A developer in São Paulo opens a code editor that looks exactly like VS Code, types a sentence in Portuguese, and watches an AI agent scaffold an entire web app, install dependencies, and deploy it. The editor is free. The premium models behind it — Claude, GPT-4o, Gemini — cost the user nothing. That is the bet ByteDance is making with Trae.
From a plugin to a full IDE
Trae did not start as Trae. ByteDance first shipped MarsCode in 2023 as a plugin for mainstream IDEs like VS Code and IntelliJ, offering autocomplete and bug explanation. In January 2025 the company rebranded the effort and launched Trae globally as a full AI-native IDE — "The Real AI Engineer" — built by forking VS Code's open-source codebase. A China-version followed on March 3, 2025, powered by ByteDance's own Doubao (豆包) 1.5 Pro model with DeepSeek R1 and V3 available as switches.
The product ships in three forms: a Trae plugin, a standalone Trae IDE, and Trae SOLO, an agent mode tested from July 2025 that can take a plain-language description of a project and autonomously pick a tech stack, write code, configure the environment, test, and deploy. "Build me a morning-news website" becomes a shippable site without the user touching a terminal.
The growth story
ByteDance's own 2025 year-in-review puts the scale plainly: by the end of 2025, Trae had more than 6 million registered users across nearly 200 countries, with active users spread across China, the United States, Brazil, India, and Japan. The tool generated close to 100 billion lines of code worldwide, handled nearly 60 million sessions and roughly 500 million queries over the year, and pushed more than 100 feature updates. Its open-source trae-agent repository collected about 10.2k GitHub stars with 191 community pull requests merged.
The free pricing is the obvious disruptor. Cursor charges around US$20 a month for its pro plan and GitHub Copilot around US$10 a month. Trae offered free access to frontier models during its growth phase, a classic ByteDance land-grab: subsidize compute, capture the user base, monetize later. The company also mandated internally that staff stop using third-party AI coding tools and switch to Trae, reportedly because employee purchases of outside tools were leaking data to personal accounts. More than 80% of ByteDance's engineers were using Trae internally by mid-2025 — a useful real-world test lab for the product.
Why it matters
AI coding moved in 2025 from "smart autocomplete" to "agents that can ship features." Trae's SOLO mode is the aggressive end of that shift: the AI is no longer a side panel but a collaborator that owns multi-step work. The risk for incumbents is not just price but habit. If a generation of students and indie developers learns to build on a free ByteDance tool, the default workflow — and the data about how people build — sits with a Chinese company, raising the same enterprise-adoption and data-sovereignty questions that follow every consumer-AI export from China.
There is also an open-source angle. By releasing trae-agent and contributing research (over 10 papers at NeurIPS, ACL, ICSE, FSE, and ASE in 2025, the company says), ByteDance is courting the developer community that ultimately decides which tooling becomes standard. Trae supports up to roughly 11,000 Model Context Protocol (MCP) integrations, framing itself as the hub for complex, tool-connected workflows rather than just a text editor.
What readers can do now
- If you code: download Trae and run it against a real project for a week. Compare agent-mode quality with Cursor or Copilot on your own stack before assuming the free price means lower capability.
- If you run a team: pilot Trae on non-sensitive repos, but set a clear data-governance rule. A free tool that indexes your codebase is only "free" if the IP exposure is acceptable to you.
- If you follow the market: watch for the moment ByteDance introduces paid tiers or usage caps. The 6-million-user figure was built on subsidies; the durable number is what survives a price.
Honest limitations
User, session, and code-generation figures are ByteDance's own disclosures from Trae's 2025 year-in-review and related product posts; they were not independently audited. The "free forever" assumption is the author's description of a growth-phase strategy, not a company commitment — paid tiers may appear. Competitive pricing (Cursor ~US$20/mo, Copilot ~US$10/mo) reflects widely reported public plan prices and may change. The internal-adoption and mandate claims come from Chinese industry media reporting on a ByteDance internal memo and could not be verified against a primary company filing. Market-share and "default workflow" interpretations are the author's analysis.