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THE STORY

A true story with two characters.

A chartered accountant who knew exactly what his practice needed. And an AI that could write it. Nobody else.

Coming soon
THE CHARTERED ACCOUNTANT
The founder
A practising chartered accountant in Kusumpura, the ancient City of Flowers, serving construction and infrastructure contractors. Decides what Corelytix must do, writes every rule in plain words with its section, and works the hard cases by hand.
› build R06: TDS due vs deducted, FY 2025-26
rules/RULES_RECON.md · 194C aggregate > ₹1,00,000
independent engine · must agree on every case
planted mistakes · every one must be caught
THE DEVELOPER
Claude Code
Anthropic's AI coding agent. Writes the code — the Tally connector, the scanners, the GST and tax engines, the audit file — and proves each piece against tests the founder can read and check.
I · THE PRACTICE

Every season, the same evenings lost.

A practice that serves contractors lives on paper: purchase bills from a hundred suppliers, bank statements from five banks, TDS cut by government departments, GST notices that arrive months after the return. The founder watched good people spend their evenings retyping bills into Tally, matching 26AS line by line, and building the same tax audit schedules again for every client.

The practice is in Kusumpura — Pushpapura, the City of Flowers — the city Megasthenes, the Greek ambassador to the Mauryan court, wrote down as Palibothra, and the Buddhist travellers Fa-Hien and Xuanzang knew as Pa-lin-fou.

The software on the market did one piece each. A scanner here, a GST tool there, an audit checklist somewhere else, each with its own copy of the client and none agreeing with the others.

II · THE DECISION

No software house. No outsourced team.

The founder decided to build the system his practice needed himself, with Claude Code as his developer. A CA knows what a file must contain; what he had never had was someone who could turn that knowledge into working software as fast as he could explain it.

“Coming soon”
III · HOW THEY WORK

The CA sets the rule. The AI does not grade its own work.

Tax software that is wrong is wrong for every client at once, and an AI that checks its own code proves nothing. So every engine in Corelytix goes through the same discipline:

The CA
Writes the rule in plain words: section, threshold, rate, the financial year it applies to, the clause it feeds.
Claude
Builds the engine. Then a second, separate Claude builds another engine from the rule alone, without seeing the first.
Both
Thousands of generated client-years with mistakes planted on purpose. Every mistake must be found, nothing else flagged, and the two engines must agree.
The CA
Checks the hand-worked cases and the law. If a single one fails, it does not ship.
IV · WHAT IT BECAME

One system for the whole firm.

What began as a bill scanner became the practice itself: data entry and Tally posting, GST and TDS desks, income-tax returns, the tax audit and the statutory audit file, financial statements and CMA reports, the document vault and client app, staff, attendance and billing. All of it on one client record, and all of it used first on the founder's own clients before it reaches yours.

See everything it does →
V · WHAT IT MEANS FOR YOU

Built by someone who signs the same reports you do.

When a rule changes in the Finance Act, the person who decides how Corelytix handles it is a practising CA with his own audits on the line. When you call, you are not speaking to a sales desk. That is the whole company: one CA, and the AI that builds with him.

What we will not compromise on

Nothing posts unchecked
Software that posts a voucher you did not check is not saving you time.
Honest gaps
Missing data is shown as missing, never as a clean result. What isn't built yet is labelled “coming”.
Your books stay yours
Data stays in your Tally company. Each firm's records are isolated on the server.
The law, cited
Every check names its section and financial year, so you can disagree with it on the merits.

Talk to the CA who built it.

Thirty minutes, on your own client's books if you like.

Book a walkthrough WhatsApp the founder
ONE CHAPTER, TOLD IN FULLA chartered accountant, an AI, and a TDS returnRead the story →