OpenClaw: A Personal Digital Assistant AI Tool

• Platform: macOS / Windows / Linux
• Keywords: AI, Personal Assistant

@Vanilla: Over the past week, the locally self-deployed AI tool OpenClaw (originally named Clawdbot, later renamed Moltbot) has truly taken over timelines, even sparking a small wave of Mac mini purchases. Unlike traditional chatbots, OpenClaw’s biggest strengths lie in three areas: controllable privacy, freedom of model choice, and convenient invocation.

In this installment of PReview, I don’t want to dwell on dry parameters or technical principles. Instead, I’d rather talk about what OpenClaw actually is—and what it can do for your digital life.

OpenClaw is neither a simple large language model nor a plain coding CLI. It is, in essence, a local “digital life hub.” It integrates a modular architecture including Model, Agent, Skill, and MCP, and achieves cross-platform access and asynchronous scheduling through a Gateway that resides on a Mac mini or a server. No matter where you are, you can interact with it in real time through various instant messaging tools.

At the same time, all memories, file indexes, and personal habits generated within OpenClaw are stored in your own local workspace (such as Memory.md, index databases, and Skills scripts). According to the official claims, you retain full control over your data sovereignty, with no need to worry about privacy leaks.

If you happen to own a Mac mini, that’s naturally the best option—it effectively gives you a low-power personal server running 24/7, with seamless access to Apple-ecosystem-related Skills. If you don’t have a Mac mini, there’s no need to buy one specifically: cloud providers like Tencent Cloud, Alibaba Cloud, Cloudflare, and DigitalOcean all offer OpenClaw-specific server images, making one-click deployment extremely convenient.

Next, I’d like to share two real-world use cases from my recent experience with OpenClaw.

In the past, doing Vibe Coding usually meant sitting in front of desktop clients like Claude Code, Codex, Gemini CLI, or Antigravity. Now, I simply send instructions to a bot via a chat app on my phone, and OpenClaw automatically handles all the logic writing and debugging on the server side, returning the results in real time.

For example, I recently switched my primary iPhone input method to “Cang Input,” but wasn’t satisfied with its default skin. I took an existing hskin theme file and dropped it directly to the bot, asking it to precisely tweak the skin code based on my aesthetic preferences and typing habits. Once the adjustments were done, I imported the generated skin file directly on my phone—the entire process without touching a computer keyboard.

I’ve also created a personal knowledge base locally on my computer, complete with source files, indexes, and management scripts. Through OpenClaw, I can issue commands to this knowledge base remotely—whether it’s syncing newly added file indexes or invoking Python for deep full-text search, analysis, or even assisted writing, all of it can be done instantly from a mobile device. This way, I get the comprehension power of large models without uploading my private database to cloud services, truly achieving “data stays local, compute goes with you.”

For now, I’ll stop here with the introduction to OpenClaw. I plan to write a more in-depth article later to explore it in greater detail. In my view, OpenClaw’s greatest success isn’t some revolutionary technological breakthrough, but rather how precisely it captures real user needs—vastly expanding the boundaries of AI usage through its Gateway and Channels.

While there is still ongoing discussion around its local control permissions and privacy boundaries, it’s hard to deny that the world depicted in the film Her feels closer than ever. And OpenClaw might just be the first truly handy tool to help you build your own version of “Samantha.”

---

Celestia: A Universe Database You Can Freely Roam

• Platform: iOS / iPadOS / macOS / Android / Windows
• Keywords: Universe, Science Education

@大大大K: When it comes to “star map” tools, most of us probably think of apps like Stellarium. That said, Stellarium focuses more on observing the night sky from Earth’s perspective, and the sense of scale at a truly cosmic level can feel a bit limited. If what you want instead is the experience of freely roaming through space and landing on planets, then Celestia is well worth a try.

In fact, Celestia is far from a newcomer—its initial release even predates Stellarium, with mobile apps arriving around 2020. As an open-source project, it never achieved the same level of mainstream recognition as Stellarium. I only discovered Celestia recently, after being inundated with space-related short videos and wanting a more “immersive” experience.

What sets Celestia apart is that it doesn’t just let you observe the universe—it lets you move through it freely. By default, Celestia locks the view onto a celestial body itself, and swiping the screen allows you to view it from different angles. Switch from the “Object” perspective to “Camera” mode in the toolbar, and you can observe the universe in a full 360 degrees centered on your current position (though most of the time, all you’ll see is darkness). If you spot a celestial object that catches your interest, simply long-press on it to bring up a menu and select “Go To,” and Celestia will whisk you at light speed to hover above it.

Even better, Celestia offers a wealth of deeply immersive features. Take the time control function in the menu, for example: it allows you to observe changes in celestial bodies across different time scales at any speed you choose. Using the “Lambda Aurigae binary system” that I stumbled upon by chance as an example—when I cranked up the time flow to extreme speeds, I could see the two bodies performing a kind of cosmic “waltz” in space. That, in turn, sparked my curiosity about this special type of system, leading me to learn that “Castor” and the famous “Sirius” are also similar binary systems.

