Most research tools sell tiers where the interesting features sit behind the expensive plan. That means a PhD student who needs one full-text extraction a month pays the same as a lab running hundreds.
SciExpert bills tokens. Tokens are the unit of work an AI service actually consumes, so a short search synthesis costs a fraction of a long peer review report, and your bill tracks what you did.
The Free plan carries a starter allowance and keeps the core eleven services open; the heavier pipelines — Research Agent, Extract Data, Systematic Review, Figure Integrity and AI Peer Review — begin on the Researcher plan, because a single run of those can consume more than a month of free tokens.
Every run records the tokens spent, the model cost and the amount billed, and the numbers show up in your workspace so nothing is hidden.