About Sebastian

Accounting AI should make judgment more visible, not less.

Sebastian is an AI accounting and planning workspace built around a simple operating model: agents prepare the work, finance reviews it, and every important decision stays connected to its evidence.

Why Sebastian

Finance work is connected. The software should be too.

Accounting systems are good at storing final entries, balances, and reports. Finance teams still spend enormous energy reconstructing how the answer was reached: which source changed, which dependency cleared, who reviewed the exception, and why a version became authoritative.

Sebastian brings that operating record together. Close tasks, source evidence, draft journals, review boundaries, and forecast versions remain connected so the next action carries its context with it.

Context before action

Work begins with the period, accounts, dependencies, source evidence, and prior decisions—not an isolated prompt.

Evidence stays attached

Source snapshots and versions travel with the work so a reviewer can inspect where an answer came from.

Review is a product state

Draft, pending review, approved, and rejected are explicit states rather than invisible handoffs.

Plans retain their lineage

Forecast versions preserve authorship, parentage, changes, and the decision that made one version the plan of record.

Operating model

Agents prepare. Finance reviews.

The agent handles preparation: assembling source snapshots, checking dependencies, organizing supporting evidence, drafting balanced journal entries, and surfacing the exceptions that need judgment. The work arrives review-ready instead of context-free.

Finance keeps decision authority. Designated writes pause at approval boundaries, reviewers can inspect the proposed action and its evidence, and the resulting decision remains part of the operating record. Faster preparation should produce clearer review—not a black box.

Go deeper

See the work up close.

Sebastian AI accounting

See the close, journal, evidence, and early-access AP boundaries in one product view.

Month-end close

Inspect the implemented task, dependency, review, activity, and evidence workflow.

Security and trust

Review the platform security architecture and the claims Sebastian does not make.

Keep your ERP. Close and plan in one pane.

AI for accounting and FP&A on the ledger you already run. No migration. No rip and replace.

Agents at work · Matching an invoice to its PO line…