Founder @ DoublOne · a Brain Friendly Email Client · Building Intuitive, Privacy-First Products

projects

github

medium

devto

productHunt

substack

youtube

Rudi K • Peerlist

designer turned engineer turned founder

We built DoublOne because we were tired of the overload in our inboxes. Email hasn’t really changed since the 90s, and it still feels slow, cluttered, and stressful.So we reimagined it to be:<ul><li>Organized by people — no more endless threads</li><li>Chat-like — fast, natural conversations that feel more human</li><li>Minimalist — clean, distraction-free design</li><li>Powered by Aura — our AI assistant to help draft, prioritize, and reply</li><li>Privacy-first — your emails stay local, never sold or mined</li></ul>Connect your existing account in seconds (no migration headaches). Works beautifully on desktop and mobile, so your inbox feels friendly everywhere. And because it’s faster and simpler, you’ll spend less time in your inbox and more time on what matters.Since launching, we’ve seen users feel less anxious, reply to emails faster, and develop a healthier relationship with their inbox 💌It’s free, privacy-focused, and here to make email feel like a chat, but without losing the power of email.The waitlist is open, and we’re inviting a few people to test it out and share their thoughts 🙌

DoublOne

LeedPDF is an innovative PDF viewer that allows users to add drawings and notes to any PDF document. Whether you are using a mouse, touch interface, or stylus like the Apple Pencil, LeedPDF provides a seamless experience for annotating PDFs. This open-source tool is designed to be user-friendly and versatile, catering to a wide range of devices and input methods. Key features include:<ul><li>Support for mouse, touch, and stylus inputs</li><li>Easy PDF file selection and drag-and-drop functionality</li><li>Open-source and community-driven development</li></ul>LeedPDF is perfect for anyone looking to enhance their PDF viewing and annotation capabilities with ease and flexibility.

LeedPDF

CaraML is your centralized workspace to interact with multiple AI models—without the usual chaos.You get seamless access to: 🧠 GPT-4 🧠 Claude Sonnet 🧠 Gemini 🧠 LLaMA 🧠 DeepSeek …and many more, all in one place.<h3>What makes CaraML different?</h3>1. One app, all the models You no longer need 6 tabs, 6 accounts, or 6 subscriptions. CaraML brings them all together in a clean, single interface.2. Context that travels with you Unlike traditional AI chats, CaraML uses a shared knowledge base. That means when you switch between models, your past interactions and context stay intact. No need to re-explain yourself.3. Smart model selection Not sure which model to use? Flavia, our AI-powered selector, analyzes your prompt and picks the best model for the task, whether it’s writing, coding, analysis, or creative exploration.4. Flexible pricing that makes sense Stop overpaying for tools you barely use. With one subscription, you get access to both open-source and premium models, with credits that adapt based on the model you choose.CaraML is perfect for: 🧑💻 AI power users 🧑🎨 Creators who switch between tasks 👩🔬 Researchers and developers 🧠 Anyone tired of model FOMO🎯 Try CaraML and streamline your AI workflow.

CaraML

The game follows a few principles that most games completely ignore:Just four inputs. Four arrow keys control four traffic lights. That's it. No shooting, jumping, racing, flashing lights, none of the usual chaos. The game does most of the work, and you just control what matters. It's a mess you can actually manage.No time pressure. Cars wait patiently. There's no ticking clock telling you you're failing. You can pause and think, or just let your brain zone out and react.Immediate feedback. Every click does something visible right away. No complex menus, no hidden mechanics. Just clear cause and effect.Predictable chaos. Cars spawn randomly, but they follow traffic rules. It's unpredictable enough to stay interesting, but structured enough that your brain can find patterns.Small victories. Every car that makes it through safely gives you a little "+1" and a tiny burst of particles. It's like getting a high-five from the universe for doing something right.The result is something that feels active enough to engage my scattered attention, but calm enough that I don't need to stress about it. It's meditative without being boring. Tuesdae Rush is completely open source, if you're curious about the code or want to contribute, you can star the repo on GitHub.The whole thing is built with Flutter and runs on web, mobile, and desktop.I'm Rudi, founder of DoublOne (a chat-like email client), CaraML (the only AI chatbot you need), and builder of apps that improve quality of life.If you enjoyed this post or want to see what I'm working on next, you can find me on X/Twitter, Github, Linkedin or check out my site: <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="http://rudi.engineer">rudi.engineer</a>.

