Is JSX Tool profitable or generating revenue in 2026?

No revenue figures, customer counts, or enterprise logos have been disclosed for JSX Tool as of mid 2026. The company is a 2 to 10 person, pre revenue YC Fall 2025 startup with no confirmed funding round beyond an early roughly 500K dollar check.

Who is JSX Tool's biggest competitor?

Stagewise, an open source AGPL licensed browser toolbar with over 6,500 GitHub stars as of July 2026, is JSX Tool's closest rival. It offers the same click element to AI agent workflow for free and claims usage inside Adobe, Amazon, and Microsoft.

Could AI or Cursor replace JSX Tool?

Yes, the risk is real. JSX Tool's core loop, click a React element, get DOM context, prompt an LLM, is the same feature Stagewise and 21st.dev already ship free and open source, and frontier IDEs like Cursor or VS Code could absorb it natively at any time.

Who owns JSX Tool and is it backed by Y Combinator?

JSX Tool is privately held and venture backed, founded by Jamie Sunderland and Dan Hyman, and went through Y Combinator's Fall 2025 batch with YC Partner Pete Koomen as its group partner, per YC's company page.

Has React 19 caused problems for JSX Tool's product?

Yes. As described in the Launch HN post dated around November 2025, React 19's memory optimizations strip source map metadata JSX Tool depends on for large pages, forcing the company to build a proxy setup workaround.

What does JSX Tool actually do?

JSX Tool is a Chrome extension paired with an open source local Dev Server that lets React developers click on a rendered element in the browser and edit its JSX or CSS source code live, with an AI prompt box for LLM assisted changes, as documented on GitHub as of November 23, 2025.

YC Fall 2025 · United States

JSX Tool

jsxtool.com ↗

Browser extension for clicking React elements and editing source code live.

Little protection left

Assessed 27 July 2026 · Evidence as of 27 July 2026

Not much stands between this business and its pressures.

On the recordSince 27 July 2026 · Checkable from 2026 · Every call on the record Checkpoint: Completion of promised IDE features (vim bindings, LSP, linting, file explorer) still listed as in app review

The call

A small YC team built a real feature that a bigger, free, open-source rival already ships, with no fence yet visible around it.

JSX Tool lets developers click on a React element in their browser and edit the code behind it live, with an AI assistant built in. The problem is that Stagewise already does this for free and open-source (and is used inside big companies like Adobe and Amazon), and tools like Cursor and Copilot are adding these same features natively, so JSX Tool has no special advantage that competitors cannot copy. The one thing that could save it is if the founders stop trying to be a full code editor and instead focus tightly on one type of user, like product managers tweaking text and layouts on live websites, or teams that need to check if a design system is being used correctly.

Why

AI pressure: Cursor, Windsurf, GitHub Copilot. These coding agents can add click-to-context-to-prompt editing natively, absorbing the one trick JSX Tool sells. Could AI do the core job? Yes, likely.

Bigger players: Stagewise (open-source, AGPL, 6.5k GitHub stars, claimed use at Adobe, Amazon, Microsoft). A free, more-starred open-source rival already does the same click-edit-source workflow and is better distributed. Could a giant copy it? Yes, easily.

What protects it. Founder execution speed and a second-time YC founder's ability to ship features fast, nothing else visible yet.

What would change this call

Stagewise gets acquired by Cursor, GitHub, or Vercel within 12 months. Would remove the free alternative and ease pressure on JSX Tool.
JSX Tool announces paying customers, revenue, or a named vertical focus within 12 months. Would show a move from generic feature parity toward a defensible niche.
Cursor, Windsurf, or Copilot ships a native click-to-edit DOM-context prompt feature. Would show the core workflow is absorbed by larger IDEs, squeezing JSX Tool further.

