ProtoPie
Seoul, KR · Founded 2014 · 83 employees on LinkedIn · 10 known investors
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ProtoPie is a code-free interaction prototyping tool for design teams, offering collaboration features, developer handoff with automated interaction specs, and integrations with hardware, APIs, and multiple devices. Its Pro plan targets design professionals in companies and agencies, with capabilities spanning mobile, TV, gaming, and automotive prototyping.
Also known as Studio XID · Studio XID Korea
Founders & leadership
ProtoPie was founded in 2014 by Tony S. Kim.

Investors · 10
Also in the syndicate · 5
Funding
SEC filings, press & company announcements$21M disclosed across 1 of 3 rounds · 2022–2025
- $21MSeries BJan 2025 · 2 sources
Korea Development Bank (lead), Korea Development Bank (KDB) (lead), LB Investment (lead), Axis Investment, BSK Investment, CJ Investment, HB Investment, Industrial Bank of Korea, Shinyoung Securities
Source ↗ - Undisclosed amountSeries AMay 2022Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
Company profile
researched Aug 2026ProtoPie, operated by Studio XID, develops software for building high-fidelity interactive prototypes without writing code. The core desktop application, ProtoPie Studio, runs on macOS and Windows and lets designers import assets from Figma, Sketch or Adobe XD via plugins and then author interactions using triggers, responses, conditions, variables and formulas. A companion mobile app, ProtoPie Player, previews prototypes on iOS, iPadOS, Android and HarmonyOS, while ProtoPie Cloud handles sharing, feedback collection and handoff. Smartwatch testing on real devices is offered on the Enterprise plan.
ProtoPie Connect extends Studio beyond a single screen, linking prototypes to multiple displays and devices, custom hardware, APIs and live data, web embeds and camera feeds, and game engines including Unity and Unreal. It is packaged in Free, Core and Enterprise tiers and is positioned for automotive UX and HMI simulation (including driving simulators and signals from steering wheels, seats and lights), IoT appliance emulation, robotics and medical imaging, TV interfaces tested with real remote controls, and game experiences. The company also markets native device sensor and voice interaction support, an MCP integration, and AI-assisted generation of interactions with credit-free refinement and automated spec handoff to developers.
Supporting the product are ProtoPie School, an online course and certification site with content in English, Korean and Japanese plus industry tracks (digital dashboard, voice assistant, mobile game, TV and video), a user community branded ProtoPioneers, a blog and a public prototype gallery.
Founding story
The company was founded in 2014; Tony Kim serves as CEO.
Business model
B2B SaaS software licensing. ProtoPie Studio is free to start with no credit card required, and paid tiers scale up to Enterprise; ProtoPie Connect is sold separately in Free, Core and Enterprise tiers, with features such as real-smartwatch testing reserved for Enterprise. The company reports having been commercialized in 2019 and describes itself as a B2B SaaS business.
Subscription plans for individual professionals, teams and enterprises, with a free entry tier, per-product tiers for ProtoPie Connect, enterprise contracts handled through a sales team, and AI usage credits bundled into promotions. An affiliate program is also offered.
Traction
As of the January 2025 Series B announcement, ProtoPie reported adoption by more than 50,000 companies across over 180 countries, with reference customers including Microsoft, Google, Meta, BMW, Mercedes-Benz, Ford, Johnson & Johnson MedTech, Medtronic, Chime Financial, Revolut and Itaú Unibanco. Total disclosed funding stands at $21 million from the Series B round, and third-party data lists the company in the 51-200 employee band.
Latest developments
In January 2025 ProtoPie announced a $21 million Series B co-led by returning investor LB Investment and Korea Development Bank, with proceeds directed to global sales expansion, a user community platform, alliances with UI design and UX research software vendors, and AI-powered features. The current website markets the product as an AI-driven prototyping platform with AI-generated interactions and clean spec handoff, alongside a ProtoPie MCP integration. Recent company notices cover moving Individual plan users to Pro, a promotion bundling one free month of ProtoPie Pro with 1,000 AI credits, and scheduled maintenance on February 8, 2026.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
Positions itself as an advanced, high-fidelity prototyping tool competing with Figma, Framer, Adobe XD and Proto.io, with particular emphasis on hardware, multi-device and automotive HMI use cases. It ranked first in 2022 and second in 2023 in the annual UX Design Tools Survey's "Advanced Prototyping Tool" category and received a UX Design Award at the International Design Center in Berlin in 2024.
