Guest access (no sign-in) and authenticated access differ in several ways:
| Feature | Guest | Authenticated | |————-|———-|———————| | Search materials | Yes | Yes | | View properties | Yes | Yes | | Download structures | Yes | Yes | | API rate limit | 100/hour | 1,000/hour | | Builder tools | No | Yes | | Jupyter export | No | Yes | | Saved searches | No | Yes | | Comparator saves | No | Yes | | Inverse design | Limited | Full |
Guest access is designed for quick lookups and casual browsing. If you plan to use MatCraft regularly or need programmatic access, creating a free account is recommended.