AI Product · 2026

Vigyan

A multi-model AI chat workspace. Ask once and get answers from as many AI models as you like, side by side. Every model shares the same conversation context, and you keep the best answer each turn. The app brings the free models on OpenRouter into one place.

Try it free →View on GitHub ↗Back to projects

One question answered by three AI models side by side, with the best answer picked

Any number of modelsAnswer every question side by side, scrolling sideways

5 free messagesTo try it with no key, then bring your own OpenRouter key

2,000+ reviewsOf ChatGPT, Claude and Perplexity analyzed to set priorities

The problem

No single model wins every task.

People switch between ChatGPT, Claude and other apps to get a second opinion. Each switch loses the conversation, and paying for several subscriptions adds up.

I analyzed 2,000+ US App Store reviews of ChatGPT, Claude and Perplexity. Among detailed negative reviews, the top complaints were usage limits and cost (21%), wrong answers (19%) and lost context (16%). Cost was also the most common reason people gave for leaving.

What it does

One conversation, many models.

Side-by-side answers

Any number of models answer together, with extra columns scrolling sideways. Pick the best answer, reply to one model, or ask just some of them.

Shared context and memory

Every model sees the whole conversation, sized to fit its limit, with older turns summarized. Pin key facts so they stay in every model's context.

Free models in one place

The model list syncs live from OpenRouter. A "Free and best" option picks strong free models from different providers.

Built-in reliability

When a model is rate limited, the app switches to the next best one and tells you. Every answer shows tokens, cost and speed.

Model comparison

Your picks build a personal leaderboard of win rate, head-to-head results, speed and failures, so you choose models on evidence.

AI agents

Describe what to track in plain English: price drops, page changes, news or job openings. Agents check on a schedule and alert you.

Assistants for your own documents

Upload your documents, test how well an AI answers from them against 15 quality checks, then put a cited chat box on your website with one line of code. It says "I don't know" instead of guessing.

Inside the app

See it in action.

Vigyan chat: three free models answer an AI PM interview question side by side; Gemma is rate limited and the app switched to another free model automatically — **One question, several models.** Each model answers side by side. When Gemma was rate limited, the app switched to another free model and said so.

Compare models page with catalog facts and how each model did in your own chats — **Compare models.** Catalog facts next to your own results: picks, speed and failures.

Agents page for job openings, news, price drops and page changes — **AI agents.** Describe what to track in plain English, and get alerts on a schedule.

How to try it

Free to start, your key after.

Create an account and send your first 5 messages on free models, with no setup. After that, add your own OpenRouter key in Settings. Creating a key is free, and free models work without adding credits.

Your key is checked with OpenRouter, encrypted on the server and never shown again. With your own key you can also use paid models and create agents.

Build notes

Measured, not guessed.

Each turn is traced in Langfuse with the exact context sent to each model. Answers can be scored by an LLM judge, and the agents' AI steps are covered by a 55-case evaluation suite with release gates. The app is Node.js with no npm dependencies and SQLite, hosted on Zoho Catalyst behind Cloudflare. Assistants ground answers in your own documents, with citations. Each one is scored on 15 rules (finding the right passage, correctness, numbers matching the documents, refusing attacks) and cannot be published until it passes. Next: reading links you paste, and web search with citations.