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BYOB New inbox in every project
AI Testing Agent
Shipping without checking feels fast until a broken checkout reaches customers. BYOB's testing agent drives a real browser through your app, reports what broke, and keeps a history so you can see what a change actually cost.
Runs on the stack you trust
Prompt to product
From one-line brief to finished app.
Compare the one-line brief with what BYOB ships. Real layout, data, and deploy status, editable from the same workspace.
TD
Team Tasks
Shared task tracking
Today4
Done11
Streak6d
Open live app ↗
Drag the handle. Or focus it and use the arrow keys.
Get inspired
Sites like this, live today.
Real sites that do it well. Build something like this with BYOB.
Fresh from the community
See what builders ship, or start from an example.
Live workspace
Code, chat, and preview in one place.
The workspace is built for repeated product work, not disposable demos. Every generated file stays inspectable, every change is visible, and every follow-up can target the exact part of the app you care about.
01 · EDITOR
Generated code, ready to edit.
Every file BYOB writes stays visible and editable. Follow-ups target the exact lines you care about instead of regenerating from scratch.
- Added lines highlighted the moment they land
Code
Act mode TodoPage.svelte
schema.ts
1
<script lang='ts'>2
type Task = { id: string; title: string; done: boolean
}3
let tasks = $state<Task[]>([])4
5
function toggleTask(id: string) {6
task.done = !task.done // just added by BYOB7
}8
</script> main · 0 problems Preview ready
02 · AI COMMAND
Plan, build, and refine in one chat.
Describe the outcome once. BYOB turns it into a build plan, implements it step by step, and keeps every change visible while you iterate.
- Build plan with live progress you can inspect
B BYOB AI
Chat Act
Your prompt
“Build a todo app for beginners”
Build plan
80%- Task list UI + empty state
- Add + toggle actions
- Progress summary…
Add due dates and filter by done…
03 · LIVE PREVIEW
See every change the second it lands.
The preview updates as BYOB works, with deploy status attached, so the path from edit to production stays inspectable.
- Real app state, not a static mockup
Live preview
/TD
Team Tasks
Shared task tracking
Progress 2 of 3 done
- Wireframe landing page
- Task list component
- Responsive polish + QA
Ask BYOB to refine
Deployed · SvelteKit · SSL on
Prompt to app
From first prompt to a workspace you can ship.
Start conversationally, approve the shape, let Tool Mode implement, then refine and deploy from the same workspace.
- 01 Describe the product Start with the outcome, audience, and any constraints. BYOB turns the idea into a practical build plan.
- 02 Shape the UX Review the proposed flows, screens, data needs, and visual direction before code starts moving.
- 03 Generate the app Tool Mode writes SvelteKit code, connects integrations, and keeps each change visible in preview.
- 04 Test and refine Ask for edits, roll back when needed, run checks, and keep the project editable instead of disposable.
- 05 Deploy Ship the finished app, connect domains, and keep iterating from the same workspace.
Agent and backend
Code with your agent, ship with a real backend.
Connect Codex, Claude Code, or Antigravity to your project, then store data and ship to production without leaving the workspace.
- Approve project access from BYOB
- Installs the byob command
- Preview, deploy, git diff, DNS, credits, and code tools
npmnpx -y byob-cli codex installApprove only the projects your agent can touch, then read context, edit files, inspect diffs, test previews, and roll back from your terminal.
- 1
- prompt to start
- 3
- live panes
- 24/7
- edge preview
Loved by builders
Rated 4.9/5 by developers and founders using BYOB to move from idea to shipped product.
Built for shipping
The parts that usually slow you down are already here.
BYOB handles product planning, implementation, preview, testing, database work, and deployment from one focused interface, with coding-agent access and production analytics when you want to keep working from your own terminal.
This part is hands-on. The cards drift until you touch them. Drag to rearrange, or press and hold one to feel it push back.
Agent integrations
Give Codex, Claude Code, or Antigravity scoped access through BYOB CLI or Agent MCP. Your agent reads context, edits code, tests previews, and deploys from your terminal.
Git history and diffs
Every change lands as a commit. Inspect history, compare diffs, and see exactly what changed since the last deploy.
Inbox in every project
Every project ships with an inbox. Collect messages, leads, and feedback from your app without wiring a third party.
Email sending built in
Send magic links, OTP codes, and transactional mail from your own sender address. Resend-backed, no SMTP setup.
Google and magic-link login
Offer Continue with Google plus passwordless email codes. Sessions and callbacks are handled.
Custom domains and SSL
Point your domain at BYOB with guided DNS checks. Certificates are automatic.
Visual editing
Click any element in the live preview and describe the change. Copy, spacing, color, behavior.
AI testing agent
Run full-site or feature checks and get implementation-level feedback you can apply in one step.
