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Pencil Project vs Proto.io
People
Price
Free
Published entry price
$29per month
Prototyping Tools
Annual estimate10 people, entry price
Free
$348
Flat rate
Offer
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Prototyping Tools
Overview
Focus
Prototyping Tools
Prototyping Tools
Product
Free and open-source GUI prototyping tool with built-in shapes for desktop and web mockups.
High-fidelity mobile and web prototyping tool with animations, device preview, and user testing integrations.
Headquarters
Hanoi, Vietnam
Athens, Greece
Company size
2-10 employees
11-50 employees
Founded
2012
2011
Pricing details
Plan
Published entry price
Published rate
Free
$29 / month
Billable seats
Flat rate
Free options
Free plan
Free plan, Free trial
Pricing source
Source updated
Oct 29, 2026
Oct 29, 2026