惯性聚合 高效追踪和阅读你感兴趣的博客、新闻、科技资讯
阅读原文 在惯性聚合中打开

推荐订阅源

L
LangChain Blog
Security Latest
Security Latest
P
Proofpoint News Feed
GbyAI
GbyAI
PCI Perspectives
PCI Perspectives
博客园 - Franky
N
Netflix TechBlog - Medium
博客园_首页
WordPress大学
WordPress大学
K
Kaspersky official blog
CTFtime.org: upcoming CTF events
CTFtime.org: upcoming CTF events
Threat Intelligence Blog | Flashpoint
Threat Intelligence Blog | Flashpoint
Vercel News
Vercel News
T
Threatpost
The Hacker News
The Hacker News
H
Help Net Security
S
Securelist
Recent Announcements
Recent Announcements
腾讯CDC
T
Tailwind CSS Blog
Cyber Security Advisories - MS-ISAC
Cyber Security Advisories - MS-ISAC
cs.CL updates on arXiv.org
cs.CL updates on arXiv.org
Engineering at Meta
Engineering at Meta
C
Cisco Blogs
V
V2EX
C
Check Point Blog
S
Schneier on Security
Cyberwarzone
Cyberwarzone
C
Cybersecurity and Infrastructure Security Agency CISA
奇客Solidot–传递最新科技情报
奇客Solidot–传递最新科技情报
B
Blog RSS Feed
H
Hackread – Cybersecurity News, Data Breaches, AI and More
Jina AI
Jina AI
M
MIT News - Artificial intelligence
T
Threat Research - Cisco Blogs
博客园 - 叶小钗
A
Arctic Wolf
AWS News Blog
AWS News Blog
Latest news
Latest news
Martin Fowler
Martin Fowler
Recorded Future
Recorded Future
Last Week in AI
Last Week in AI
The GitHub Blog
The GitHub Blog
小众软件
小众软件
B
Blog
aimingoo的专栏
aimingoo的专栏
C
Cyber Attacks, Cyber Crime and Cyber Security
V
Visual Studio Blog
P
Palo Alto Networks Blog
Spread Privacy
Spread Privacy