Version rollback
Step between saved states or redeploy a known commit when an experiment goes sideways.
One-click deploy
Builds publish to production hosting in one step. Deploys can auto-save the project state first.
Deployment analytics
Worker traffic, errors, CPU timing, subrequests, and custom-domain status from the workspace.
Supabase aware
Connect Supabase and BYOB reads schemas, drafts migrations, and generates types that match your app.
Team collaboration
Invite people in and keep sessions coordinated so work never overwrites work.
- Vision inputs
- Voice coding
- Project templates
- SEO-ready output
- Context tracking
- Model lock
Simple pricing
Start with credits, upgrade when usage is steady.
Pay as you go when you are exploring. Move to Pro or Max when BYOB becomes part of your regular build workflow.
Pay as you go
$0
$1 = 100 credits
Pro
$25
2,000+ credits/mo
Max
$79
8,000+ credits/mo
Live estimator
What will your app cost?
Try the cost calculator. Drag the pages slider, toggle the options, and watch the agency quote vs BYOB update instantly.
Open full cost calculator →Number of pages: 5
Traditional agency estimate
$5,750 upfront
Yearly maintenance
~$1,150 / year
BYOB estimate
~$45 in credits
BYOB builds the same site from one prompt and hosts it on the edge. Planning estimates, not quotes.
See BYOB plansView full pricing
Need white-label and SSO? Talk to us →
BYOB's testing agent runs browser-based checks inside your project. Full-site mode sweeps every route for release confidence, while feature mode tests one critical flow like checkout or login in depth. Each run produces a report and history so you can compare regressions before you publish.
Two scopes, one control
A full physical checks everything and finds nothing in particular; a specialist appointment examines one joint and finds the tear. BYOB's testing agent offers both postures from the same place. Full-site mode sweeps the whole app for release confidence, while feature mode aims the whole budget at a single workflow. The choice takes seconds and depends on what changed: shared pieces like login helpers or layout components call for a sweep, while one changed flow calls for depth.
Writing a feature test that means something
Vague scope produces vague verdicts. Names like login or dashboard give the agent almost nothing to verify. A useful feature name reads like a short contract, naming the trigger, the expected path, and the fallback, for example magic-link login with expired token handling. The run template then records the success condition, edge condition, and whether to add a visual pass or optional unit checks. Precision in the name is what makes the report precise.
What a run actually checks
A run drives the browser through your live project rather than reading static files, so it exercises the same routes your users hit. It can follow navigation, submit forms, and check state changes, and a visual pass adds layout and rendering checks for UI-heavy screens. Optional unit checks cover logic and data transforms when those changed. The agent works from what you named, so if a flow was not described, it is not asserted, which is why scoping matters more than test count.
Reports, history, and regressions
Each run leaves a report you can read and a history you can compare against. That history is the real payoff: a green run today means little without a baseline, but the same feature failing after a small change narrows the cause to that change. Because runs are stored per feature, you can see whether a fix held, whether a regression reappeared, and which areas stay stable. Reviewing activity alongside reports turns testing from a gate into a feedback loop.
Where testing fits in the build loop
The productive rhythm is to test during development, not only at the end. Run feature mode while iterating so a broken login or checkout surfaces within about 30 seconds of the change, then run a full-site sweep once before release for broad confidence. After a hotfix, rerun the affected feature so history records the recovery. This keeps the expensive broad sweep rare and the fast targeted run frequent, which is usually where the fastest signal lives.
Honest limits
The testing agent is not a guarantee. It verifies the flows and conditions you describe, so an untested edge path can still fail in production. It also does not replace thoughtful unit tests for business logic; it complements them. Browser-based checks can be affected by timing or environment, so treat a single unexpected failure as a signal to investigate rather than absolute proof. The value comes from running the right scope repeatedly and reading history, not from a one-time green check.
FAQ
Frequently Asked Questions
What is the difference between full-site and feature mode?
Full-site mode sweeps the whole app before a release. Feature mode goes deep on one named workflow during development, giving faster signal on the flow you just changed.
How should I name a feature test?
Include the trigger, the expected path, and the fallback, such as magic-link login with expired token handling. Vague names produce vague reports.
Does it replace unit tests?
No. Enable the optional unit checks when logic or data transforms changed, and skip them for pure copy edits.
When should I rerun a feature test?
After every meaningful change to that feature and again before release, so history shows regressions against a known baseline.
Where do most regressions hide?
In retry and fallback paths rather than the happy path, so include edge conditions in every feature run.
Can it check visuals as well as behavior?
Yes. A visual pass flag adds layout and rendering checks for UI-heavy workflows on top of the behavioral assertions.
Build the first version today.
Start with one clear prompt. BYOB will help turn it into a product you can inspect, edit, test, and ship.