Diffyn VS Fi-Plan.in

Diffyn's answer

Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.

Fi-Plan.in's answer:

Most tools tell you what already happened. Fi-Plan is a month-by-month financial simulator for Indian salaries — it projects income, taxes, EMIs, SIPs and net worth up to 50 years, so you can see when money gets tight and when financial independence arrives. The same engine powers a free API and MCP server, so AI assistants (Claude, ChatGPT, Cursor) run the exact same numbers.

Diffyn's answer

Diffyn is the platform that specializes on both change management and multi-model analysis.

Fi-Plan.in's answer:

India-specific by design: income-tax regimes, HRA and deductions, real EMI amortization with prepayments, step-up SIPs and rupee-first reporting — modelled month by month, not year-end estimates. It answers forward-looking questions ("prepay or invest?", "when can I retire?", "what if my salary jumps 20%?") from one consistent engine. Free to start, encrypted at rest, no broker passwords.

Diffyn's answer

React, Next.js, POSTGRESQL

Fi-Plan.in's answer:

Next.js (App Router) and TypeScript, React on the front end, MongoDB for storage, and a pure TypeScript calculation engine shared by the web app, the public REST API and the MCP server. Deployed on Vercel, encrypted at rest, with OAuth and MCP for AI-assistant access.

Diffyn's answer

Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.

Fi-Plan.in's answer:

Indian salaried professionals (28–40, metro, roughly ₹12L–₹60L income) who plan seriously for FIRE/retirement, plus NRIs planning a return. Tech-comfortable users who like running real scenarios either in the app or through an AI assistant.

Diffyn's answer

I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.

Fi-Plan.in's answer:

Fi-Plan started from personal experience, not a market study. After my family's business nearly collapsed, I rebuilt my finances around a layered foundation - save first (10% emergency, 40% savings, 50% investment), funding each layer before the next, then invest. It worked, but tracking it lived in spreadsheets. So my co-founder Utkarsh Pandey and I turned that system into a product: a way to quantify exactly how much money you'll have at any point and simulate income, expenses, loans, inflation and returns month by month. That became Fi-Plan.

Fi-Plan.in's answer:

• No public customers yet -Fi-Plan is an early, free product open to individual users (personal FIRE/retirement planning).