Bigme B7 is a powerful 7″ color E Ink tablet that combines the functionality of an e-reader, Android tablet, and smartphone. In this review, we compare it with the previous model B751C, explore its new features like SIM support, wireless stylus, camera with OCR, and upgraded hardware.
Now, in case you’ve forgotten: Bigme is a Chinese company that specializes in devices using E Ink screens — electronic paper technology. I’ve already reviewed a few devices under this brand. Today, we’re looking at a 7-inch color e-reader, model B7. Though calling it just a “reader” isn’t quite fair — it’s really a hybrid between an e-reader, a tablet, and a smartphone.
Essentially, this is a major upgrade of Bigme’s previous model, the B751C, which I reviewed a few months ago and still use regularly for reading. Naturally, we’ll be comparing these two models side by side.
The Case
I’ve got the full set here: the device itself, a stylus, and a case.
Visually, the two devices differ slightly — the B751C is more black, while the B7 has a graphite-like finish. The cases are different too. The B751C case is black, simple, and holds the device using plastic clips. Honestly, not the best design — those clips can scratch the device or get damaged over time.
The B7 case, on the other hand, is dark blue — really beautiful, by the way — and uses magnets to hold the device in place. Much more convenient — it’s super easy to take the device in and out. The downside is that it’s a little less secure, and small metal shavings can stick to the magnets.
The new case also has a cutout for the camera, which makes sense — the B7 has a camera, and the B751C didn’t.
However, there’s no dedicated stylus holder in the new case. The stylus attaches magnetically to the side of the device, but the hold isn’t very strong — it can fall off. That’s a minus.
One plus, though: the new case’s front flap folds into a stand, which the old one couldn’t do. Overall, both cases are well-made, but if you’re buying one of these, I definitely recommend getting the official set from Bigme — it’ll be hard to find a good third-party case.
The Stylus
Both models support pressure-sensitive styluses for drawing and handwriting. Spare tips are included.
But the styluses are completely different:
The B751C stylus uses a AAAA battery and has two side buttons for switching modes.
The new B7 stylus has no buttons, except for an eraser button on the back. It’s rechargeable, no battery needed, and charges wirelessly when magnetically attached to the tablet.
Charging only works while the device is awake, not in sleep mode. There’s a little LED at the end of the stylus that lights up during charging.
I also like the shape — it’s round with one flat edge, so it won’t roll off your desk. Much nicer than the older, angular design.
SIM Support = A Phone?
Now here’s a major upgrade: the B7 supports both microSD cards AND a SIM card. Just one SIM, not dual SIM, but still — this basically turns the B7 into a 7-inch E Ink smartphone.
It supports 4G, regular phone calls, texts, and of course, mobile data.
Yes, there’s a mic and speaker, so you can technically talk through the device itself, but realistically you’d want to use a Bluetooth headset. You can also plug in a USB headset, but the USB-C port placement is awkward — it’s on the long side, and gets covered by the case when closed.
So, to charge the device or plug in something, you’ll need to fully open the case. Same issue as the B751C, but the older model’s case at least had a cutout.
⚙️ Hardware and Performance
Runs Android 14 — fresh and long-supported.
Access to Google Play Store and all Android apps.
8 GB RAM, 128 GB internal storage + microSD support.
MTK chipset — not powerful, but that’s fine, because E Ink displays are limited to ~30 FPS max. You won’t be gaming or watching videos here anyway.
In benchmark tools like AnTuTu, the device identifies as a “Big Highbake”, which is Bigme’s E Ink phone series. Again, reinforces the phone-tablet-reader hybrid identity.
Display
Uses a Kaleido 3 color E Ink display — the best available tech for color E Ink right now, though still far from perfect.
B&W mode: 1680×1264 (300 PPI)
Color mode: 840×632 (150 PPI)
Yes, resolution is halved for color, but that’s a known limitation of current E Ink tech. It’s the same screen tech used in the latest Kindle Color models.
The Camera
Not meant for photography — it’s for OCR (optical character recognition). Snap a document, and the built-in software extracts the text. Think of it like a portable FineReader.
Still, here’s a tomato pic comparison: here’s what tomatoes look like through a regular phone camera… and here’s how they look through the Bigme B7’s camera. Not too bad, actually, for E Ink.
AI and Smart Features
Includes AI tools like Bigme GPT, and because it can make calls, it supports call recording with automatic transcription — handy for work.
Battery is 3000 mAh. All essential sensors are present.
Stylus Use and Digital Paper
The old B751C stylus is not compatible with the new B7 — not at all. But the new stylus works well: precise, responsive, and pressure-sensitive. It’s great for:
Marking up documents
Handwriting
Sketching
This is perfect for modern “digital paperwork” workflows — sign directly on the screen, save, and send. No printing/scanning required. Saves time and trees.
Productivity & Comfort
Personally, I use this for:
Reading documents
Slack or chat apps
With a Bluetooth keyboard and mouse, it becomes a full productivity device — and my eyes are much happier. I spend 15+ hours a day staring at screens. E Ink makes a difference: less fatigue, fewer headaches, and less dryness.
Eventually, I’d love to get a large E Ink monitor for work, but they’re still expensive — 20-inch+ models are wildly overpriced.
Summary
This is a massive upgrade over the B751C:
Better stylus
SIM support
More RAM
A camera for OCR
Excellent case
Custom UI optimized for E Ink and touch + physical buttons
10-point multitouch screen (rare for E Ink!)
Plus, Bigme is actively improving the software with OTA updates. There’s a minor issue: current firmware fails Google’s safety check, so banking apps might have issues. No NFC, so no Google Pay anyway.
Final Verdict
If you’re choosing between the B751C and the new B7 — go with the B7, no question.
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