A portable device for remote chemical assay classification, comprising a computer processor, and an apparatus implemented on the computer processor, the apparatus comprising: an out-of-sample data receiver, configured to receive data defining an out-of-sample extension extracted on a remote computer from classifying test assays of a chemical reaction on the remote computer into at least two groups, and an assay classifier, in communication with the out-of-sample data receiver, configured to classify a new assay of the chemical reaction into one of the groups, using the data defining the out-of-sample extension.