Who is Dibbayajyoti Roy?

Dibbayajyoti Roy is a Full Stack Software Engineer based in Agartala, India, specializing in TypeScript, Rust, React, and Next.js. He works at Yupcha Softwares Pvt. Ltd building production-grade SaaS platforms and is the creator of Klinder-OSS, an open-source product analytics SDK.

What programming languages does Dibbayajyoti Roy use?

TypeScript, JavaScript (ES2023), Rust, SQL, and Python. His primary stack is React and Next.js on the frontend, Node.js and Hono on the backend, and Rust for high-performance systems. He also works with AWS Bedrock, Cloudflare Workers, and Neon Postgres.

What hackathons has Dibbayajyoti Roy won?

Winner of NITA Arjuna 2.0 National Hackathon (2025, among 200+ teams), Winner of Technovate Project Exhibition (2025), 1st Runner-Up at NITA–ISRO Space Hackathon (2024), and top 500 in the AI for Bharat hackathon (2026).

Klinder-OSS is an open-source SDK built by Dibbayajyoti Roy that unifies three jobs in a single install: typed event tracking with Zod validation, error-based session recording, and automatic email trigger workflows from product behavior. It replaces the typical PostHog + LogRocket + Customer.io stack. Edge ingestion runs on Cloudflare Workers + Queues; storage is Neon Postgres with Row-Level Security for multi-tenant isolation; the API layer is Hono. A Rust port using workers-rs is in progress targeting sub-10ms p95 latency. Live at klinder-oss.vercel.app.

diffcore is a fast WebAssembly JSON diff engine for JavaScript and TypeScript, built by Dibbayajyoti Roy in Rust and published on npm. It returns real JSON Pointer paths (RFC 6901) and decoded values — not opaque hashes — and emits standard RFC 6902 JSON Patch output, interoperable with fast-json-patch, jsondiffpatch, and any IETF-compliant consumer. It ships applyPatch and revertPatch for state sync, undo/redo, and optimistic UI, includes a React useDiff hook and a CLI, plus a streaming engine for multi-GB files. Benchmarks at 3.3 to 4.1 times optimized pure-JS diff (360–490 MB/s sustained). Runs on Node, browsers, Bun, Deno, Cloudflare Workers, Vercel Edge, Electron, and Tauri. Install: npm install diffcore. Live demo: rust-wasm-library.vercel.app.

What is AHTML (Agentic HTML)?

AHTML (Agentic HTML) is a shipped five-package npm scope built by Dibbayajyoti Roy at @ahtmljs/* (v0.2.0) for making web content cheaply consumable by AI agents. The scope ships @ahtmljs/schema (canonical semantic snapshot with RAG-ready Document.chunks, 63 tests), @ahtmljs/next (Next.js plugin emitting MCP, OpenAPI, JSON-LD, llms.txt, and the AHTML snapshot at /.well-known/ahtml.json, 38 tests), @ahtmljs/agent (typed client SDK with ETag caching, dry-run safety gates, hostile-agent regressions, 28 tests), @ahtmljs/vite (cross-framework Vite plugin with byte-identical output to the Next.js plugin, 9 tests), and @ahtmljs/langchain (LangChain.js document loader preserving citation anchors and byte ranges, 5 tests). Repo: github.com/DibbayajyotiRoy/AHTML.

What is Learning Copilot by Dibbayajyoti Roy?

Learning Copilot is an AI-powered learning assistant built by Dibbayajyoti Roy using AWS Bedrock (Nova Pro and Nova Lite), Next.js, and DynamoDB. It generates structured, level-adaptive explanations with auto-generated D2 diagrams and real-time streaming responses. It placed in the top 500 of the AI for Bharat hackathon and is live at ai-for-bharat.vercel.app.

Does Dibbayajyoti Roy have AI and machine learning experience?

Yes. Dibbayajyoti Roy has hands-on AI engineering experience including: AWS Bedrock multi-model orchestration (Nova Pro and Nova Lite) with fallback and graceful degradation, streaming inference, prompt engineering, cost-aware architecture with per-mode token budgets, and agent design. He built and shipped a production AI learning assistant placed in the top 500 of the AI for Bharat hackathon.

What are Dibbayajyoti Roy's notable projects?

Klinder-OSS (open-source product analytics SDK on Cloudflare Workers and Neon Postgres), Learning Copilot (AWS Bedrock AI assistant, top 500 AI for Bharat hackathon), BloodLink (blood donor-seeker matching platform with ~100 pilot users), and EMS (real-time Employee Management System in Rust and React).

Is Dibbayajyoti Roy eligible to work in Europe?

Yes. Dibbayajyoti Roy is eligible for the Germany Opportunity Card, EU Blue Card, and Netherlands Highly Skilled Migrant (HSM) programme.

