Productivity Tools
6 free productivity tools. Browser-based. No signup. Privacy-first.
What are Productivity Tools?
Zerethon's productivity suite includes 6 browser-based utilities designed for everyday productivity workflows. Every tool runs entirely client-side — your input never reaches our servers.
Why client-side?
- Privacy: sensitive data (API keys, payloads, passwords) never leaves your device.
- Speed: no network round-trip — results appear as you type.
- Reliability: works offline once loaded.
- Cost: always free, no signup or rate limits.
Browse Productivity Tools
Study Tools · 4
GPA Calculator
Credit-weighted GPA on the 4.0 scale — add courses, grades and credits. Client-side; grades stay private.
Open toolGrade Calculator
Weighted grade from categories, plus “what do I need on the final”. Client-side.
Open toolRandom Group Generator
Fairly split a class or team into random groups by count or by size. Re-roll any time. Client-side.
Open toolFlashcards Maker
Build flashcard decks and study them shuffled with a score. Saved locally — no account needed.
Open toolFrequently asked questions
Are these Productivity tools free?
Yes. All 6 tools are free with no signup, no rate limits, and no ads outside footer placements.
Do these tools work offline?
Yes. Once a tool page loads, the tool itself runs in your browser without needing a network connection.
Do you log my inputs?
No. Tools run entirely client-side. Your input never leaves your browser unless a tool explicitly says it makes an API call (e.g. Open Graph Preview, which fetches a URL through our server proxy).
Can I use these tools commercially?
Yes. Outputs you generate are yours. The tools themselves are operated by Zerethon — please respect rate limits on server-backed tools.
Where can I request a new Productivity tool?
Tweet us or open a GitHub issue. The most-requested tools enter our roadmap quarterly.
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