Best Platforms for Building Apps with External User Access (March 2026 Update)

External user portals are web-based applications that provide a secure interface for sharing specific data and workflows with customers, partners, and vendors, ensuring that each user only accesses information relevant to them. Instead of traditional methods like emailing spreadsheets or granting broad access to internal tools, these portals offer controlled access through strict data isolation and permission controls. Several builders, such as Stacker, Airtable, Softr, Glide, Noloco, and V0, cater to different needs, with Stacker being highlighted for its no-code infrastructure, AI-assisted generation, and field-level permissions that support scalable, multi-audience portals without per-seat fees. In contrast, other builders like Airtable and Softr have limitations in scaling or require additional costs as user numbers increase. The choice of portal builder depends on factors such as data model flexibility, ease of use for non-technical teams, and pricing structure, with no-code solutions often preferred for reducing overhead and enhancing security without developer involvement.