My ideal phone case has always been two different products at once. Part of me wants a permanent E Ink panel for boarding passes, social QR codes, and a to do list that never disappears behind a lock screen. Another part wants an AI notetaker like the Plaud, with its own mic, its own record button, and reliable transcription. Until now, those wants have fought for the same patch of real estate on the back of my phone. Reetle’s SmartInk I feels like someone finally noticed that clash. Instead of asking me to choose, it fuses the two roles into a single shell. The E-Ink side handles the quiet, persistent information, while the hardware in the case listens, records, and hands everything off to the phone for syncing and AI summaries. In practice, that turns the case from decoration into the main interface for how I capture and review my day.
This approach is what makes the SmartInk I compelling. It treats the phone case as active, functional hardware rather than a passive bumper. The core insight is that the back of a phone is wasted space, a blank canvas that could be doing useful work. By integrating an E-Ink screen, Reetle creates a low-power dashboard for glanceable information. The marketing materials show exactly what you would expect: calendars, QR codes, and checklists living on a paper-like display that is always visible in sunlight. This is a familiar concept, but the execution here feels more deliberate. The screen is not just a secondary display; it is the intended output for the case’s other primary function, which is where things get really clever.
Designer: REETLE
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Input comes from a dedicated, one-press record button built right into the case’s frame. This is a critical piece of the design, as it removes all the friction of modern recording. There is no need to unlock your phone, hunt for an app, and tap a tiny on-screen icon. You just press the side of the case. That single, simple action captures audio and sends it to the companion app over Bluetooth or Wi-Fi for processing. This is the kind of tactile, immediate functionality that is often lost in software-driven devices. It turns the act of recording from a deliberate, multi-step process into a pure reflex, which is exactly what you want when an important idea strikes.
Once the audio is in the app, the system’s AI gets to work. It transcribes the speech, identifies key points, and can even generate structured to-do lists from a rambling conversation. This is where the workflow comes full circle. Those summaries and tasks can be pushed right back to the E-Ink screen, closing the loop between capture and review. A meeting’s action items can appear on the back of your phone moments after the meeting ends. This creates a powerful, self-contained ecosystem where the case captures the input and the case also displays the output, turning your entire phone into a much smarter notepad.
That E-Ink display is the centerpiece of the whole pitch. It covers nearly the entire back of the phone, acting as a persistent, low-power canvas for whatever information matters most at the moment. The use cases are immediately obvious and practical: a boarding pass that will not disappear when your battery is low, a QR code for your portfolio ready at a moment’s notice, or your daily calendar visible without a single tap. Reetle calls it a “Widget Switching Display,” which suggests a dynamic hub where you can cycle through different views, from a simple to-do list to custom artwork. Crucially, this is also where the AI-generated summaries from your recordings are meant to live, turning a static information panel into an active part of your workflow.
The case has its own power source, offering 10 hours of continuous reading or 10 hours of recording, with a standby time of seven days. That is a respectable battery budget for an accessory, and it recharges via MagSafe passthrough, which seems rather fascinating because it implies that power passes through an E-Ink display into the case – which is fairly game-changing if you ask me. I don’t think I’ve seen any device allow charging right through an existing component sitting between two charging coils. That aside, the Reetle also packs a tempered-glass back and a military-grade protective construction that keeps itself as well as your phone secure from accidental drops.
The entire UX is powered by the Reetle mobile app. This app is the command center, connecting to the case via Bluetooth and managing everything from firmware updates to AI processing. It is where you review your full transcriptions, organize your notes, and customize the widgets that appear on the E Ink display. You can choose which calendar to show, which to-do list to sync, and which images or QR codes to display. The connection uses both Bluetooth and Wi-Fi, which provides flexibility for syncing large audio files quickly when a known network is available. The success of the whole experience rests on this software being intuitive, reliable, and deeply integrated into the phone’s operating system.
What is particularly ambitious is the sheer breadth of compatibility Reetle is promising. The product is not just for the latest iPhone 17 Series. The compatibility list extends back to the iPhone 13 series, and even is compatible with the new iPhone Air (although you’re killing the Air’s appeal by mounting a thick E-Ink case on it>) The plan also includes a massive range of Android flagships from Samsung, Google, Sony, Huawei, Vivo, and others. This indicates a vision for the SmartInk I as a platform-agnostic tool, not just another Apple-centric accessory. Producing perfectly fitted cases for so many different chassis designs is a significant manufacturing challenge, but it shows a commitment to serving a much wider market.
The Reetle SmartInk I is currently on Kickstarter, where it has already flown past its initial funding goal. The early-bird price is set at about $119, with a target shipping date of February 2026. For a product category that has been largely defined by aesthetics and materials, the SmartInk I represents a genuine functional leap. It is a thoughtful synthesis of E-Ink, AI, and hardware design that re-imagines what a phone case can be. It is no longer just a protective shell; it is an active partner in managing your information and capturing your ideas. Heck, it’s probably better than any other AI accessory I’ve seen all year!
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