The best alternatives to Tectonic are Parabola, Glide, and Blockspring. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Tectonic?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Glide turns spreadsheets into beautiful, easy-to-use apps, without code. Pick a spreadsheet or start with a template, customize your app, then share it instantly with anyone. Start today for free!
Arcane Sheets is a full-featured private online spreadsheet. You can create documents or import from Google Sheets and Microsoft Excel. All save and secure on blockchain-based cloud storage. 10GB free storage for all the friends from Product Hunt 😸✌️
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.