Introducing BuildStax: the AI coding agent
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Read the launch notes
The AI coding agent
that runs your code.
BuildStax plans, edits, and verifies changes in your terminal — grounded in your whole repo.
How BuildStax works
Ground it in your repo.
BuildStax indexes your whole codebase, so the agent reasons about real symbols, types, and call sites — not stale snippets or guesswork.
Run, edit, and verify.
BuildStax executes commands, edits files, and runs your tests, fixing failures before a change ever ships to a branch.
Ship from the terminal.
Open branches, push commits, and draft pull requests without leaving your shell — every step reviewable and reversible.
ONE LOOP, PROMPT TO PR
From a one-line prompt to a merged pull request.
Ground it in your repo.
BuildStax indexes the codebase and reads the relevant files, so every decision is grounded in real code — not a guessed API or a stale snippet.
Plan, then execute.
It breaks the task into steps and proposes a plan you can edit. Then it runs commands, edits files, and iterates against your tests in your actual environment.
Review every change.
Each diff is reviewable and reversible. Approve a step, refine it, or roll back with a single keystroke — nothing ships until you say so.
Ship the pull request.
Open a branch, push commits, and draft the PR with a summary diff. BuildStax verifies the change passes your checks before it leaves your machine.
Loved by developers
Here's what developers shipping with BuildStax are saying
"BuildStax is the first agent that actually runs my test suite before opening a PR. It caught a regression I would have shipped straight to main."
"I stopped writing boilerplate. I describe the change, BuildStax edits the files, runs the linter, and opens the PR. I just review the diff."
"Context is the whole game. BuildStax indexed our monorepo and the agent stopped hallucinating APIs that don't exist."
"It plans, executes, and verifies — then hands me a clean diff. Feels like pairing with someone who actually read the codebase first."
Your agent, in motion.
From a single command to a merged pull request, BuildStax runs the whole loop in your environment.
Repo context
Index the whole codebase. The agent reasons about real symbols, types, and call sites — not guesswork.
Tool use
Run shell commands, edit files, and call your APIs. Every action is logged and reversible.
Plans
Break a task into steps you can review and edit before anything runs.
Verify
Run your tests and linters. BuildStax fixes failures and only ships changes that pass.
Pull requests
Open branches, push commits, and draft PRs with a summary diff — without leaving the terminal.
Pricing
Pick the capacity that matches your workflow.
Start small. Scale usage when you need it.
Capacity multiples compare included agent usage to Hobby. Prepaid credit covers overflow.
Personal projects
Hobby
For tinkering with agentic coding on personal projects.
Billed annually at $96/yr
Save $24/yr
Core workflow:
- Terminal agent
- Repo context
- Tool use
- Plans
- Code review
Daily development
Professional
For developers shipping code daily with background automation.
Billed annually at $240/yr
Save $60/yr
Everything in Hobby, plus:
- Background agents
- Test verification
- Parallel tasks
Power users
Engineer
For builders who need custom tools, stronger models, and priority routing.
Billed annually at $480/yr
Save $120/yr
Everything in Professional, plus:
- Custom tools (MCP)
- Priority models
- Advanced routing
Teams and compliance
Power
For teams that need security controls, self-hosting, and guaranteed support.
Billed annually at $960/yr
Save $240/yr
Everything in Engineer, plus:
- SSO / SAML + audit logs
- Self-hosted and on-prem models
- Priority support + SLA
Other ways to use BuildStax
Free access and flexible overflow.
Try the product first, then add prepaid credit only when included capacity is not enough.
Free
No card requiredTry BuildStax with monthly usage limits. Bring your own API key, or use our free models.
Prepaid Top-Ups
Overflow creditUse prepaid credit for overflow after your included capacity, or for pay-per-token models. See per-token pricing ->
Frequently asked
Short answers to the billing questions that usually slow teams down.
Yes - upgrade or downgrade instantly. Changes are prorated automatically.
It never expires. Use prepaid credit for overflow after included capacity, or for pay-per-token models.
Not by default. An optional opt-in, disabled unless you enable it, shares anonymized snippets with AI labs to help improve their models. In exchange, you get $5 of bonus usage per week.
Purchase prepaid top-ups for pay-per-token overflow, or upgrade your plan. Both are instant.
Annual billing shows the discounted monthly-equivalent price and is billed once per year. Monthly billing charges month to month. No hidden fees, cancel anytime.
Have special requirements or need a custom deployment? Get in touch with our team.
Security for production code.
An agent that runs in your repo, backed by the security guarantees your organization already runs on.
SOC 2-ready controls
Audit-friendly controls, access logs, and security documentation for enterprise review. Formal reports are available during onboarding.
View our Trust CenterPII Guard
Intelligent server-side PII redaction keeps sensitive user data protected.
Enterprise Ready
SSO, audit logs, access controls, procurement support, and dedicated implementation help.
Self-Hosting
BETARun BuildStax in your own cloud when your deployment requires it.
Learn more about self-hosting
Stop pasting.
Start shipping.
Plan the work, run the code, verify the change — all from your terminal.