich, offering layers, custom templates, and robust export options. For academics, students, and professionals who annotate documents or sketch ideas, the Note Air4 C is a powerful and focused tool that genuinely feels like writing on a smart piece of paper. The addition of color, however muted, makes those annotations significantly more useful.

Ultimately, the Note Air4 C is a master of a very specific domain. It’s not an iPad killer; it’s an anti-iPad. It’s for the reader, the writer, the researcher who needs color context in their documents without the eye strain and endless distractions of a backlit LCD screen. If your workflow revolves around color-coded PDFs, digital textbooks, and handwritten notes, this device offers a unique and compelling solution that justifies its premium price. For anyone else, the compromises inherent in color E Ink may be a trade-off too far.

Where to Buy:

Check it out on Amazon