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I built a System Design Simulator – drag, simulate, and break your own architectures in minutes

What you can do: Drag-and-drop common pieces: load balancer, API gateway, caches, DBs, queues, even some AI bits. Hit “Start Simulation” to see latency, error rate, throughput, cache hit rate in real time. Flip chaos switches: traffic spikes, cache-miss storms, network partitions, component crashes. Share & remix: every design gets a short link; anyone can fork it and improve. Built-in hints: it tells you if you forgot an entry point or storage. Why I made it:

五维评分

付费意愿
35
需求真实度
58
个人可落地
78
竞争空间
42
新鲜度
62

AI 分析

痛点:学习系统设计或准备面试的人,想直观感受延迟、缓存击穿、流量洪峰等架构权衡,但真实搭建基础设施成本高、周期长。

目标用户:准备系统设计面试的工程师和 CS 学生,以及做架构评审的技术团队

证据:I wanted a fast way to feel trade-offs without spinning up infra. / For interviews and design reviews, it's nice to ask "what if the cache dies?" and just click a button. / Should I add "export GIF of the run" for sharing?

变现:Freemium:基础画布免费;付费解锁高级故障场景、面试题库+标准答案对比、GIF/PDF 导出、团队空间与协作;也可做企业内训版或面试官出题版。

MVP:两周内做单页拖拽画布 + 简易排队论延迟模型(LB/App/Cache/DB 四类节点)+ 3 个混沌开关(流量尖峰、缓存击穿、节点宕机)+ 实时指标面板 + 短链分享;不做账号系统,用 localStorage 存草稿。

竞品:ByteByteGo、Educative Grokking System Design、Excalidraw、draw.io、system-design-primer、paperdraw.dev(本帖产品本身)

摘要:作者在 r/SideProject 发布 paperdraw.dev:拖拽负载均衡、网关、缓存、DB、队列等组件后点击模拟,实时查看延迟/错误率/吞吐/缓存命中率,并可打开流量尖峰、缓存击穿、网络分区等混沌开关,每个设计生成短链可 fork。作者动机是「不用真搭基础设施就能感受架构权衡」,面向面试和设计评审。全帖免费发布求反馈,未提及任何付费、定价或收入数据,付费意愿信号缺失。