Throughline
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The connected way to build

Your next big idea, without the lost context.

Go from a brief to a buildable plan. Throughline connects every requirement, decision, screen, and story so a change never leaves your team guessing.

Start a project Explore the workflow
A plan with a pulse

One idea / five connected artifacts

Lineage preserved
  1. 01 / INPUT

    Brief

    Your idea, users, and constraints.

  2. 02 / DEFINE

    Requirements

    What the product must do.

  3. 03 / DECIDE

    Architecture

    How each need is solved.

  4. 04 / DESIGN

    UI specification

    Screens traced to decisions.

  5. 05 / BUILD

    Backlog

    Stories with their reasons attached.

And when something changes...

Revise a requirement. See the decisions and stories it affects.

R-07 v3 2 items flagged

Every step has a source. Every change has a path.

Context loss is the default.

Planning artifacts are supposed to build on each other. In practice, the links between them live in memory — and memory doesn’t survive a revision.

Requirements drift silently

A requirement gets revised in a doc, a Slack thread, or someone’s head. Nothing tells the architecture or backlog that depended on the old version.

Architecture forgets its "why"

Six months later, no one remembers which requirement justified a decision — or whether it still applies after the requirement changed.

Approvals run on memory, not evidence

Reviewers approve a spec because it "looks right," not because they can see exactly what upstream changed and what it touches downstream.

The workflow

Move fast. Keep the thread.

Planning is rarely a straight line. Throughline makes it safe to generate, review, and revise without losing what each decision depends on.

  1. /01

    Start with the intent

    Write the brief once. Throughline turns it into connected requirements, architecture, UI specifications, and backlog stories.

    From an idea to a plan

  2. /02

    Keep people in control

    Review every draft, compare revisions, and approve the decisions that should become the source of truth.

    AI drafts · you decide

  3. /03

    Change without losing the why

    When an upstream item changes, follow its impact through the plan before you send work to your tools.

    Every dependency stays visible

Direct impact. Transitive impact. A reason for both.

When R-07 moves from v2 to v3, Throughline doesn’t just flag what points at it directly — it follows the chain, and it can always explain why a given item is on the list.

Upstream change
R-07v2 → v3

Sync conflict resolution: acceptance criteria revised for offline merge.

Direct impact
ADR-03ApprovedADR-03 depends on R-07 v2, now v3

Local-first storage layer cites R-07 directly for its conflict semantics.

Transitive impact
S-12DraftS-12 depends on ADR-03, which depends on R-07

Resolve a sync conflict inherits the flag through ADR-03, not from R-07 itself.

Flagged is not blocked.

An approved item can still be flagged — that’s deliberate. Flagged is a separate signal layered on top of status, not a fifth state competing with it. You can approve from a flagged item, but only with the warning visible and an explicit decision.

Every external write — GitHub init, Jira export, Stitch generate — shows current impact before you can confirm it.
Acknowledging a flag is one click — and it’s logged, so the decision has a record too.
Project health
2 flagged items
Flagged

S-12 would be flagged: it depends on R-07 v2 (now v3).

Also impacts ADR-03. Downstream implementation tasks should be reviewed before sprint confirmation.

Requirement-to-code trace98.4%
Unresolved dependencies2 items
ApprovedApproved but flaggedcan still be true at the same time.

Nothing gets overwritten. It gets superseded.

Every revision is a new version, not an edit in place. The old one stays readable, marked superseded, so you can always see what changed and when it stopped being current.

  1. v1SupersededServer timestamps decide conflicting writes.
  2. v2SupersededManual merge prompt on every conflict.
  3. v3ApprovedOffline 3-way merge preserves both edits.
Requirement diff: R-07v2 vs v3

Comparing R-07 v2 vs v3:

− Acceptance Criteria 3: Server timestamps decide wins on conflicting updates.

+ Acceptance Criteria 3: Offline 3-way merge preserves simultaneous field edits.

Downstream story S-12 and decision ADR-03 are flagged to adopt this change.

A human approves every artifact.

AI generates the draft. It never becomes the plan of record on its own. Four states, always visible, always distinguished by more than color:

Draft

Generated, not yet reviewed.

Approved

A human signed off — with or without a flag present.

Superseded

Replaced by a newer version of the same item.

Rejected

Explicitly turned down, with a reason attached.

Ships where you already work.

Every export is a read of the same lineage graph — not a separate copy that can go stale.

GitHub

Initialize a repo from the approved architecture, with current flags shown before you confirm.

Jira

Export the backlog as epics and stories, traced back to the requirements that produced them.

Stitch

Generate UI screens from the approved specification, sandboxed until you accept them.

Start a project that remembers why.

Free to start. Bring a brief, get requirements, architecture, UI specs, and a backlog — all linked, all the way through.

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