Most “free” web tools aren’t really free — you pay with an account, an email address, a permissions popup, or a background script quietly watching what you type. e204.store is a curated suite of everyday tools — a multi-slot clipboard, a zero-knowledge password vault, a self-destructing chat, a bridge-day holiday planner, and an ad-free technical fix library — built so everything runs entirely on your device with zero telemetry.
Solves the single-clipboard bottleneck. Keeps four independent scratchpad slots in local browser memory, with one-click case conversions, PDF whitespace repair, and Markdown stripping.
True zero-knowledge cryptographic safe. Your master password stretches through 100,000 rounds of PBKDF2 directly in browser WebCrypto API to seal secrets with military-grade AES-256-GCM.
Disappearing chat built the right way: messages exist solely between active browser memories. When the tab closes, the conversation evaporates completely with no database traces to delete.
Renders sharp, mathematical vector QR codes directly in DOM canvas. Avoids fuzzy print failures on menus, cards, and flyers with presets for instant guest Wi-Fi and address books.
Maps your country’s public holidays against your working week to locate high-leverage bridge days. Turn a Tuesday or Thursday holiday into a 4-day mini-break for just 1 day of leave.
A no-fluff technical troubleshooting library that skips the 2,000-word life story. Actionable command-line and settings steps first, technical explanation second, verified on real hardware.
Client-side computing is an objective, testable claim. Here is the exact reproduction methodology you can run inside Chrome, Firefox, or Edge to confirm zero network packets leave your computer.
Press F12 or right-click anywhere and select Inspect. Switch to the Network tab.
Click the ⊘ clear icon so the list is empty. Any background telemetry on other sites will immediately fire visible POST/PUT rows.
Click these actions to observe how our architecture executes inside browser memory without contacting servers:
Substantial, authentic technical research papers featuring custom engineering illustrations, concrete hardware benchmarks, operating system diagnostics, and local-first software architecture.
A personal account of cloud vault breaches, GPU hashcat benchmarks (164 billion MD5/sec vs 4 million PBKDF2 iterations), and why browser-native WebCrypto changes the security equation.
A methodical diagnostic investigation into standby memory stalls, SysMain disk thrashing, DWM GPU memory leaks, and three verified native PowerShell commands that actually restore performance.
An investigative walkthrough showing how everyday web tools quietly exfiltrate user text via debounced POST payloads, how to spot deceptive WebSockets, and how to verify true client isolation.
Treating 365 days as a graph optimization problem. Explains Tuesday/Thursday 4:1 leverage anomalies, holiday cluster bridging across seasons, and cognitive recovery heuristics.
A software manifesto exploring why simple utilities ballooned into 50MB subscription traps, how browser standards (IndexedDB, WebCrypto) enable zero-server longevity, and the local-first movement.
Ad-supported websites get paid for user dwell time rather than rapid solutions. We examine the economic incentives behind article padding and our anti-fluff methodology in FixLog.
Clear technical trade-offs. We avoid bloated account systems, server relays, and background analytics by choosing browser-native APIs.
| Tool Project | Execution Environment | Server Logs Created | Requires Login | What It Deliberately Doesn't Do |
|---|---|---|---|---|
| 📋 Clip Board | Client Browser Memory | 0 (None) | No | Does not sync across unrelated devices; strictly single-device storage. |
| 🔒 Vault | WebCrypto API (Client) | 0 (None) | No | Cannot reset your password. If you lose your master key, data cannot be recovered. |
| 🔥 Burn Chat | Ephemeral RAM (Client) | 0 (None) | No | No message history or search. Once the browser window closes, the chat is destroyed. |
| 🔲 QR Generator | HTML5 Vector Canvas | 0 (None) | No | Does not insert redirect intermediary URLs; prints pure direct destinations. |
| 🗓️ Holiday Planner | Client Calendar Math | 0 (None) | No | Does not interface with company HR approval software or manager approvals. |
| 🛠️ FixLog | Static Editorial Library | 0 (None) | No | Does not push third-party “PC Cleaner” downloads; relies only on native OS tools. |
