ToolStack
Prototypingdesign_ux

Principle Review

by Principle · San Francisco, California, USA · Founded 2015

G2 Score
4.2
Reviews
100
Starting Price
N/A
Free Tier
No
Learning Curve
Moderate
Quick Answer

Principle is a prototyping tool rated 4.2/5 on G2 from 100 reviews. It's best for ui_designer and ux_designer teams using design_thinking or lean_ux. Pricing starts at N/A.

Pros & Cons

Pros
Exceptionally intuitive timeline-based animation editor makes creating complex micro-interactions and transitions fast and visual
One-time purchase model ($129) is far more economical than subscription-based prototyping tools over time
Principle Mirror iOS app allows real-time previewing of prototypes on actual devices for realistic testing
Native import from Sketch and Figma enables seamless workflow — paste layers directly and begin animating immediately
Lightweight and performant native Mac app with minimal system overhead compared to browser-based alternatives
Driver-based interactions allow scroll-driven, drag-driven, and gesture-driven animations that closely replicate native mobile experiences
Cons
Mac-only — completely unavailable to Windows or Linux users, limiting cross-platform team adoption
No collaboration or multiplayer features — prototypes are local files with no cloud sharing, versioning, or team workspace
Limited ecosystem with very few integrations — no connection to project management, developer handoff, or communication tools
No web-based sharing — prototypes must be exported as video/GIF or viewed through the Mirror app, making stakeholder review cumbersome
Development has slowed significantly — infrequent updates and sparse communication from the solo developer raise long-term viability concerns
Not suited for complex multi-screen prototyping with conditional logic — better tools exist for full user flow prototypes (e.g., Figma, ProtoPie)

Pricing

Standard
$
per user / month
Premium
$
per user / month

* One-time purchase of $129 per seat. No subscription required. Free 14-day trial available. Mac-only application.

View current pricing on Principle Last verified: 2026-03-30

Key Features

Roadmapping
Sprint Planning
Backlog Management
Kanban Boards
Gantt Charts
Okr Tracking
User Feedback Management
Customer Portal
Idea Management
Analytics Dashboard
Custom Workflows
Custom Fields
Automations
Time Tracking
Resource Management
Portfolio Management
Api Access
Webhooks
Mobile App
Offline Mode
Ai Features
Templates Library
Guest Access
Sso Saml
Soc2 Compliant
Gdpr Compliant
Hipaa Compliant
On Premise Option
Interactive Prototyping
Animation Timeline
Auto Animate Transitions
Sketch Import
Figma Import
Drivers And Events
Scroll Groups
Component Reuse
Video Export
Gif Export
Mirror App

Integrations

Principle supports 3+ integrations.

figmasketch

Who Is Principle Best For?

Team sizes
freelancerstartupscaleup
Roles
ui designerux designerinteraction designerproduct designermotion designer
Methodologies
design thinkinglean uxagile
Industries
saasmobile appsconsumer techagencies

Frequently Asked Questions

No. Principle does not offer a free tier. It has a 14-day free trial.
Principle starts at N/A for its standard plan. One-time purchase of $129 per seat. No subscription required. Free 14-day trial available. Mac-only application.
Principle is best suited for ui_designer, ux_designer, interaction_designer, product_designer, motion_designer in freelancer, startup, scaleup teams using design_thinking, lean_ux, agile methodologies.
Principle does not have a listed native Slack integration. Check their marketplace for third-party options.
Disclaimer: This review is based on publicly available data from G2, official documentation, and third-party sources. Pricing verified on 2026-03-30. Some links may be affiliate links — see our disclosure. Last updated: 2026-03-30.