DEV Community

Authentication Security Deep Dive: From Brute Force to Salted Hashing (With Java Examples) Why AI Systems Don’t Fail — They Drift Spilling beans for how i learn for exam😁"Reinforcement Learning Cheat Sheet" I Replaced Chrome with Safari for AI Browser Automation. Here's What Broke (and What Finally Worked) How Python Borrows Other People's Work The $40 Architecture: Processing 1 Billion API Requests with 99.99% Uptime Vibe Coding: A Workflow Guide (From Zero to SaaS) Most webhook security guides protect the wrong side. The scary part is delivery. Headless CMS for TanStack Start: Build a Blog with Cosmic EU Age Verification App "Hacked in 2 Minutes" — What Actually Happened Comfy Cloud’s delete function does not actually remove files Running AI Models on GPU Cloud Servers: A Beginner Guide Event-driven media intelligence with AWS Step Functions and Bedrock I scored 500 AI prompts across 8 quality dimensions — here's what broke How to Call Google Gemini API from Next.js (Free Tier, No Backend Needed) The Portal Protocol: Reclaiming Human Connection in the Age of AI How to Fix Your Team's Scattered Knowledge Problem With a Self-Hosted Forum Intro to tc Cloud Functors: A Graph-First Mental Model for the Modern Cloud Designing Multi-Tenant Backends With Both Ownership and Team Access I Built a Neumorphic CSS Library with 77+ Components — Here's What I Learned PostgreSQL Performance Optimization: Why Connection Pooling Is Critical at Scale Cómo construí un SaaS multi-rubro para gestionar expensas en Argentina con FastAPI + Vue 3 🚀 I Built an Ethical Hacking Scanner Tool – Open Source Project I Replaced /usage and /context in Claude Code With a Single Statusline A Pythonic Way to Handle Emails (IMAP/SMTP) with Auto-Discovery and AI-Ready Design I Collected 8.9 Million Polymarket Price Points — Here's What I Found About How Markets Really Move EcoTrack AI — Carbon Footprint Tracker & Dashboard Everyone's Using AI. No One Agrees How. 5 self-hosted ebook managers worth trying in 2026 Building Your First AI Agent with LangChain: From Chatbot to Autonomous Assistant Common SOC 2 Failures (Real World) Stop Vibe-Checking Your AI App: A Practical Guide to Evals How to Use SonarQube and SonarScanner Locally to Level Up Your Code Quality Your Next To-Do App Is Dead — I Replaced Mine with an OpenClaw AI Sign a Nostr event in 60 lines of Python using coincurve — no nostr-sdk, no nbxplorer, no rust toolchain ITGC Audit Explained Like You’re in Big 4 Patch Tuesday abril 2026: Microsoft parcha 163 vulnerabilidades y un zero-day en SharePoint Stop scraping everything: a better way to track competitor price changes Listing on MCPize + the Official MCP Registry while routing payments OUTSIDE the marketplace — how I kept 100% of my x402 revenue Building an AI-Powered Risk Intelligence System Using Serverless Architecture Why We Ripped Function Overloading Out of Our AI Toolchain Testing AI-Generated Code: How to Actually Know If It Works SaaS Churn Is Killing Your Business. Here Is What to Do About It (Without a Support Team) The Speed of AI Is No Longer Linear - And Self-Improving Models Are Why How to Implement RBAC for MCP Tools: A Practical Guide for Engineering Teams From Standard Quote to Persuasive Proposal: AI Automation for Arborists I built a CLI that scaffolds complete multi-tenant SaaS apps Axios CVE-2025–62718: The Silent SSRF Bug That Could Be Hiding in Your Node.js App Right Now The dashboard that ended our friendship Data Pipelines Explained Simply (and How to Build Them with Python) The Hidden Cost of AI Systems Nobody Talks About. undefined vs undeclared, and how typeof behaves Switching from file-based jobs to NATS/Kafka in Rust without changing code io_uring Adventures: Rust Servers That Love Syscalls Why Agentic AI is Killing the Traditional Database The POUR principles of web accessibility for developers and designers Quantum Neural Network 3D — A Deep Dive into Interactive WebGL Visualization How To Install Caveman In Codex On macOS And Windows Automation Pipeline Reliability: Why Your Workflow Breaks When Nobody Is Watching I Built an 'Open World' AI Coding Agent — It Works From ANY Folder From Freelancing to Product: A Tech Service Company's SaaS Transformation China's AI Giants: Adding Tencent Hunyuan & ByteDance Doubao to AI University (74 Providers) On the Vibe Coders and Their Lies clerk: Auto-Summarize Your Claude Code Sessions AI Weekly — 2026/04/10–04/17 | The Model Lockdown Is Here, but the Toolchain Is the Real Battleground AI 週報 — 2026/04/10–2026/04/17 模型封鎖潮來了,但工具鏈才是真戰場 Maybe this is how Open-Source apps are born... 🚀 Fine-Tune LLMs with LoRA and QLoRA: 2026 Guide tRPC v11 + Next.js App Router: End-to-End Type Safety Without the Boilerplate ShadCN UI in 2026: Why I Stopped Installing Component Libraries and Started Owning My Components SaaS Billing in React Server Components: Stripe + Supabase Without a Single `useEffect` Join our DEV Weekend Challenge — $1,000 in Prizes Across TEN winners! Submissions Due April 20 at 6:59 AM UTC. Implementing FSRS Spaced Repetition in Flutter + Supabase — Adding Memory Science to an AI Learning App "I Texted My Localhost From the Train — Claude Code Fixed the Bug Before I Got Home" I Built a Sales Prep AI and It Went Deeper Than Expected Design to Code #2: One JSON, Eleven Outputs Solving the 100M-Row Problem: A Summary Table Pattern for High-Volume Push Notification Logs Flutter Web With Wasm: What Actually Changes For Developers I Built 50 Royalty-Free Soundtracks for My Side Project in a Weekend Using AI Music Generation The Vibe Coding Security Checklist: 7 Things to Check Before You Ship Stop Letting Googlebot Guess Fix Your React App's SEO Right Desconstruindo o Streaming do LinkedIn: Como Criar um Engine de Extração de Vídeo de Alta Performance com HLS e FFmpeg (EDA Part-1) EDA (Exploratory Data Analysis) Explained With Real Life — Why Looking at Your Data Is the Most Important Step in Machine Learning Brand Relationship Management at Scale: Our 4-Touch Outreach System for 200+ Brands Why String.fromEnvironment() Might Return an Empty String in Dart JGuardrails 1.0.0 — Hardening Java LLM Apps Against Jailbreaks, Toxicity, and Prompt Injection Plan and Schedule a Full Week of Threads Content From One Claude Conversation Coding Cat Oran Ep3, Five Tables Changed Everything BFF模式详解:构建前后端协同的中间层 I'm done watching freelancers get buried by 200 proposals. So I'm building the alternative. This is my first post BFS Algorithm in Java Step by Step Tutorial with Examples Tracking LLM Pricing Monthly: An Open Dataset for 22 AI Models How We Measure Content ROI on a Comparison Site: Revenue Attribution Without Perfect Data Introducing Nova AI Ops: The AI-Native Operating System for SRE Teams I built a free desktop video downloader for Windows — Grabbit How Talkie OCR Helps Vision-Impaired & Dyslexic Users Read the World Around Them VRCFaceTracking安装和iPhone面捕配置教程,有bug Even CrowdStrike Can't See Your Agents The Automation Gold Rush: What n8n Workflows and Claude Are Opening Up for Developers Right Now
I Built a Free Offline-First Event Operations Platform at 13. Here's Why the Architecture Is Different.
Planit · 2026-05-24 · via DEV Community

Most event software is built around a fantasy.

The fantasy is that when you are running a real event, the WiFi works, your volunteers have personal accounts, your devices are dedicated, and nothing goes wrong at the door. Every major platform, Eventbrite, Whova, Cvent, is architected around that assumption. The server is the source of truth. Everything routes through the cloud. If the connection drops, the system stops.

