Ship software with AI that you can trust.
PromptBranch turns your specs and architecture into a multi-model, deliberated, audited, version-controlled source of truth so the AI doing the work knows what you actually meant.
The Problem
You started with a clear idea. But after lots of iterations, you crack open the code and see thatwhat you thought you were building is not what you got.
Your intent might not have been as clear as you thought. Maybe your spec wasn't as unambiguous as it should've been. Maybe your prompts are having the agent build software the wrong way: like a human would.
Unless you meticulously pour over every line of AI-generated code you can't see it happening. By the time you notice something's wrong, you're already past the tipping point into nonsensical code.
LLMs are faster than humans. But, they lack the context to build software the way you want. They've been trained on billions of lines of code and documents to build software that plays to their weaknesses, processes designed for human brains, not LLMs. AI needs to build software the way they work best.
A Different Approach
Humans own the design, guidance, and oversight. AI owns the implementation. Every consequential decision is reviewable, auditable, and connected to the work that came before and after it. Forgot a contstraint? Add it to the charter and the downstream documents, automatic checks, and extant code will automatically check for it. Realized that the architecture is wrong? Change it in the spec and get a blast radius analysis of everything that needs to change.
PromptBranch is the workspace where that happens. You write a charter. Multiple AI models deliberate against it adversarially, surfacing weaknesses you missed. You resolve each finding and document your rationale. The result is an architecture document that is unambigous and suitable for task generation. And every commit or pull request is validated against all of this to ensure what you want is what you get.
AI coding is great. This process has been honed over the last two years of building software exclusively with and by AI. It works, and it works well. Now you too can ship software without worrying about it.
How It Works
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01
Draft the Project Charter
You write what you're building and why. PromptBranch's brain-trust - multiple AI models reasoning adversarially - pressure-tests it for unstated assumptions, missing alternatives, and internal contradictions. You resolve and commit the findings.
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02
Architect in Horizontal Phases
PromptBranch uses the charter to generate an architecture spec into chunks of value. The star chamber of AI models reviews each chunk against the charter, against the architectural whole, as well as looking for inconsistencies and contradictions. Conflicts surface as findings that you can evaluate and resolve.
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03
Generate Tasks
PromptBranch uses the upstream docs to generate tasks. Each task is reviewed against the architecture spec and against the project charter, as well as dedicated subject matter experts. Again, you're in the loop to evaluate and resolve the findings.
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04
Publish to Your Repo
When a chunk is ready, PromptBranch publishes the charter, architecture, and chunked TODOs to your repo as a pull request. Where you go from there is up to you - agents writing all of it, humans in the mix, whatever, safe in the knowledge that the todos are in aligment with how you want it built.
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05
Close the Loop
When implementation uncovers a problem, the issue is raised as a finding against the original document; the council of different AI models reviews the finding and reaches a consensus for you to evaluate. You decide whether to revise the architecture, waive the concern, or propose your own solution. Every decision tree is logged with author, timestamp, and rationale, and the new architecture is published to your repo via a pull request.
Who It's For
PromptBranch is for solo founders, technical leaders, domain experts, and anyone else who are shipping software with AI assistance and want a methodology that scales past the first feature.
It works best if you think through writing rather than through code, if you're comfortable owning architectural decisions, and if you want a record of what you decided and why, both for your own future reference and because accountability matters when the AI gets something wrong.
PromptBranch is probably not for you if you design by writing code itself, prefer to implement features by hand, or are looking for a code-generation tool. There are good tools for that. This isn't one of them.
What's Different
Not Vibe Coding
Vibe coding has rightfully gotten a bad reputation. PromptBranch optimizes for design surviving first contact with implementation. Move a bit slower at first to go dramatically faster when it's time to fan out and write code.
Not Traditional Spec-Driven Development
While scattered markdown docs in your repo and installed skills might feel like a reasonable way to go, you'll quickly realize a giant pile of markdown isn't a good way to build software. PromptBranch was built for human-led design with AI implementation, with the review process necessary for cost-effective, trustworthy AI development.
Not "just use Claude Code"
Coding agents are excellent at speed and bad at remembering that little detail tucked away in some spec or in some markdown fragment somewhere. PromptBranch is where the deciding & remembering happens, with the audit trail & review machinery that makes it trustworthy.
Apply for the beta
We're letting in a small number of users who are excited about a new way of building software and want to help shape it. If that's you, tell us a little about what you're working on.