Beyond that, thanks to the power of the open-source community, Celestia supports a highly extensible plugin system. Whether it’s real-world spacecraft, higher-resolution nebulae and galaxy packs, or even fictional celestial bodies and spacecraft from works like 2001: A Space Odyssey and Star Trek, all of these can be loaded into Celestia. Hardcore sci-fi fans can even install script plugins and treat Celestia as a sandbox game set in space.

Overall, while Celestia may not boast a flashy UI, it offers extremely robust functionality and impressive depth. Whether you use it as a pocket science education tool or as a way to spark children’s interest in space exploration, it’s an excellent choice.

Celestia also supports a remarkably wide range of devices and platforms. On desktop, it runs on Windows, macOS, and Linux and can be downloaded from the official website, though the source code itself hasn’t seen updates for many years. On mobile, it supports Android, iOS, and even visionOS, and is still actively updated as of 2026. You can download it from the official website, Google Play, the App Store, and F-Droid.

---

Halide Mark III: A New Approach to Photographic Style

• Platform: iOS / iPadOS
• Keywords: Camera, Style Photography

@ElijahLee: The renowned mobile photography app Halide has released a public preview of Mark III, introducing a new image style system called Looks. Looks are not simple color filters; instead, they are stylistic processing methods embedded directly into the act of shooting. Unlike traditional preset filters, they capture and process the image algorithmically at the moment of exposure.

After downloading the latest version of Halide from the App Store, open the app and tap the new “③” button on the screen to switch to Mark III. The app currently offers two Looks: Process Zero II and the black-and-white film style Chroma Noir.

Process Zero II is an upgraded version of the original Process Zero. During capture, it disables all computational photography features, resulting in images with stronger contrast, finer detail, and a more natural overall look. The upgrade adds HDR support, improving performance in high-contrast scenes such as sunsets and vivid color environments, and it can also be used in conjunction with ProRAW. Of course, if you ultimately feel that HDR isn’t right for you, it can be turned off in Settings → Looks.

Mark III can also apply Process Zero II to ProRAW files, preserving both the flexibility of Apple ProRAW and the natural rendering of Process Zero. If you don’t want to completely eliminate the influence of computational photography, Mark III includes a Tone Fusion slider for this exact need. It allows you to adjust highlights and shadows, restoring detail in bright and dark areas.

Chroma Noir is a moderately high-contrast black-and-white film look designed to more faithfully simulate film characteristics. The team emphasizes that it’s not just about tonal adjustment—it also incorporates physical effects such as enhanced halation, using real-world light values to build its imaging engine.

Finally, Halide is experimenting with bringing HDR support to film simulation. Traditional film, despite its centuries-long history, has been constrained by the low dynamic range of print media, making it incapable of truly representing high dynamic range imagery. If film aesthetics don’t appeal to you but you still enjoy black-and-white photography, you can disable film simulation in the app’s settings.

Halide Mark III is expected to officially launch in the summer. What’s currently available is a public preview that can be accessed via an in-app toggle, with incomplete features and a limited selection of Looks. More carefully designed Looks will be added in the future. You can download Halide for free from the App Store, but experiencing Mark III requires a paid subscription: ¥68 per month, ¥148 per year, or ¥398 for a lifetime license.

---

Escape Launcher: A Minimalist Home Screen to Help You Escape Your Phone

• Platform: Android
• Keywords: Home Screen, Launcher

@Peggy_: Many years ago, the Android ecosystem was a vibrant landscape of diverse apps. Even within the niche of third-party launchers, there was no shortage of well-known options like Nova Launcher and Lawnchair. As Android has gradually matured and refined its own system features, however, many of these third-party launchers have faded away. In contrast, a new wave of minimalist third-party launchers—built around design philosophies entirely different from stock Android—has begun to flourish.

Escape Launcher is one such app. Its developer has been quietly updating it for over a year now. Through a series of deliberate design choices, Escape Launcher maintains minimalism in both form and function. Visually, its main screen contains nothing but a text-based list of apps. Swiping right brings up phone-wide and per-app usage statistics, while swiping left reveals the full list of installed apps.

The apps shown on Escape Launcher’s home screen are entirely user-defined. On first launch, you’re asked to select a set of essential apps to appear on the home screen, and you can add or remove apps later via settings. Other customizable options are limited to whether the time and date are displayed, and the size and style of the time. As for widgets, testing shows that Escape Launcher only supports displaying a single widget above the app list on the home screen—minimalism taken to an almost frugal extreme. Adding a widget also tends to hurt the visual balance, so it’s probably best to skip widgets altogether.

On the usage statistics screen, Escape Launcher shows your total phone usage for the day, what percentage of the day that usage represents, and whether it exceeds the app’s recommended limit. The main panel then breaks things down by individual app, using red and green arrows to clearly indicate whether usage has increased or decreased compared to the previous day. To further reduce screen time, Escape Launcher also includes an app countdown feature: when enabled, a selected app will display a countdown every time you open it, and only launch once the timer finishes.

