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Your architectural partner,
from day one.

Requirements are vague. Architecture is rushed. Decisions aren't documented. The result: rework, scope creep, missed edge cases, and blown budgets.

Tullius fixes that.

It guides you from initial requirement analysis to a robust, high-performance system design, asking the right questions before you start building.

Get startedHow it works

How it works

Three guided conversations. Three documents. One clear plan.

A three-stage process that turns your idea into a production-ready plan. Each stage builds on the last.

01

Specification

Tullius guides you through your requirements, user stories, and acceptance criteria. The full discovery process, ready in hours, not weeks.

Spec document
02

Design

Define your system components, data models, and API specifications with reasoned trade-offs, replacing opaque black-box decisions with full transparency.

Architecture design
03

Tasks

Get prioritized, actionable tasks and milestones with clear deliverables. Prepare your project for seamless integration with GitHub or Jira.

Structured workplan

Not another AI chatbot

Why it's different.

It's not a chatbot. It's an interview architecture.

Each stage is a structured, adaptive conversation. The system asks the right questions, challenges assumptions, and surfaces edge cases that static prompts (and humans) routinely miss.

Built to find what you haven't thought of yet.

Most AI tools build on whatever assumptions are in your initial prompt. Tullius is built to challenge them, proactively identifying blind spots and never drifting beyond the verified scope.

Calibrated to your expertise.

The same rigorous process, whether you're defining the vision or designing the system.

Pricing

Start for free. Upgrade as you grow.

Every plan includes Tullius' guided interview system. Choose a plan and start building.

Free

Discover what Tullius can do as your personal architectural partner.

$0

Free forever

Includes

  • 1 spec session

Solo

For ongoing solo work — more projects each month, with the freedom to edit as you go.

$20/mo

Billed monthly

Includes

  • 1 full project / month
  • Complete specification, design, and tasks workplan
  • Edit your projects anytime

Pro

Take Tullius to the next level with tools that meet your professional needs.

$200/mo

Billed monthly

Includes

  • Multi-project support
  • Complete specification, design, and tasks workplan
  • Edit your projects anytime
  • Sync tasks to GitHub or Jira
  • Collaborate with colleagues
  • Priority support

Squad

Coming soon

Implement Tullius as an architectural partner across your whole team.

 

 

Contact us

Get ready to

  • Accelerate your dev cycle
  • Manage multiple seats
  • Plan with full source code context
  • Custom shared workspace

Contact us

Get in touch.

Have a question about Tullius, need help getting started, or want to explore what we can do for your team? We're here.

Ask us anything

Questions about the product, pricing or partnerships. We read every message.

Email us

Team inquiries

Looking to roll out Tullius across a team or department? Let's talk about how to set up a consistent planning pipeline at scale.

Email us

Ready to plan your next project?

Describe your idea. Tullius handles the rest: the questions, the structure, the documents. You make the decisions.

Start planning
Tullius