Zipline dev here. Zipline happily works on minutely data (in fact, we recently dropped support for daily mode entirely on Quantopian, which is built on top of Zipline).
All the tutorials and examples for Zipline use daily data because there's no freely-available minutely data that we can distribute to our users.
All the tutorials and examples for Zipline use daily data because there's no freely-available minutely data that we can distribute to our users.