Google Sheets!

Create, edit, and collaborate with others on spreadsheets from your iPod, iPhone, or iPad with the free Google Sheets app. With Google Sheets you can:* Create new spreadsheets or edit any that were created on the web or on another device * Share spreadsheets and work together with others in the same spreadsheet at the same time* Get stuff done anytime even without an internet connection* Format cells, enter/sort data, view charts, insert formulas, use find/replace, and more* Never worry about losing your work everything is automatically saved as you type * Protect your spreadsheets with a 4-digit passcode* Open, edit, and save Excel files