Looking for the best regional archive catalog for 19th-century Ohio records

I’ve hit a wall trying to locate a comprehensive, searchable catalog that covers county‑level probate, land, and church records in Ohio for the 1800s. My current workflow relies on scattered county clerk PDFs and occasional microfilm trips, which is both time‑consuming and incomplete.

What I need:

1. A single interface (or at least a well‑indexed list) that aggregates the major Ohio archives – state, county, and denominational – for the 19th century.
2. Reliable citation data so I can reference the original source in my family tree.
3. Reasonable access terms – preferably free or low‑cost for hobbyists.

If you’ve used a database, a digitization project, or even a niche local society’s portal that meets these criteria, point me to it and share any tips on navigating the interface. Specifics on coverage gaps or subscription models are also welcome.

Thanks in advance for any leads.