Key numbers

Stagewise has 6.5k GitHub stars vs JSX Tool's early-stage repo (2025-11-23)
Team size 2 to 10 employees (n.d.)
Free tier capped at 10 AI prompts per day (2025-11-23)

Named risks

Free open source competitor Stagewise already has 6,500+ stars and claimed enterprise usage, undercutting JSX Tool's pricing and distribution. Severity: high
Core AI feature (click element, get context, prompt LLM) is commoditized and replicable by frontier IDEs like Cursor or VS Code. Severity: high
Platform dependency: React 19 already broke JSX Tool's source-map based navigation once, showing the underlying framework can disrupt the product at will. Severity: medium
No disclosed revenue, customers, or funding beyond an early roughly 500K dollar check as of mid 2026, raising runway concerns for a 2-10 person team. Severity: medium
IDE feature set (LSP, linting, file explorer) still incomplete and in app review as of Feb 2026 launch, risking further delay against faster-moving rivals. Severity: medium

Rivals, as read in July 2026

Rival	Direction	Evidence
Stagewise	losing to	Free, open source AGPL rival with 6,500+ GitHub stars and active releases as of Jul 2026, vs JSX Tool's 2-10 person team
21st.dev	losing to	Fork of Stagewise shipping a competing browser toolbar to AI agent extension as of Feb 2026
Vercel v0	contesting	Dominant prompt-to-component incumbent in the same broad AI coding category as of Feb 2026
Cursor / Windsurf / GitHub Copilot	contesting	Frontier IDEs could natively absorb JSX Tool's click-to-context-to-LLM workflow at any time
Onlook	contesting	Open source desktop app offering real-time visual React code write-back as of Jul 2026

Questions people ask

Is JSX Tool profitable or generating revenue in 2026?: No revenue figures, customer counts, or enterprise logos have been disclosed for JSX Tool as of mid 2026. The company is a 2 to 10 person, pre revenue YC Fall 2025 startup with no confirmed funding round beyond an early roughly 500K dollar check.
Who is JSX Tool's biggest competitor?: Stagewise, an open source AGPL licensed browser toolbar with over 6,500 GitHub stars as of July 2026, is JSX Tool's closest rival. It offers the same click element to AI agent workflow for free and claims usage inside Adobe, Amazon, and Microsoft.
Could AI or Cursor replace JSX Tool?: Yes, the risk is real. JSX Tool's core loop, click a React element, get DOM context, prompt an LLM, is the same feature Stagewise and 21st.dev already ship free and open source, and frontier IDEs like Cursor or VS Code could absorb it natively at any time.
Who owns JSX Tool and is it backed by Y Combinator?: JSX Tool is privately held and venture backed, founded by Jamie Sunderland and Dan Hyman, and went through Y Combinator's Fall 2025 batch with YC Partner Pete Koomen as its group partner, per YC's company page.
Has React 19 caused problems for JSX Tool's product?: Yes. As described in the Launch HN post dated around November 2025, React 19's memory optimizations strip source map metadata JSX Tool depends on for large pages, forcing the company to build a proxy setup workaround.
What does JSX Tool actually do?: JSX Tool is a Chrome extension paired with an open source local Dev Server that lets React developers click on a rendered element in the browser and edit its JSX or CSS source code live, with an AI prompt box for LLM assisted changes, as documented on GitHub as of November 23, 2025.

Timeline

2026-07-23StartupHub.ai review finds no disclosed revenue or customer counts for JSX Tool
2026-07-20Stagewise vendor page claims usage inside Adobe, Amazon, and Microsoft teams
2026-07-16Stagewise GitHub shows active v1.22.0 release and commits, 6,500+ stars
2026-02-08JSX Tool launch coverage notes IDE features (LSP, linting, file explorer) still in app review
2025-11-23GitHub jsx-tool/jsx-tool repo describes Dev Server, open sourced WebSocket bridge component
2025-11-09Launch YC page profiles founder Jamie Sunderland, a second time YC founder
2025-11-01Launch HN thread for JSX Tool (YC F25) details free tier and React 19 source map issue

Revision history

27 July 2026

First assessed. Little protection left. The text above is fixed as of this date and is not edited afterwards.

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