Structured studio context
The agent sees your file tree, database, and preview—richer than a blank Codex thread.
Build apps with Codex
Build apps with Codex-style AI—without wiring your own stack
Codex and GPT excel at code—99xDev gives them a product-shaped home.
Skip repo setup; start from a prompt in a full-stack template.
Card required — $0 for 7 days.
Why teams choose 99xDev
Full-stack output, built-in data tools, and code you can export when the project outgrows the studio.
Agent-ready project
Every project starts as React + Express + SQLite—the shape coding models handle best.
No OpenAI project setup
Agent usage is included on your plan—no API keys or Codex CLI configuration to start.
Preview while the agent works
See UI changes immediately—better feedback loop than paste-only chat UIs.
Take code to your toolchain
Export and continue in Codex, Cursor, or CI when you want local automation.
Inside the studio
Integration prompts
Pre-built prompts for common Codex asks: Stripe, auth, webhooks, and more.
Common questions
- Does 99xDev use OpenAI Codex?
- 99xDev runs its own project agent in the studio. If you searched “build apps with Codex,” you get the same outcome—AI-built full-stack apps—without managing models yourself.
Start your 7-day trial
Create your account and start building. Card required — $0 for 7 days.