About FullSeam
Make your ERP AI-native. Without replacing it.
Automate close, reporting, and accounting workflows — with built-in controls and audit trails. Build your own AI agents with the oversight your finance team requires.
Product
What FullSeam does
Close Management
Not just a to-do list. FullSeam automates account reconciliations, workpapers, and journal entries, then routes each one to a reviewer, so the close gets done without adding headcount.
Build Custom Agents
Describe the work in plain English and FullSeam turns it into an agent that runs on your data, with the review steps and audit trail your team requires.
Cash Application & Reconciliation
Applies incoming payments to open invoices, including partials and splits, then reconciles your ledger against bank, card, and subledger data. Every match comes with its reasoning, and only the exceptions reach your team.
Create Custom Reporting
Ask for the report you need and FullSeam builds it from live ledger data, with charts, filters, and a workbook behind every number.
Why FullSeam
What makes FullSeam different
Automates the close, not just the checklist
vs FloQastFloQast is a checklist: it tracks who owns each close task, but your team still does the work. FullSeam automates the close tasks themselves and hands your reviewers finished reconciliations, workpapers, and journal entries.
Use Claude and ChatGPT on your own close data
vs NumericUnlike Numeric, FullSeam lets your team use Claude and ChatGPT on their own through our MCP server. Ask questions and run analysis on your close data in the AI tools your team already uses.
Live the same day, on the ERP you already use
vs BlackLineBlackLine is a separate platform with a lengthy implementation. FullSeam runs on top of QuickBooks Online, NetSuite, Oracle Fusion Cloud ERP, SAP, Sage, Microsoft Dynamics 365, and other major ERPs with no migration, and can be live the same day.
Accounting controls you won’t get from Claude or OpenAI alone
vs general-purpose AIFullSeam runs on frontier models like Claude, then adds what a chat window can’t: live connections to your ledger, preparer and reviewer sign-off, a full audit trail, and SOC 2 Type 2 and HIPAA controls. Our customers have passed SOC 1 audits with FullSeam in their close.
Customers
Who uses FullSeam
Corporate accounting teams at fast-growing companies, from the CFO to the staff accountants running the close.
- CFOs
- VPs of Finance
- VPs of Accounting
- Controllers
- Accounting managers
- Staff accountants
Finance teams that run on FullSeam
Team
The team behind FullSeam
Tom, Aaron, and Geoff built TaxProper together, paying more than $1 billion a year in property taxes for customers until Opendoor acquired it in 2022. As TaxProper grew, its accounting team was buried in invoicing, reconciliations, and exceptions: the software kept the records, but people still did the work. FullSeam is the teammate they wished they’d had.
Working together
How FullSeam works
Work where your team works
Every customer gets a shared Slack or Microsoft Teams channel with our team, plus email.
Same-day answers
We respond to every question the same business day.
Live the same day
Connect your ERP and files, set up your close and agents with us, and let agents run. Teams can be live the same day.
At a glance
Key facts
- Company name
- FullSeam, Inc.
- Type
- AI accounting software for corporate accounting teams
- Core offering
- AI agents that automate the close, reconciliations, and reporting on top of your existing ERP
- Founders
- Tom Dowling (CEO), Aaron Coppa (CTO), Geoff Segal (President)
- Backed by
- Y Combinator (Winter 2026)
- Headquarters
- San Francisco, CA and Chicago, IL
- Founded
- 2025
- Website
- fullseam.com
- Services
- Close management, custom agents, cash application and reconciliation, custom reporting
- Integrations
- ERPs: QuickBooks Online, NetSuite, Oracle Fusion Cloud ERP, SAP, Sage, Microsoft Dynamics 365, Workday, Xero, Acumatica, Infor. Billing and CRM: Stripe, Salesforce, HubSpot
- Onboarding
- Can be live the same day
- Security
- SOC 2 Type 2 compliant, HIPAA compliant; customers have passed SOC 1 audits using FullSeam
- Customers served
- Corporate accounting teams in real estate, fintech, logistics, insurance, security software, and AI
- Competitors
- Numeric, FloQast, BlackLine
FAQ
Frequently asked questions
Quick answers about FullSeam, the product, and the team.
How do FullSeam's AI agents work with our existing systems?
FullSeam agents connect directly to your existing tools — ERP, billing platforms, accounting software, and spreadsheets — through secure integrations. They read your data, apply your business rules, and take on work like close tasks, reconciliations, cash application, and reporting without requiring you to change systems or processes.
Do we need to change our processes or migrate platforms?
No. FullSeam is designed to work within your current stack. Agents adapt to your existing workflows and systems, so there's no migration, no retraining, and no disruption to your team.
How do we approve or validate agent actions?
Every agent action is logged and auditable. You can configure approval workflows, review agent outputs before they're finalized, and set guardrails to ensure accuracy and compliance with your policies.
What happens when an agent encounters an exception?
When an agent encounters something it can't resolve automatically — a mismatched payment, a missing PO, an unusual line item — it flags the exception and routes it to your team with full context. You stay in control of edge cases while the agent handles everything else.
How long does it take to get an agent running?
Teams can be live the same day. Connect your systems, configure your rules, and let agents start working.
Can we use FullSeam from Claude or ChatGPT?
Yes. FullSeam’s MCP server connects your close data to Claude and ChatGPT, so your team can ask questions and run analysis in the AI tools they already use.
Is FullSeam secure?
FullSeam is SOC 2 Type 2 compliant and HIPAA compliant, and our customers have passed SOC 1 audits with FullSeam in their close. Every agent action is logged, and reviewers sign off on work before it’s final.
Who is behind FullSeam?
FullSeam was founded in 2025 by Tom Dowling, Aaron Coppa, and Geoff Segal, the team that built TaxProper (YC S19) before its acquisition by Opendoor. FullSeam is backed by Y Combinator (Winter 2026).
Keep your ERP. Lose the manual work.
See FullSeam run your close, reconcile your accounts, and build the reports and agents your team needs, on top of the ERP you already have. Live the same day.