In the app list view, while I understand the good intentions behind minimalist launchers avoiding icons altogether, searching for apps in a wall of text undeniably adds friction for users. Fortunately, Escape Launcher puts real thought into lowering that barrier. A prominent search bar makes manual searching easy, and if even tapping that feels like too much, you can enable “auto-start search” in settings. With this turned on, every swipe to the app list immediately brings up the keyboard, allowing you to type and launch apps almost instantly.

Overall, Escape Launcher’s design is clean and restrained, with built-in color themes that are easy on the eyes. Customization options are limited, but the details are thoughtfully handled—for example, long-pressing anywhere opens settings, tapping the clock jumps straight to the system clock app, and tapping the date opens your default calendar. If you’re looking for both a third-party launcher and app usage tracking in one place, Escape Launcher is well worth considering.

Escape Launcher is open source and completely free. You can download and try it via F-Droid.

---

Posturr: A Posture-Reminder Utility for Mac

• Platform: macOS
• Keywords: Posture Reminder

@化学心情下2: Perhaps because I’m fairly tall, I often find myself unconsciously hunching forward when using a computer. After years of this habit, it’s taken a toll on my neck. So the question becomes: is there a way to constantly nudge myself into maintaining proper posture while working at my desk?

Posturr is a small utility I recently discovered on GitHub that does exactly that—reminding you to sit properly while using your computer. The idea behind it is fairly simple: using Apple’s Vision framework, Posturr accesses your device’s camera to detect your posture. When you start slouching or bending forward, it immediately blurs the screen so you can’t see anything clearly. Only when you straighten up and sit properly does the screen return to normal.

On first launch, Posturr walks you through a visual calibration process for your posture. You just need to follow the on-screen instructions: when a focus point appears in one corner of the full-screen black calibration page, look at the screen and press the spacebar to complete the setup.

After that, Posturr minimizes itself to the menu bar and begins monitoring via the camera. When your posture starts to slip or you hunch forward, not only does the screen content instantly blur, but the Posturr menu bar icon also changes—from a “standing figure” to a “slipping figure”—as a clear reminder that your posture is off. If you don’t sit up straight, you won’t be able to see the screen properly. In practice, this pushed me to sit more upright just so I could see what I was doing. While it’s admittedly less comfortable than slouching forward with my neck stretched out, it feels well worth it when I think about my long-term health.

In the settings, you can also fine-tune a number of options. For the blur effect, in addition to the default Blur, you can choose Vignette (where the screen gradually darkens) or Border (where the screen edges change color). You can also enable options like automatically pausing the blur when you step away, or when your laptop display becomes the only active screen—adding a bit more flexibility and personalization.

There’s also a statistics section that shows roughly what percentage of your total computer usage time was spent with incorrect posture while detection was enabled.

Overall, Posturr has been extremely useful for someone like me who already struggles with poor posture. This kind of strong, enforced feedback helps me gradually break the habit of slouching and craning my neck while using a computer. If you’re like me and tend to sit poorly when working on a Mac, this is definitely a tool worth trying. You can download and install Posturr for free from its GitHub page.

---

Sidebar Calendar: A Sidebar Calendar Widget

• Platform: macOS
• Keywords: Calendar, Widget

@Snow: Sidebar Calendar is a desktop widget app that brings your schedule to the edge of the screen for constant visibility. Whether you’re overwhelmed by a packed workload or hopping from one online meeting to another, simply turning on your screen ensures you won’t miss important events.

Unlike typical apps that live in the menu bar or appear as desktop widgets, Sidebar Calendar places your schedule along the left or right edge of the screen. No matter what’s currently on display, clicking the corresponding screen edge reveals a vertically arranged, hour-by-hour agenda for the day, sliding out from the sidebar. From here, you can view or edit events directly, or quickly create new ones by click-dragging to select a time range. To provide clearer reminders, the app also shows explicit text prompts in the menu bar while an event is in progress.

Right-click within the agenda to open the settings panel, and enable “Settings – Display Reminders” to manage your to-dos for the day directly in the schedule view. The app automatically pulls relevant items from the system Reminders. Double-clicking an empty spot on the timeline lets you quickly add a to-do with the selected time set as its deadline.

In the app’s settings, beyond toggling whether to display to-dos, you can customize theme colors, time formats, hide/show behavior, interface width, keyboard shortcuts, and more. For better schedule awareness, I recommend enabling “Settings – Collapsed Calendar” and “Time Indicator.” The former condenses your events into semi-transparent colored bars pinned to the screen edge, while the latter adds a red time line to clearly show the current moment. Used together, a quick glance at your screen is enough to understand your schedule’s progress and what’s already been completed—helping you avoid missing important tasks.

Sidebar Calendar is currently priced at ¥38 and is available for download on the App Store.

App News

Google has recently and unexpectedly leaked a preview of the interface for Aluminium OS, a new desktop operating system based on Android and ChromeOS. The preview showcases a multi-window environment and a taskbar-style interface. The system is reportedly expected to see an official release in 2026. Source