The best alternatives to Klippper are Airtable, Milanote, and Walling. If these 3 options don't work for you, we've listed a few more alternatives below.
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Airtable is a platform that makes it easy to build powerful, custom applications. These tools can streamline just about any process, workflow, or project—and best of all, you can build them without ever learning to write a single line of code.
Create, edit, share, and collaborate on your spreadsheets using the Zoho Sheet app for Android devices—smartphones and tablets—for free. Also, open files in your device without having to sign up or sign in and start working from where you left, from anywhere, any time.
Work on all your budgets, accounts, reports, task lists, and other data with your team, on the go using your mobile devices.
Use Meeting Notes during online meeting to take notes quickly and save it either as text files or into your Zoho Notebook account. Meeting Notes are compatible only with these online meeting software: Zoom, Cisco WebEx, Zoho Meeting, and Zoho Showtime.