I have watched that assumption fail in real environments. Lines back up. Staff switch to WhatsApp. Someone pulls out a spreadsheet. The software that was supposed to help becomes the thing people work around.

That is the problem I built PlanIt to solve.


The Wrong Abstraction

The event software industry made a decision early on. It decided that events are primarily a registration and marketing problem. So it built registration pages, ticket sales, attendee engagement tools, sponsor dashboards, and email campaigns.

Those are real problems. But they are not the problems that kill an event on the day itself.

What kills an event on the day is coordination failure. The check-in desk falls behind because a device lost connection. Staff at two entrances have different information. A volunteer cannot log in because the organiser forgot to create their account. The team is split across three WhatsApp threads trying to figure out what is happening.

Nobody built software for that layer. So I did.


What PlanIt Actually Is

PlanIt is a free hosted event operations platform. It is not trying to be Eventbrite. It is trying to be the coordination layer that makes the day itself work.

Here is what that means in practice.

Offline-First Check-In

Every device running PlanIt caches the full attendee list locally. When internet connectivity drops, check-in continues without interruption. Scans are queued locally and sync automatically the moment connection is restored. Conflict resolution handles duplicate scans across entrances.

This is not a stretch goal or a future feature. It is the foundation the system is built on, because I designed around the assumption that connectivity will fail, not that it will hold.

PIN-Based Staff Authentication

Most platforms assume staff have personal email accounts and time to set up credentials before the event. Real events do not work that way. Volunteers show up on the day. Devices get handed between people. You need someone checked in and scanning within thirty seconds of arriving.

PlanIt uses PIN-based staff login. The organiser creates staff accounts in advance with usernames and PINs. Any team member can pick up any device, enter their PIN, and be operational immediately. No email. No password reset flow. No friction at the moment friction is most expensive.

This is how POS systems work. It is how warehouse scanners work. It is how hospital shift terminals work. It is not how event software works, and it should be.

WebRTC Push-to-Talk

Coordination failure at live events is mostly a communication failure. When something goes wrong at the door, the organiser needs to reach the team instantly without leaving the check-in interface, without opening a separate app, without relying on cellular coverage.

PlanIt has a built-in push-to-talk walkie-talkie system built on WebRTC. Staff hold a button to speak. Every other connected device receives the audio in real time. It is contextual, it is inside the operational system, and it does not require a separate platform.

I am not aware of another free event tool that ships this.

Real-Time Sync Across All Devices

Every check-in is reflected instantly across every device on the network. There is no reconciliation step after the event. There is no lag between what one entrance sees and what another sees. The system maintains a single shared operational state across all connected devices simultaneously.

Bulk CSV Import and QR Codes

Inviting 500 people one at a time is not a workflow. PlanIt supports bulk guest import via CSV. Every guest receives a unique QR code tied to their record. Staff scan it at the door for instant validation. Guests need no account, no app, no login.

Seating Charts and Floor Management

Drag and drop seating map builder with live assignment. Staff can see exactly where each guest is seated at the point of check-in. Organisers can move guests in real time as the event runs.


Why This Architecture Is Different

Standard event SaaS looks like this:
Browser / App
|
Central REST API
|
Cloud Database

Everything depends on constant connectivity, authoritative server state, and centralised authentication.

PlanIt is closer to this:
Device-Local State
|
Peer / Device Sync
|
Cloud Reconciliation

Each device is partially autonomous. The cloud is a reconciliation layer, not the only source of truth. That is a fundamentally different mental model, and it changes everything about how the system behaves under real conditions.

It is closer in architecture to a multiplayer game or a realtime collaboration tool than to a traditional SaaS dashboard. That is not an accident. Events are distributed real-time systems. The software should reflect that.


What It Does Not Do

PlanIt does not have ticketing. It does not process payments. It does not have sponsor management, email marketing, or a public discovery page for paid events.

Those are deliberate omissions, not gaps. The product is focused on operational coordination, not pre-event marketing. Adding payment processing would not make it better at what it is actually for.


Where It Is Now

PlanIt is deployed and free at planitapp.onrender.com. No subscription. No per-attendee fees. No guest limits.

It is early. The UI is functional but not polished. The synchronisation logic is solid but not battle-tested at large scale. There are things I know are rough and things I have not discovered yet.

I built it alone. I am 13. I started it in the winter of 2025.

I am not writing this to impress anyone. I am writing it because the problem is real, the category is genuinely underserved, and I want people who run real events with real operational complexity to know it exists and to tell me where it breaks.

If you run events, try it. If you are a developer, the architecture is worth thinking about regardless of whether you use the product. If you have ever stood at a venue entrance watching a check-in system fail while a line builds behind you, you already understand exactly why I built this.

planitapp.onrender.com


Technical Stack

  • Frontend: React, Tailwind, PWA with service worker caching
  • Backend: Node.js, Express, MongoDB
  • Real-time: WebRTC for push-to-talk, WebSocket for live sync
  • Offline: IndexedDB for local persistence, queue-based sync on reconnect
  • Hosting: Render
  • Auth: JWT for organisers, PIN-based for staff