porta-pages

Small apps that are each a single, self-contained HTML file. Use them here, or save one and open it from disk, offline.

• Girih A tile-laying puzzle built on the five girih tiles of Persian strapwork.
• Web features for a self-contained HTML file Which web platform features can be relied on in a single HTML file opened from disk. Needs a network connection on the first visit.
• Should I open the windows? Compares indoor and outdoor air by heat and moisture, and estimates what letting it in would cost or save with your air conditioner or dehumidifier.