Tuesdae Rush

The grammar of graphics visualization library that Flutter developers have been waiting for. Finally, create beautiful data visualizations in Flutter without fighting against chart widgets or settling for web-based solutions.Cristalyse brings the power of grammar of graphics (think ggplot2) to Flutter with buttery-smooth 60fps animations and true cross-platform deployment.. Build beautiful, interactive charts with a grammar-of-graphics API. Native performance, everywhere Flutter runs. Perfect For<ul><li>Flutter developers building data-driven apps who need more than basic chart widgets</li><li>Data scientists who want to deploy interactive visualizations to mobile without learning Swift/Kotlin</li><li>Enterprise teams building dashboards that need consistent UX across all platforms</li><li>Business analysts creating professional reports with dual Y-axis charts and advanced visualizations</li></ul><h3>What You Can Build</h3>Business DashboardsRevenue vs conversion rate with dual Y-axis supportData AnalyticsInteractive scatter plots with hover tooltipsTime SeriesMulti-series line charts with smooth animationsFinancial ReportsStacked bar charts for budget breakdownsUser MetricsArea charts showing engagement over timeMobile AppsTouch-friendly charts with pan and zoom FeaturesDiscover animations, theming, and interactive capabilities<h3>Latest Release</h3>Cristalyse (data viz library for flutter) hit v0.9 and now it supports quite a lot of stuff:- 60fps native rendering that doesn't lag when you pan around like every other flutter chart lib- proper tooltips and gestures that feel smooth- works everywhere flutter does - mobile, web, desktop, even linux apparently- dual y-axis charts (finally can plot revenue vs conversion rates without wanting to throw my laptop)- all the chart types you actually need - line, area, scatter, bars (stacked, grouped, horizontal)- zero deps, just canvas. no webviews or other garbage📦 <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="https://pub.dev/packages/cristalyse">https://pub.dev/packages/cristalyse</a>📖 <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="https://docs.cristalyse.com">https://docs.cristalyse.com</a>🌐 <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="https://cristalyse.com">https://cristalyse.com</a> ✨ Why Cristalyse?Stop wrestling with limited chart libraries. Cristalyse brings the power of grammar of graphics (think ggplot2) to Flutter with buttery-smooth 60fps animations and true cross-platform deployment.<ul><li>🎨 Grammar of Graphics API - Familiar syntax if you've used ggplot2 or plotly</li><li>🚀 Native 60fps Animations - Leverages Flutter's rendering engine, not DOM manipulation</li><li>📱 True Cross-Platform - One codebase → Mobile, Web, Desktop, all looking identical</li><li>⚡ GPU-Accelerated Performance - Handle large datasets without breaking a sweat</li><li>🎯 Flutter-First Design - Seamlessly integrates with your existing Flutter apps</li><li>📊 Dual Y-Axis Support - Professional business dashboards with independent left/right scales</li><li>📈 Advanced Bar Charts - Grouped, stacked, and horizontal variations with smooth animations</li><li>👆 Interactive Charts - Engage users with tooltips, hover effects, and click events.</li></ul>🔥 Current Features<h3>✅ Chart Types</h3><ul><li>Scatter plots with size and color mapping</li><li>Line charts with multi-series support and progressive drawing</li><li>Bar charts (vertical, horizontal, grouped, stacked) with smooth animations</li><li>Dual Y-axis charts for professional business dashboards</li><li>Combined visualizations (bars + lines, points + lines, etc.)</li></ul><h3>✅ Advanced Features</h3><ul><li>Grammar of Graphics API - Familiar ggplot2-style syntax</li><li>Smooth 60fps animations with customizable timing and curves</li><li>Dual Y-axis support with independent scales and data routing</li><li>Coordinate flipping for horizontal charts</li><li>Multiple themes (Light, Dark, Solarized Light/Dark)</li><li>Custom color palettes and styling options</li><li>Responsive scaling for all screen sizes</li><li>High-DPI support for crisp visuals</li></ul><h3>✅ Data Handling</h3><ul><li>Flexible data formats - List&lt;Map&lt;String, dynamic&gt;&gt;</li><li>Mixed data types - Automatic type detection and conversion</li><li>Missing value handling - Graceful degradation for null/invalid data</li><li>Large dataset support - Optimized for 1000+ data points</li><li>Real-time updates - Smooth transitions when data changes</li></ul>📱 Platform Support ✅ iOS 12+✅ Android API 21+✅ Web (Chrome 80+, Firefox, Safari)✅ Windows 10+✅ macOS 10.14+✅ Linux (Ubuntu 18.04+)🧪 Development Status Current Version: 0.9.4 - Production ready with enhanced dual Y-axis SVG export and comprehensive interactive capabilitiesWe're shipping progressively! Each release adds new visualization types while maintaining backward compatibility.✅ v0.1.0 - Scatter plots and basic theming✅ v0.2.0 - Line charts and animations✅ v0.3.0 - Bar charts (including horizontal) and areas✅ v0.4.0 - Enhanced theming with custom colors and text styles, stacked bars✅ v0.5.0 - Dual Y-axis support and advanced bar chart variations✅ v0.6.0 - Interactive tooltips✅ v0.7.0 - Interactive panning✅ v0.8.0 - Area chart support with animations and multi-series capabilities✅ v0.9.0 - Enhanced dual Y-axis SVG export with comprehensive scale supportCristalyse: Finally, the grammar of graphics library Flutter developers deserve.

Cristalyse

Hux UI is a modern Flutter UI package with beautiful, customizable components designed for clean and consistent user interfaces.<h3>Components</h3><ul><li>HuxButton</li><li>HuxCard</li><li>HuxTextField</li><li>HuxChart</li><li>HuxContextMenu</li><li>HuxLoading</li><li>HuxTheme</li><li>HuxColors</li></ul><h3>Features</h3>🎨 Modern Design - Clean, minimal design language 🌙 Dark Mode Support - Built-in light and dark theme support 📊 Data Visualization - Beautiful animated charts for data presentation 📱 Responsive - Components adapt to different screen sizes 🎯 Customizable - Extensive customization options 🚀 Easy to Use - Simple, intuitive API🫶 Open-source | MIT License 💬 Feedback and contributions are more than welcome!