Head-to-head · Best E-Ink Tablets

Boox Note Air 4 C vs Boox Tab Ultra C Pro

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Boox Note Air 4 C comes out ahead by a clear margin (4.3 vs 3.5). The gap is mostly about Best for power users — full Android plus Kaleido 3 color — read the strengths below before deciding.

Higher ratedRanked #1 in Best E-Ink Tablets

Boox Note Air 4 C

4.3

$450as of Apr 17

The Boox Note Air 4 C is the most flexible e-ink tablet you can buy — it runs full Android so it covers reading (any app), writing (excellent native note tools), and annotation in color. PCMag and Android Central both rate it 4.5/5, the highest in this category. The tradeoff is that color E Ink dims the display versus monochrome rivals, and the Android layer is more moving parts than reMarkable's locked-down purity. Best for people who want one device to replace a Kindle + notebook + tablet.

Strengths

— Kaleido 3 color E Ink display renders illustrations and highlighted notes in muted color while keeping paper-like contrast for text
— Runs full Android 13 — any app (Kindle, Notability, OneNote, Kobo) installs from the Play Store, something reMarkable and Supernote fundamentally can't do
— Built-in front light with adjustable warm/cool temperature for reading in any lighting

Watch-outs

— Color E Ink is dimmer and lower-resolution than monochrome — text is sharper on the reMarkable 2 or Kindle Scribe
— Android layer adds complexity and occasional performance hiccups that pure e-ink devices avoid
— Battery life trails single-purpose rivals, especially with color/front-light use and Wi-Fi on

$450 · Buy at shop.boox.com Full review →

Ranked #4 in Best E-Ink Tablets

Boox Tab Ultra C Pro

3.5

$600as of Apr 17

The Boox Tab Ultra C Pro is the maximalist pick — color display, Android app store, keyboard dock, cameras — but reviewers consistently question whether the price premium is earned. PCMag (3.5/5) and TechRadar (3/5) both feel that the Note Air 4 C delivers 90% of the value for 60% of the price. Best for power users who genuinely need the extra horsepower and the laptop-hybrid form factor; most people should step down to the Note Air 4 C.

Strengths

— Fastest Boox tablet available with a Qualcomm Snapdragon 600-series SoC, 6GB RAM, and 128GB storage — handles multiple Android apps with ease
— Kaleido 3 color display plus magnetic keyboard accessory turn it into a laptop-replacement form factor
— Full Google Play Store access like the Note Air 4 C — any Android app runs

Watch-outs

— At roughly $900 it's the most expensive tablet on this list — more than twice the reMarkable 2 for a measurably worse writing experience
— PCMag's 3.5/5 and TechRadar's 3/5 both flag the price-to-value gap and inconsistent performance when many Android apps run at once
— Keyboard accessory is a paid add-on, and the laptop mode feels compromised compared to any real Windows/iPad setup

$600 · Buy at shop.boox.com Full review →

Specs side-by-side

Spec	Boox Note Air 4 C	Boox Tab Ultra C Pro
Screen	10.3" E-Ink Kaleido 3	10.3" E-Ink Kaleido 3
Resolution	300 ppi (mono)	300 ppi (mono)
Storage	64 GB	128 GB
Stylus	Pen2 Pro included	Pen Plus included
Weight	420g	480g
Battery Life	~4 weeks	~6 weeks

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