Frame0

Frame0 is a desktop app for sketch-style wireframes, interactive prototypes and several diagram types. It suits designers who want to work in files across Linux, macOS or Windows; its no-time-limit free plan makes it possible to start without a subscription.

Overview

Frame0 focuses on low-fidelity work: its component library spans desktop, mobile, smartwatch and web interfaces, and components have adjustable states. That breadth is useful when sketching across device types, while the sketch-style approach is less suited to teams seeking a polished, high-fidelity design environment.

Documents are stored as individual files, which can be synced through services such as iCloud, Dropbox, Google Drive or Microsoft OneDrive. This keeps the work in a familiar file-based workflow, but it is not the same as a built-in shared workspace. Frame0 supports prototype sharing through exported files rather than relying only on a live presentation: prototypes can be exported as a single HTML or PDF file. PDFs may omit characters that the selected font does not support.

Key features

Shapes can link to other pages, external URLs or navigation actions, and presentation mode lets users demonstrate the resulting prototype. This provides a practical path from a rough screen flow to a shareable demo without requiring a separate prototyping app.

The library includes more than 1,500 sketch-style icons based on Lucide. Diagramming covers flowcharts, entity-relationship diagrams, UML use case diagrams and UML class diagrams, extending Frame0 beyond interface mockups for teams that also map processes or software structures.

An experimental AI Agent can connect to OpenAI, Anthropic, Google Gemini or xAI Grok using the user's API keys; usage is billed by those providers separately. Frame0 also offers an MCP server for compatible desktop AI services, including Claude Desktop and Cursor. These integrations are options for users already working with those services, not a reason to assume AI usage is included in the app price.

Pricing

The Free plan costs nothing, has no time or size limit, and includes all non-premium features, built-in shapes and 1,500 icons. It is a substantial way to evaluate the file-based workflow, though premium features are excluded.

Paid plans are priced monthly, with VAT excluded, and are organized around device allowances: Solo costs $99 a month for 1 device, Duo costs $159 a month for 2 devices, and Team costs $79 a month for 3 or more devices. Solo and Duo fit individual use across the stated device counts; Team is the lower per-plan price for three or more devices, but the pricing is not presented as a per-seat charge. The published plan details do not establish a time-limited trial or a separate seat quota.

A purchased license is perpetual, but major-version upgrades may require an additional payment. Refunds are available within 14 days of purchase. That makes the paid license terms worth weighing against the monthly prices, particularly for buyers expecting ongoing access to major upgrades.

Platforms

Frame0 runs on Linux, macOS and Windows. The download requirements are macOS 15 or later, Windows 10 or later, and Ubuntu 22.04 or Fedora 40 or later on Linux, so older systems may not qualify even though their platform is supported generally.

Who it's for

Frame0 is a good fit for designers who want sketch-style wireframes, clickable flows and lightweight diagrams in one desktop app, especially when a no-time-limit free plan is enough to get started. Its file-based storage also suits people who prefer syncing documents through their own cloud-storage service. Teams that need a built-in shared workspace, or buyers who require certainty about major-version upgrade costs, should compare alternatives before committing.

Pros and cons

• Pro: The free plan has no time or size limit and includes all built-in shapes and icons, so users can explore the core workflow without hitting a stated project cap.
• Pro: Clickable navigation, presentation mode and HTML or PDF exports cover several steps between wireframing and showing a prototype.
• Pro: Flowcharts and three types of UML or data-structure diagrams broaden its use beyond interface sketches.
• Con: Files are stored individually, so collaboration depends on syncing and sharing those files rather than a stated built-in team workspace.
• Con: AI-provider usage is billed separately, and PDF exports may lose characters unsupported by the chosen font.
• Con: Paid plans are monthly and major-version upgrades may cost extra despite the perpetual license.

Alternatives

For a broader comparison, browse Wireframing Software, Prototyping Software or UI design tools.

Choose Fluid UI if you want to compare a freemium option with a free trial and support across mobile, web and desktop platforms. Mockplus is worth considering when its free Basic plan's 10 users and 10 active projects matter more than Frame0's file-based approach. Justinmind offers a free plan with one project, unlimited screens and viewers, and UI design and wireframing; it is a relevant alternative when those project terms fit your work.

Quickmock is another option if you prefer a free, open-source project. MockFlow may suit users who want a free Basic plan with one editor, five reviewers and public sharing. Pencil Project is a completely free desktop app for Linux, macOS and Windows. For a web-based option, Banani has a free plan with monthly and daily credits, while Draftium allows up to three prototypes on its free plan.

Verdict

Choose Frame0 if you want a desktop-first tool for sketch-style wireframes, clickable prototypes and useful diagram types, with a genuinely open-ended free plan. Its strongest case is the combination of device-spanning components, prototype exports and diagramming; look elsewhere if your priority is a built-in collaborative workspace or predictable major-version upgrade costs.