Pencil Project is not available as a web app but there are plenty of alternatives that runs in the browser with similar functionality. The best Online alternative is diagrams.net, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Pencil Project and many of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to Pencil Project are Figma (Freemium), Penpot (Free, Open Source), Balsamiq Wireframes (Paid) and Moqups (Freemium).
diagrams.net (previously draw.io) is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams. No login or registration are required and features include the ability to save locally (including SVG), a range of stencils, .
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Most users think diagrams.net is a great alternative to Pencil Project.
Penpot is the first Open Source design and prototyping platform meant for cross-domain teams. Non dependent on operating systems, Penpot is web based and works with open web standards (SVG). For all and empowered by the community.
"If they could see what Im thinking, they'd get it!" People just understand faster with pictures. It helps them see how information is connected, whether it is complete, and how a shift in one element impacts something else.
Mockup Designer, built with Backbone, Backbone-LocalStorage and Html2Canvas, is a super-easy-to-use mockup tool that uses the local storage of your browser as its backend. However the data layer is loosely coupled, so you can integrate with any RESTful API or any Backend service.
Online tool for creating mockups in the browser. Use your browser’s save function to save the file (just html for view only, complete save for an editable version) or export to codepen for others to view.