Overflow vs Proto.io

Overflow lets users create, present, share, and get feedback on interactive user flow diagrams. It syncs designs from Figma, Sketch, Adobe XD, and Adobe Photoshop. Diagrams can include customizable connectors, styles, device skins, hotspots, shapes, text, and multiple boards. Users can present playable flows, self-guided Stories, and rapid prototypes. Cloud publications can be shared by link, embedded, protected with a passphrase, exported as PDF or PNG, or printed. Collaboration includes personal and team folders, editor invitations, comments, mentions, and notifications, with integrations for Confluence, Jira, and Trello. Overflow is available on macOS, Windows, and the web. Its 14-day trial requires no credit card and gives desktop-app and Cloud-sharing access without limitations. After the trial, that access ends; data remains hosted for 60 days and is then deleted if no subscription is activated. Pro costs €19.95 per user/month, billed monthly, and includes 1GB cloud storage per user, Cloud sharing, folders, and comments.

Proto.io is a web-based, no-code tool for building interactive prototypes for iOS, Android, and web. It includes native iOS and Android apps, more than 250 UI components that mimic native behavior, and over 1,000 customizable templates. Its library lists more than 6,000 icons, stock images, and sound effects. Prototypes can use over 80 events and over 40 actions, including nested and multidirectional scrolling, as well as 18 built-in screen transitions. Users can share links and snapshots or export to PDF, PNG, and HTML. The free plan is limited to one user, one active project, five prototype screens, and 10 MB of storage; it allows single-click sharing but no additional reviewers. A 15-day trial is listed. Freelancer costs $29 a month, billed monthly; annual billing is listed at $24 per month. Other listed monthly plans are Startup at $49.00 USD, Agency at $99.00 USD, and Corporate at $199.00 USD. Enterprise pricing is tailored. Paid plans include 256-bit SSL encryption.