Our great sponsors
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NPOI
a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Have you tried NPOI?
I'm pretty sure NPOI doesn't support .xlsb. At least it didn't the last time I updated my benchmarks: https://github.com/MarkPflug/Benchmarks/blob/main/docs/ExcelBenchmarks.md
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.