# Free tools

Free tools for sleep studies and sleep disorder diagnostic clinics. You need no account.

- [Home vs. in-lab sleep study cost calculator](https://sleepstudies.fyi/tools/home-vs-lab-sleep-study-cost-calculator.md): Estimate out-of-pocket costs for a home sleep apnea test (CPT 95806) versus an in-lab polysomnogram (CPT 95810) under cash pay or your deductible and coinsurance.
- [AHI severity & Medicare 90-day CPAP compliance calculator](https://sleepstudies.fyi/tools/ahi-cpap-compliance-calculator.md): Calculate your Apnea-Hypopnea Index (AHI) severity tier and check whether your nightly CPAP usage meets the CMS/DOT 70% 4-hour 30-day compliance rule.