The Google Sheets app is the latest attempt of Google to bring spreadsheet editing on mobile. It doesn’t yet match the capabilities of the online Google Sheets of course, but for a mobile app this is quite serviceable and should meet your requirements if you just need to do a bit of editing.
The app lets you create new spreadsheets or edit those that you’ve made with just a few taps. Once you’re done editing you can share it with colleagues or work on them together, a handy feature when you’re dealing with complex numbers. The app also has support for Excel files so you can open, edit and save them from your mobile.
As far as functionality goes, you can format the cells, enter formulas and sort data, and the best thing is your work is automatically saved so there’s no need to worry about losing data. If you’re working with sensitive data, there’s an option to use a 4 digit passcode to keep it safe from prying eyes.
When you launch Google Sheets you’re going to see a list of your spreadsheets, making it easy to find what you’re looking for. Adding borders and color text only requires a few taps, and while entering formulas might take a bit of getting used to, it’s not really that hard when you get the hang of it.
Google Sheets isn’t a full featured spreadsheet program and it doesn’t claim to be, but if you just need one for occasional editing on your app this will do.