Everything that happens between your hotkey and your solution.
Capture any coding or system design problem from your screen. Get a working solution in seconds \u2014 with the privacy, speed, and depth controls that interview prep actually requires.
One hotkey. 3–8 seconds. Done.
Press Ctrl+Alt+F (or your custom shortcut). Your screen is captured. AI vision reads the problem statement, identifies constraints, detects the language, and returns a working solution — with complexity analysis, edge cases, and your chosen verbosity level. The entire workflow happens without leaving your editor, opening a browser, or writing a prompt. Three capture methods: full screen, specific window, or clipboard text.
Typical solve time: 3–8 secondsSystem design, solved end-to-end. Not just coding.
Every other tool in this category stops at coding problems. CodeAndSystem.ai handles system design rounds from capture to structured output: requirements gathering, API design, data model, architecture walkthrough, capacity estimation, scalability analysis, and trade-off discussion. Capture a prompt from your interview screen, a whiteboard sketch, or a diagram from Excalidraw — the AI reads the visual layout and returns a structured design review.
22 system design problems in catalog — 0 competitors support system designInvisible to screen shares. Always.
On Windows 10+, CodeAndSystem.ai uses OS-level capture exclusion — the app window does not exist in the video stream that Zoom, Teams, OBS, or any recording software can see. This is not an overlay trick. The operating system itself excludes the window from capture. On macOS and Linux, a privacy overlay activates with Ctrl+Alt+P. The shield icon shows your protection status: green means fully protected, yellow means overlay active.
No competitor offers OS-level capture protectionCapture anything. Solve it in seconds.
One hotkey captures your screen. AI reads the problem and returns a working solution. No tab switching, no prompt writing, no context loss.
Full screen, window, or clipboard
Capture your entire screen with Ctrl+Alt+F, a specific window with Ctrl+Alt+W, or paste text from your clipboard with Ctrl+Alt+C. Competitors limit you to full-screen only. Multi-monitor support included.
Programmable global hotkeys
Remap every hotkey to match your muscle memory. Capture, copy solution, switch modes, toggle privacy — all from the keyboard. The app stays out of your way until you call it.
164 problems auto-detected
The Blind 75, NeetCode 150, and 22 system design problems are built in. Open a problem on LeetCode and the app detects it from your browser title — no manual tagging. Works with any coding platform.
Multi-monitor support
Capture from any monitor in your setup. Developers commonly use 2+ monitors during interviews — one for the meeting, one for the problem. The capture hotkey works across all of them.
5 models. Smart routing. No prompt engineering.
You do not pick a model or write a prompt. The app selects the right model for the task, falls back across providers automatically, and returns structured output every time.
5 models, auto-fallback across providers
5 models across OpenAI (GPT-5.2, GPT-4.1 Nano) and Anthropic (Claude Opus 4.6, Sonnet 4.5, Haiku 4.5). The app picks the best model for each problem type — coding vs. system design, simple vs. complex. If one provider is down, it falls back automatically.
Three verbosity modes
Clean gives you working code, nothing else. Normal adds a structured breakdown with complexity analysis and edge cases. Explanatory teaches line-by-line, connecting every decision to this specific problem’s constraints. Switch between captures.
Seniority level targeting
A junior engineer and a staff engineer need different explanations. Set your seniority level and the output adapts — simpler context for earlier career, nuanced trade-offs for senior roles. No other tool does this.
Time and space complexity
Every solution includes Big-O analysis — time and space — so you can discuss complexity with your interviewer without second-guessing.
Edge case identification
The AI identifies edge cases specific to each problem: empty inputs, integer overflow, single-element arrays, disconnected graphs. You see them before your interviewer brings them up.
12 programming languages
Solutions in Python, JavaScript, TypeScript, Java, C++, C, Go, Rust, Kotlin, Swift, Ruby, and Scala. Set your preferred language once — every solution uses it.
Built for the interview, not just the problem.
Solving a problem at home and solving one under a live screen share are different situations. These modes close the gap.
Live Interview Guide
A dedicated mode optimized for live interview conditions. Faster responses, minimal UI, and output structured for the pace of a real conversation with an interviewer.
Adaptive Timed Guide
Simulates timed interview conditions with adaptive pacing. The timer adjusts based on problem difficulty and your progress. Build the muscle memory of solving under pressure.
Coding and System Design modes
Toggle between coding mode and system design mode with Ctrl+Alt+M. Each mode uses different AI prompting strategies, output formats, and model routing. Separate settings and themes per mode.
Your screenshots never touch our servers.
Every screenshot goes directly from your machine to OpenAI or Anthropic. We never see, store, or process your code.
Direct-to-provider data routing
When you capture a screenshot, the API request goes directly from your device to OpenAI or Anthropic. It does not pass through our servers, our proxies, or our infrastructure. This is not a privacy policy promise — it is an architecture decision.
Bring your own API key
Optionally connect your own OpenAI or Anthropic API key in Settings. All requests flow under your provider account and your data policies. AI access is included with every plan, so BYOK is optional.
Auto-delete captured images
Captured images are sent to your AI provider for analysis, then deleted from local memory. No screenshot history is retained on disk unless you explicitly enable session history.
Shield status indicator
The shield icon in the top corner shows your protection status at a glance: green means fully protected (Windows OS-level), yellow means privacy overlay is active (macOS/Linux), red means exposed.
50 MB installed. Launches instantly. Works offline.
Built with Tauri and Rust. No Electron, no browser tab, no resource drain.
50 MB, Tauri and Rust
Not Electron. Installs in seconds, launches instantly, and uses a fraction of the memory that browser-based tools consume. You will not notice it running alongside your IDE.
macOS, Windows, and Linux
Native installers for all three operating systems. .dmg for macOS, .msi for Windows, .deb and .AppImage for Linux. Same features, same hotkeys, same workflow.
Offline grace period (6 hours)
After your session authenticates, the app works offline for 6 hours. Screen capture functions without any connection. Covers interviews and exams where connectivity is unreliable.
22 themes including accessibility variants
Gruvbox, Dracula, Nord, and 19 more. Separate themes for coding mode and system design mode. High-contrast and accessibility variants included.
Always-on-top and auto-hide
Pin the app above your editor, or set it to auto-hide after delivering a solution. It adapts to how you work, not the other way around.
Free to try. One payment when you are ready.
No subscription. No auto-renew. No credit card to start.
Free trial — 5 solutions, no card, no account
Download the app. Solve 5 real problems with full access to every feature. No credit card, no account creation. Competitors charge $30–100 before you can test them. We charge $0 until you have seen the output.
One-time pricing, not a subscription
Pick the duration that matches your interview timeline — 2 weeks, 6 weeks, 3 months, or 6 months. Pay once. Use every feature. No auto-renew, no charge three months after you have landed the job.
7-day read-only grace period
When your trial or plan expires, you get 7 days of read-only access to review your past solutions. Nothing locks immediately.
You've read the features. Now see the output.
5 solutions. Every feature unlocked. No card, no account, nothing to cancel.