The human-in-the-loop spec layer for AI-assisted delivery
Whether you're a product team shipping features or an agency delivering client work, Sigil helps you scope with AI, get stakeholder sign-off, and deliver with confidence.
Who It's For
Built for teams that deliver
Client delivery, structured
Scope client projects with AI-drafted proposals, get formal sign-off through a branded portal, and track deliverables stage by stage. No more scattered emails or scope creep.
- ✓Branded stakeholder review portal
- ✓Stage-by-stage approval gates
- ✓PDF spec export for contracts
- ✓AI pipeline from proposal to tickets
Ship features with clarity
Turn product requirements into structured specs with clear deliverables and stakeholder approval. Keep engineering, design, and product aligned from scoping through delivery.
- ✓AI-powered spec drafting
- ✓Stakeholder approval workflows
- ✓Deliverable tracking per milestone
- ✓Real-time comments and collaboration
How It Works
Three steps to better project delivery
Propose
AI drafts project specs with clear deliverables, timelines, and estimates based on your input.
Approve
Stakeholders review and approve specs through a branded review portal. No back-and-forth emails.
Deliver
Track progress, share deliverables, and get stage-by-stage approvals. Everyone stays aligned.
End-to-End AI
One pipeline from idea to deployed code
Every step is AI-assisted with human approval gates. Specs trace all the way from stakeholder sign-off to the code that ships.
AI-Native Pipeline
From idea to shipping — AI at every step
AI Proposal & Spec Drafting
Describe your project and AI generates structured proposals with stages, deliverables, timelines, and cost estimates. Iterate with AI reps until it's right.
Stakeholder Review Portal
A branded portal where stakeholders review specs, approve stages, leave comments, and track progress — no account setup required.
Specs to Project Stages
Approved specs automatically map to project stages with deliverables, timelines, and ownership. AI structures the breakdown so nothing gets lost.
Stages to PRDs & Tech Specs
Each project stage generates detailed PRDs and technical specifications. AI turns high-level deliverables into implementation-ready documents.
PRDs to Tickets
AI breaks PRDs and tech specs into granular, actionable tickets. Every ticket traces back to the approved spec — full lineage from proposal to task.
MCP Ticket Access
Coding agents pull tickets directly via MCP. AI builds from specs your stakeholders approved — closing the loop from scoping to shipping.
Ready to ship with confidence?
From first proposal to deployed code — Sigil keeps stakeholders aligned and AI on track.