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Person
Founder & Editor
Mohammad Khwahish Siddiqui builds and maintains Internet Toolbox as a solo project, focused on fast, browser-first calculators and tools. He works with Next.js, React and TypeScript, and publishes guides only after hand-verifying every formula, rate and source they cite.
Published guides
finance
Union Budget 2025 rewrote the new tax regime, and those rules continue for FY 2026-27. Here is a plain-language comparison against the old regime for FY 2026-27 (AY 2027-28) with the revised slabs, the enhanced Section 87A rebate, worked salary examples and a decision framework.
Published 2026-09-30
technology
AI agents can do more than generate text: they can use tools, access information and take actions. Learn how they work and how to approach permissions, prompt injection and oversight.
Published 2026-09-19
calculators
A practical guide to discount percentages, final prices, stacked discounts, and checking a sale calculation.
Published 2026-09-18
finance
A plain-language guide to EMI, the standard loan payment formula, and how interest and loan tenure affect monthly payments.
Published 2026-09-18
developer
A practical guide to readable JSON, common syntax errors, and quick ways to inspect API data.
Published 2026-09-18
calculators
A practical guide to the percentage formulas people use most often, with worked examples and a quick way to check your answer.
Published 2026-09-17
Each guide follows our editorial process: primary-source research, hand-verified worked examples, a second-read review, and date-stamped updates when a cited rate or rule changes.