# BillGuard > AI-assisted electricity, water and gas bill reviews, with evidence exports and dispute preparation for eligible paid users. These public documents describe product functionality, evidence limitations, website pricing and privacy. Verify findings against original bills and consult live pages for current offers and policies. Possible overcharges and estimated savings are not confirmed refunds. Comparisons require suitable historical bills. ## Product guides - [Product overview](https://billguardapp.com/agents/index.md): functionality, public site sections and iPhone app. - [Usage and limitations](https://billguardapp.com/agents/usage.md): account workflow, supported files and evidence boundaries. - [Pricing](https://billguardapp.com/agents/pricing.md): free allowance, one-time credits and optional Pro. - [Privacy and support](https://billguardapp.com/agents/privacy.md): data processing, policies and contact. ## Optional - [Full public guide](https://billguardapp.com/llms-full.txt): all four guides in one document.