Invoice Template for Principle App Designers
Prototyping in Principle is deeply specialised work that most clients don't fully understand — they see animated screens, not the engineering behind each driver and event. My biggest challenge is scoping prototype complexity, since a 5-screen prototype can take as long as a 20-screen one if the interactions are sophisticated. The second issue is clients expecting unlimited animation revisions within a fixed quote.
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What to include on your invoice
Principle designers bill across prototyping and delivery phases. Interaction Prototype Design covers building animated prototype files in Principle from imported Sketch or Figma screens, linking all drivers and events to create realistic motion. Micro-Interaction Design refers to designing small, focused animations — button press states, loading indicators, toggle switches — with precise timing and easing curves. Video Export for Stakeholder Review covers exporting prototype screens as MP4 videos optimised for sharing via email or Slack with leadership teams who cannot run .prd files. Prototype Iteration captures reworking animation timing, curves, or adding new interaction states after client review. Handoff Documentation includes written descriptions of all animation specs — duration, easing type, delay — formatted for engineering implementation.
How to price your work
Principle designers price by prototype complexity. A single micro-interaction animation costs $150–$500. A full app prototype with 10+ screens and multiple interaction states runs $1,500–$5,000. Hourly rates ($60–$120/hr) are common because Principle work is often iterative and hard to scope upfront. Consulting to produce animation specifications for an engineering team without building the prototype is a distinct service priced at $80–$150/hr.
Getting paid faster
Principle clients are typically senior designers at product companies who need prototypes for executive presentations or usability studies. These are sophisticated clients who respond to professional invoicing — structured line items, clear delivery notes, and professional terms. They also often have internal approval processes. Send your invoice before the prototype presentation so it's in the system — waiting until after the meeting means waiting through another approval cycle.
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