Is FullSeam profitable in 2026?

No. CB Insights recorded FullSeam revenue at $0 as of January 31, 2026. A March 28, 2026 investor blog post claims contract ARR reached $185K with 85% month-over-month growth, but this figure is vendor-claimed and unconfirmed independently.

Has FullSeam raised funding, and how much?

Sources conflict. CB Insights lists a $500K convertible note dated February 1, 2026. Caplight lists $1M total raised with a Seed round on March 25, 2026. An investor blog claims a $5M raise in March 2026, but that figure is vendor-claimed and unconfirmed.

How many employees does FullSeam have?

FullSeam had 3 employees as of LinkedIn's February 19, 2026 snapshot and still 3 employees per YC's directory on July 25, 2026, indicating flat headcount over roughly five months.

Who are FullSeam's biggest competitors?

Closest peers are AI-native ERP rivals Campfire (reportedly raised over $100M from Accel and YC in 2025) and Rillet (backed by Sequoia, Andreessen Horowitz, and ICONIQ, per a February 26, 2026 comparison), plus fellow YC W26 startup Balance and incumbents Bill.com, NetSuite, SAP Concur, and Sage Intacct.

Does FullSeam have named customers?

No independent customer logos were found as of March 14, 2026. FullSeam's own site references only an anonymous customer testimonial about AP automation, with no customer count or names disclosed publicly.

Could AI replace FullSeam itself?

FullSeam is exposed because it holds no proprietary data, unique integrations, or lock-in beyond SOC 2 Type 1 certification as of 2026, and larger-funded rivals like Campfire and Rillet could absorb its AR/AP agent function as a feature of their AI-native ERP platforms.

YC Winter 2026 · United States

FullSeam

3-person startup building AI agents to automate AR/AP for corporate accounting teams.

Losing its protection

Assessed 27 July 2026 · Evidence as of 27 July 2026

The structural protection is eroding.

On the recordSince 27 July 2026 · Checkable from March 2027 · Every call on the record Checkpoint: Target of $3M ARR within 12 months of its raise

The call

FullSeam is chasing a real, crowding market with no named customers yet, leaving little time before better-funded rivals or the ledger owners absorb the same idea.

FullSeam is a three-person startup that uses AI to handle accounts receivable and payable work that companies currently do by hand or with older software. The challenge is that bigger, established companies like Bill.com and NetSuite can add AI agents to their existing products without much effort, and well-funded startups like Campfire are building entire new accounting systems from scratch with AI already built in. FullSeam's best shot is to become so deeply tied into its customers' daily work routines that switching away becomes painful, but it has to do this in the next 12 to 18 months before the competition gets too far ahead.

Why

AI pressure: Campfire and Rillet (AI-native accounting platforms). Both are racing to fold AR/AP agent work into their own ledgers, which would make FullSeam's layer-on-top approach redundant. Could AI do the core job? Yes, likely.

Bigger players: Bill.com, NetSuite, Sage Intacct, SAP Concur. None has shipped agentic AR/AP yet, but each owns the ledger and could bolt on the same automation as a paid feature. Could a giant copy it? Yes, easily.

What protects it. It sits on top of existing systems without forcing a migration, buying time before bigger players copy the workflow.

What would change this call

FullSeam names 5+ referenceable mid-market customers with multi-quarter retention within 12 months. Would show real workflow lock-in instead of just a product demo.
Bill.com, NetSuite, or Sage Intacct ships native agentic AR/AP as a paid feature by mid-2027. Would show incumbents can absorb FullSeam's niche without a business-model conflict.
Campfire or Rillet publicly announces an AR/AP agent feature within their ERP platform. Would show a better-funded near-twin locking the niche before FullSeam.

Key numbers

3 employees listed on LinkedIn (2026-02-19)
Public launch via Launch YC (2026-02-17)
Holds SOC 2 Type 1 certification (2026-07-25)

Named risks

No independently confirmed revenue or named customers as of mid-2026. Severity: high
Conflicting funding figures ($500K to $5M) across sources signal weak transparency. Severity: medium
Flat headcount at 3 employees for five months despite claimed growth. Severity: medium
Better-funded near-twins (Campfire, Rillet) could absorb AR/AP agent as an ERP feature. Severity: high
Incumbents (Bill.com, NetSuite, Concur, Sage) can bolt on agentic features without structural blockage. Severity: high

Rivals, as read in July 2026

Rival	Direction	Evidence
Campfire	losing to	Reportedly raised over $100M from Accel and YC in 2025 versus FullSeam's disputed $500K-$5M
Rillet	losing to	Backed by Sequoia, a16z, and ICONIQ as AI-native ERP, per Feb 26, 2026 comparison
Balance	contesting	Same YC W26 batch, competing AI accounting agent model combining agents with human experts
Bill.com, NetSuite, SAP Concur, Sage Intacct	contesting	Own the systems of record FullSeam plugs into and can bolt on agentic AR/AP features
Puzzle	contesting	Vendor claims auto-processing up to 98% of transactions, Jan 28, 2026
Vic.ai	contesting	Established AP automation player claiming 97-99% AI accuracy on invoice processing

Questions people ask

Is FullSeam profitable in 2026?: No. CB Insights recorded FullSeam revenue at $0 as of January 31, 2026. A March 28, 2026 investor blog post claims contract ARR reached $185K with 85% month-over-month growth, but this figure is vendor-claimed and unconfirmed independently.
Has FullSeam raised funding, and how much?: Sources conflict. CB Insights lists a $500K convertible note dated February 1, 2026. Caplight lists $1M total raised with a Seed round on March 25, 2026. An investor blog claims a $5M raise in March 2026, but that figure is vendor-claimed and unconfirmed.
How many employees does FullSeam have?: FullSeam had 3 employees as of LinkedIn's February 19, 2026 snapshot and still 3 employees per YC's directory on July 25, 2026, indicating flat headcount over roughly five months.
Who are FullSeam's biggest competitors?: Closest peers are AI-native ERP rivals Campfire (reportedly raised over $100M from Accel and YC in 2025) and Rillet (backed by Sequoia, Andreessen Horowitz, and ICONIQ, per a February 26, 2026 comparison), plus fellow YC W26 startup Balance and incumbents Bill.com, NetSuite, SAP Concur, and Sage Intacct.
Does FullSeam have named customers?: No independent customer logos were found as of March 14, 2026. FullSeam's own site references only an anonymous customer testimonial about AP automation, with no customer count or names disclosed publicly.
Could AI replace FullSeam itself?: FullSeam is exposed because it holds no proprietary data, unique integrations, or lock-in beyond SOC 2 Type 1 certification as of 2026, and larger-funded rivals like Campfire and Rillet could absorb its AR/AP agent function as a feature of their AI-native ERP platforms.

Timeline

2026-07-25YC directory still lists FullSeam at 3 employees
2026-05-13Caplight lists total funding raised as $1M with Seed round
2026-03-28Velocity Catalyst blog claims $5M raise and $185K cARR (vendor-claimed, unconfirmed)
2026-03-25Caplight-recorded Seed round date
2026-03-14FullSeam site shows no-migration AI agent product, anonymous testimonial only
2026-02-25Fondo blog covers FullSeam launch
2026-02-19LinkedIn shows FullSeam at 3 employees
2026-02-17FullSeam publicly launches via Y Combinator Launch YC
2026-02-01CB Insights records $500K convertible note
2022Founders' prior company TaxProper acquired by Opendoor

Revision history

27 July 2026

First assessed. Losing its protection. The text above is fixed as of this date and is not edited afterwards.

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