What does Klinder-OSS replace that PostHog does not?

Klinder-OSS bundles three jobs: typed product analytics, error-based session recording, and behaviour-triggered email workflows. PostHog covers analytics and session replay but not email automation — that traditionally requires Customer.io, Loops, or Resend wired separately. With Klinder, the same event that fires a funnel can also send the email, with one SDK.

Is Klinder-OSS open source?

Yes. Klinder-OSS is MIT-licensed, source-available, and self-hostable on Cloudflare Workers + Neon Postgres or any Postgres-compatible database. PostHog is also open source (MIT for the OSS edition) but is much heavier to self-host.

How fast is Klinder ingestion?

Edge ingestion runs on Cloudflare Workers + Cloudflare Queues. The Rust port via workers-rs is targeting sub-10 ms p95 latency. PostHog Cloud routes to a regional API; ingestion latency depends on your distance from the chosen region.

Does Klinder-OSS support multi-tenant isolation?

Yes. Storage is Neon Postgres with Row-Level Security (RLS) for multi-tenant isolation, suitable for SaaS teams that need hard data boundaries between customer workspaces.

Should I move off PostHog?

No — PostHog is the right answer if you need the full product-analytics suite (funnels, retention, cohorts, feature flags, A/B testing, surveys) out of the box. Klinder-OSS is the right answer if you want one lightweight SDK that does the three jobs most early-stage SaaS teams stitch together: events, session recording on errors, and lifecycle email.

comparison · 2026

Klinder-OSS vs PostHogthree tools collapsed into one SDK

tldr

Klinder-OSS is one open-source SDK that unifies typed event tracking, error-based session recording, and behaviour-triggered email workflows — the work that normally needs PostHog + LogRocket + Customer.io stitched together. PostHog is the full product-analytics suite (funnels, flags, cohorts, experiments) and remains the right call if you need that breadth.

install

# coming soon to npm — currently demo at klinder-oss.vercel.app
npm install klinder

side by side

Feature	Klinder-OSS	PostHog
Scope	Events + session recording + email triggers in one SDK	Analytics + session replay + flags + experiments
Replaces	PostHog + LogRocket + Customer.io	Mixpanel / Amplitude / Hotjar
Install footprint	Single npm install	JS snippet + back-end API config
Event typing	Zod-validated, typed at compile time	Stringly-typed by default
Session recording trigger	Error-based (only when something breaks)	Sample-based (continuous)
Email workflows	First-class — events → email triggers	Not bundled — needs Customer.io / Loops
Ingestion runtime	Cloudflare Workers + Queues (edge)	Regional Cloud API or self-hosted ClickHouse
Storage	Neon Postgres with Row-Level Security	ClickHouse
Multi-tenant isolation	RLS-enforced	Project-level partitioning
Self-host complexity	Single Worker + Postgres	Helm chart, ClickHouse, Kafka, etc.
Rust performance path	workers-rs port, sub-10 ms p95 target	N/A
License	MIT	MIT (OSS edition)
Best for	Early-stage SaaS that wants one tool not three	Teams needing full PA suite (funnels, flags, cohorts, experiments)

example

import { klinder } from "klinder";

klinder.track("checkout_failed", {
  cartValue: 49.0,
  reason: "stripe_decline",
});
// Same call: typed event, session recording started on error,
// drip email workflow "abandoned-cart-recovery" enrolled.

when to pick what

Pick Klinder-OSS if you are an early-stage SaaS that wants events, session replay on errors, and lifecycle email behind one typed SDK on edge infrastructure you control.

Pick PostHog if you need the full product-analytics suite — feature flags, A/B experiments, cohorts, surveys — and have a team to operate ClickHouse (or are happy on PostHog Cloud).

faq

What does Klinder-OSS replace that PostHog does not?
Email automation. PostHog handles analytics and session replay; Customer.io / Loops handle behaviour-triggered email. Klinder collapses both into one SDK so the same event that fires a funnel also triggers the email.
Is Klinder-OSS self-hostable?
Yes — runs on Cloudflare Workers + Cloudflare Queues for ingestion, Neon Postgres (or any Postgres) for storage, with Hono as the API layer. MIT-licensed.
How fast is ingestion?
Edge ingestion on Cloudflare Workers. The in-progress Rust workers-rs port targets sub-10 ms p95 latency.
Should I move off PostHog?
No, if you need the full product-analytics suite. Yes, if you mostly need typed events + error-triggered session replay + lifecycle email and want to maintain one lightweight SDK instead of three vendors.

try klinder

Open the live demo → or read the project notes at /work.

Questions or want to integrate it? Get in touch.

Other comparisons: Diffcore vs jsondiffpatch · AHTML vs llms.txt · all projects

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