Top 30 Low‑Cost UI & UX Prototyping Tools for Startups

Curated list of the best affordable (or free) UI/UX prototyping and wire‑framing software ideal for early‑stage startups.

Featured Offers
Verified Options & Solutions
#2 Figma

Collaborative design tool with a generous free tier; real‑time co‑editing, components, and prototyping.

Vector‑based design and prototyping app; starter plan offers unlimited shared prototypes for $9.99/mo.

#4 Sketch

Mac‑only UI design tool; low‑cost individual license ($99/yr) with powerful plugins for prototyping.

Free plan includes unlimited boards, basic prototyping, and real‑time collaboration.

#6 Marvel

Web‑based design, prototype, and handoff platform; free tier supports 1 user and 1 project.

Low‑fidelity wireframing tool; $9/mo per editor with unlimited projects.

Advanced prototyping with interactions & conditional logic; $14/mo per user for the RP Pro plan.

#9 UXPin

Design system‑centric prototyping; starter plan at $14.99/mo per editor.

#10 Proto.io

High‑fidelity mobile & web prototyping; basic plan $24/mo per user.

#11 Framer

Interactive design tool with code‑based components; free tier includes 3 projects.

Wireframing and prototyping with interactive UI elements; free plan for 1 user.

#13 Moqups

All‑in‑one web app for wireframes, mockups, and prototypes; free plan limited to 1 project.

Minimalist web‑based wireframing; free version with basic shapes, paid at $14/mo.

#15 Penpot

Open‑source, web‑based design & prototyping platform; completely free.

#16 Mockplus

Rapid prototyping with drag‑and‑drop components; $9/mo per user for the Pro plan.

#17 Fluid UI

Web‑based UI prototyping with interactive elements; free tier supports 1 project.

Free, open‑source GUI prototyping tool for desktop; supports multiple platforms.

Diagramming and wireframing tool; free plan includes 3 editable documents.

#20 Whimsical

Sticky notes, flowcharts, and wireframes; free tier allows 4 boards.

#21 Overflow

User‑flow diagramming with clickable prototypes; free plan for 1 project.

#22 Uizard

AI‑powered design to prototype conversion; free tier includes 3 projects.

Vector design app with prototyping features; free version available, Pro at $49/yr.

#24 Vectr

Free, cross‑platform vector graphics editor; can be used for low‑fidelity mockups.

Free collaborative whiteboard for brainstorming and low‑fidelity wireframes.

#26 MockFlow

Wireframe and UI flow tool; free plan includes 1 project with limited symbols.

Free tier provides unlimited viewers and 1 active prototype, perfect for early testing.

#28 Zeplin

Design hand‑off and prototyping; free for up to 1 project and 1 active user.

Free starter plan includes 1 shared prototype and 1 design spec.

Free community resources and plug‑ins that extend Figma’s prototyping capabilities.

Free sharing of up to 3 public prototypes; ideal for small startup teams.

#32 Miro

Online whiteboard with UI mockup templates; free plan offers 3 editable boards.

Free community templates that speed up responsive UI prototyping.