Finance Tools
3 free finance tools. Browser-based. No signup. Privacy-first.
What are Finance Tools?
Zerethon's finance suite includes 3 browser-based utilities designed for everyday finance 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 Finance Tools
Compound Interest Calculator
Compound interest with any frequency plus recurring deposits — future value, interest and contributions. Client-side.
Open toolLoan / EMI Calculator
Monthly payment (EMI), total interest and total repaid for a fixed-rate loan or mortgage. Client-side.
Open toolTip & Split Calculator
Tip calculator and bill splitter — tip %, total, and per-person amounts. Client-side.
Open toolFrequently asked questions
Are these Finance tools free?
Yes. All 3 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 Finance tool?
Tweet us or open a GitHub issue. The most-requested tools enter our roadmap quarterly.
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