Interview Helpers is a discreet desktop overlay that handles the three formats every tech interview falls into: coding problems (Ctrl+1 to screenshot and solve), system design (Mermaid diagrams + tradeoff analysis), and verbal theory (mic transcription + 30-second answers). Powered by GPT-5 and Claude 4.7
Free tier: 10 queries/day. Pro: $39/month for unlimited usage. Works on Windows. Invisible to screen-share.