Impler.io - Powerful CSV & Excel Import experience for SaaS 🚀 Save months building data import experience from scratch 💰
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
csvbox - Spreadsheet importer for your web app, SaaS or API
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
Layercode UseCSV - Add CSV import functionality to your app in minutes
Sheetsu - Turn Google Spreadsheet into API