Principle
Create interactive UI prototypes with timeline-based animations
- Also known as
- principle
Available worldwide · Popular in: US
What is Principle?
A native macOS application for designing animated and interactive user interfaces across web, mobile, and desktop platforms, featuring keyframe-based animation controls and automatic transitions between artboards.
Principle pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
$129 per computer. Renewal available for $99 to access new features released after initial purchase.
Principle License
Single license per computer with one year of new feature access
- Timeline animation with keyframes and easing customization
- Multi-artboard screen flow design
- Automatic animations between named layers on different artboards
- Hover and mouse wheel event support
- Import from Figma and Sketch with intelligent merging
- Web-based sharing and preview
- Video export functionality
- One year of new feature access included
Add-ons
- License Renewal$99 one-time
What Principle does
The capabilities that matter for mockup tools, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Architecture model
- Local mac native app
- Css flexbox based auto layout engine
- -
- Stateful interactive prototyping with variables and logic
- ✓
- Component variants and property overrides
- -
- Design token variable mapping colors spacing typography
- -
- Real time multiplayer crdt cursor sync
- -
- Developer mode handoff environment css swift export
- -
- Advanced micro interaction animation smart animate
- ✓
- Third party plugin ecosystem API
- -
- Offline editing mode with conflict resolution
- -
- SOC2 type ii
- -
- Gpl or permissive oss license
- -
- Pricing model
- Flat lifetime license
Platform & deployment
Independently observed- macOS
Integrations (2)
Independently observed- Figma←•
- Sketch←•
Principle alternatives
Other mockup tools we track, ranked by the same independent score.
Compare Principle
Side by side against other mockup tools, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Principle, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Pricing transparency | 75 | 0.08 | 6.3 | ✓ |
| Capabilities | 46 | 0.05 | 2.2 | ✓ |
| Price level | 25 | 0.05 | 1.3 | ✓ |
| Integrations | 14 | 0.04 | 0.6 | ✓ |
| Reliability | 0 | 0.07 | 0.0 | - |
| Security posture | 0 | 0.07 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Pricing model: flat_lifetime_license · Architecture model: local_mac_native_app · Advanced micro interaction animation smart animate: Yes · Stateful interactive prototyping with variables and logic: Yes | mediumsource · 2026-09-01 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 2 | mediumsource · 2026-09-01 · 60% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | mediumsource · 2026-09-01 · 50% |