Tools we built, free for everyone.

Libraries

• 01

  Network Chaos

  Test slow, flaky and failing APIs on a real device, including dropped AI streams and rate limits. With a QA panel, no dev tools needed.

  npm install @helder-studio/network-chaos
  • Source on GitHub
  • Package on npm
• 02

  LLM Lens

  See every AI call your app makes, on the device: model, tokens, cost, time to first token and tool calls. OpenAI, Anthropic and Gemini.

  npm install @helder-studio/llm-lens
  • Source on GitHub
  • Package on npm
• 03

  Quarantine

  An error boundary that switches off one crashing feature for one user, instead of crashing the whole app again and again.

  npm install @helder-studio/quarantine
  • Source on GitHub
  • Package on npm
• 04

  Timewarp

  Test tomorrow, another language or right-to-left without touching device settings. With pseudo-localization.

  npm install @helder-studio/timewarp
  • Source on GitHub
  • Package on npm
• 05

  A11y Lens

  See what VoiceOver and TalkBack will say, and in what order, with warnings and AI fix suggestions.

  npm install @helder-studio/a11y-lens
  • Source on GitHub
  • Package on npm
• 06

  Bug Kit

  Free bug reports with no backend: device info, logs and your dev tools’ state in one report, shared or filed as a GitHub issue.

  npm install @helder-studio/bug-kit
  • Source on GitHub
  • Package on npm
• 07

  Dev Dock

  One floating button for all your React Native dev tools, with tabs, including one to inspect and edit stored data.

  npm install @helder-studio/dev-dock
  • Source on GitHub
  • Package on npm
• 08

  Storage

  One storage interface for web, AsyncStorage and MMKV. Tiny, safe during server rendering, and it never throws.

  npm install @helder-studio/storage
  • Source on GitHub
  • Package on npm