Emphasis on interaction fidelity without code — a trigger/response authoring model with logic, variables and formulas — combined with ProtoPie Connect's ability to drive multiple screens, physical hardware, sensors, APIs, camera feeds and game engines, which extends prototyping to automotive HMI, IoT, robotics/medtech and TV contexts that browser-based design tools typically do not cover. The company also markets AI assistance that follows explicit designer intent and generates developer handoff specs, and reports a short learning curve relative to capability.
Technology
Desktop authoring application for macOS and Windows with a trigger-and-response interaction model supporting conditions, variables and formulas rather than code. Mobile player apps cover iOS, iPadOS, Android and HarmonyOS. ProtoPie Connect adds bridging to external systems: REST/API calls and real data, web embeds via URL or iframe, live camera and streaming feeds, custom plugins and bridge apps, multi-screen and multi-device orchestration, Unity and Unreal embedding, and hardware signal exchange with items such as steering wheels, seats and lights. Additional capabilities include native device sensors, voice interactions, a ProtoPie MCP integration, and AI features that generate interactions and produce handoff specifications.
Go-to-market
Free self-service download and sign-up funnel combined with enterprise sales (demo requests and contact-sales paths for Connect, smartwatch testing and enterprise plans). Demand is supported by education and community assets — ProtoPie School courses and certification, the ProtoPioneers community, a blog, and a public gallery — plus plugin distribution inside Figma, Sketch and Adobe XD, an affiliate program, and design-industry awards and survey rankings. Series B proceeds are earmarked partly for expanding global sales presence and a community platform.
Product designers, UX/UI designers, motion designers and UX researchers in enterprises and agencies. Named customers span high-tech (Microsoft, Google, Meta, Netflix, Picsart), automotive OEMs and suppliers (BMW, Mercedes-Benz, Ford, MBition), media (Warner Bros. Discovery), medtech (Johnson & Johnson MedTech, Medtronic), fintech (Chime Financial, Revolut, Itaú Unibanco) and gaming studios.
Geography
Headquartered in South Korea (Studio XID Korea) with customers in more than 180 countries; localized learning content in English, Korean and Japanese, and stated plans to expand global sales presence following the Series B.
History
Founded in 2014 and commercialized in 2019, ProtoPie grew into a B2B SaaS company serving prototyping needs in automotive, IoT, mobile and web. It topped the 2022 UX Design Tools Survey's advanced prototyping category, placed second in 2023, won a UX Design Award in Berlin in 2024, and raised a $21 million Series B in January 2025 to fund global expansion, a community platform, ecosystem partnerships and AI features. Subsequent product and packaging changes include migrating Individual plan users to the Pro plan and introducing AI credits.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 6
launches, deals, and filingsProtoPie announced a $21 million Series B co-led by returning investor LB Investment and new backer Korea Development Bank, each committing $3 million, with participation from HB Investment, BSK Investment, Industrial Bank of Korea, Shinyoung Securities, Axis Investment and CJ Investment. Funds are allocated to global sales expansion, a community platform, ecosystem partnerships with UI design and UX research vendors, and AI-powered features.
$21M source ↗
Company notice describes migrating Individual plan users to the Pro plan, alongside a promotion offering one free month of ProtoPie Pro with 1,000 AI credits.
ProtoPie ranked first in the 2022 annual UX Design Tools Survey in the "Advanced Prototyping Tool" category and second in 2023.
ProtoPie, founded in 2014, was commercialized in 2019 and developed into a B2B SaaS business.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
▸Research sources · 8
primary sources listed
- ProtoPieprotopie.io · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does ProtoPie do?
- ProtoPie is a no-code, high-fidelity interaction prototyping platform for design teams across mobile, web, automotive, IoT and TV.
- Who founded ProtoPie?
- ProtoPie was founded by Tony S. Kim in 2014.
- Who are ProtoPie's investors?
- ProtoPie's investors include Atinum Investment Co. Ltd., LB Investment, Vela Partners, BSK Investment, Industrial Bank of Korea.
- How much funding has ProtoPie raised?
- ProtoPie has disclosed $21M raised across 1 of its 3 known rounds.
- Where is ProtoPie headquartered?
- ProtoPie is headquartered in Seoul, KR.

