The short version
OpenRouter is mostly infrastructure. It is an API that routes your requests to lots of models behind one key and one bill, and it is very good at that. But it expects you to bring your own software - the chat interface, the accounts, the sharing, all of it is yours to build or wire up.
Unium is the finished app. The chat interface, the model picker, accounts, shared chats, shared wallets - that is the product. You do not build anything.
So a rough test: if you are writing code that calls models, look hard at OpenRouter. If you just want to sit down and chat with the best model for the job, Unium is the thing you actually open.
Who it is for
OpenRouter is for developers putting AI into their own product. The unit of use is an API call.
Unium is for people who want to use AI directly - individuals, families, small teams. The unit of use is a conversation, and you are not expected to know what a token or an API key is.
Collaboration
This is where they barely overlap. Unium is built so other people can join in: share a chat and someone continues the real thread, share a wallet and a group pays from one balance. OpenRouter, being an API, leaves all of that to whatever app you put on top of it.
Pricing shape
Both avoid per-provider subscriptions, which is the shared appeal. OpenRouter meters usage against credit you load, aimed at API traffic. Unium is also pay as you go from a prepaid balance, but wrapped in an app a non-developer can use, with a clear pricing page and a 14-day money-back guarantee.
So they are not really competitors so much as different layers. Plenty of people could use both - OpenRouter inside something they are building, Unium for their own day-to-day chatting.

