Cairnul and Carta both help startups manage equity and fundraising, but they are built for different needs.
Cairnul is an agentic, document-centered platform for first-time founders running early fundraising rounds. It connects SAFEs, investors, advisor agreements, documents, governance, compliance, and the cap table in one workflow built around the first 12 to 18 months of a company's equity life.
Carta is a broader equity management platform for private companies. It covers cap tables, securities, fundraising, employee equity, valuations, reporting, compliance, and other equity workflows as companies grow.
Choosing between them
Neither product is universally better. Cairnul is more focused on the early fundraising workflow, while Carta offers broader equity infrastructure for companies with more extensive equity management needs.
At a glance
| Category | Cairnul | Carta |
|---|---|---|
| Best fit | First-time founders running an early fundraising round | Private companies needing broader equity management |
| Fundraising | Round-centered workflow connecting investors, SAFEs, documents, governance, and compliance | SAFE fundraising, deal workflows, modeling, closings, and broader equity management |
| Cap table | Three connected ledgers covering issued stock, advisor grants, and SAFEs, each linked to the documents behind it | Broader cap table and securities management connected to equity plans and other workflows |
| Documents | Document-centered workflow with provenance, connected records, and Data Room | Data rooms, board consents, investor updates, and equity documentation |
| Governance and compliance | Focused on fundraising authorizations, board actions, accreditation, Rule 506(b) and 506(c), filings, and related records | Broader coverage including 83(b), 409A, Rule 701, reporting, and other equity compliance |
| AI and automation | AI Startup Advisor with document-aware assistance and a fixed set of bounded actions | Automation across equity, fundraising, modeling, compliance, and cap table workflows |
| Pricing | Free until you open a round. Then $110 a month billed yearly, or $130 monthly, per company. The investors and advisors you invite pay nothing to take part, and Cairnul takes no percentage of the raise. | Free Launch plan for companies under 25 stakeholders that have raised up to $1M, then paid packages priced per stakeholder with a minimum annual fee, plus optional add-ons |
| Growth focus | Early equity lifecycle and first 12 to 18 months | Broader equity infrastructure designed to scale with the company |
Pricing, features, availability, and product offerings can change. Please confirm current pricing, features, and terms directly with each provider.
Seven differences
Cairnul
Cairnul organizes fundraising around the Round. The Round connects the raise terms, Investors, SAFEs, compliance steps, board authorization, documents, and close, and the terms on offer sit inside it as board-authorized term sets.
This gives the founder a structured fundraising record where the people, terms, approvals, documents, and compliance steps involved in the raise remain connected, and where no SAFE can be sent on terms the board has not signed off on.
Carta
Carta also provides an integrated SAFE fundraising workflow, including agreement creation, signatures, funding, tracking, modeling, and deal management.
The key difference is focus: Cairnul is built around executing an early fundraising round and the authorizations that sit under it, while Carta connects fundraising to a much larger equity management system.
Cairnul
Cairnul treats the SAFE as part of the complete fundraising record. A SAFE connects to its Round and term set, its Investor, the accreditation evidence relied on, funds confirmation, signer information, and the resulting Position, and Cairnul ships standard, unmodified industry forms rather than authoring custom ones.
That means the SAFE is not treated as an isolated document or transaction, and a later reviewer can see which terms were authorized, who was accredited on what basis, and when the money arrived.
Carta
Carta supports Carta, YC, and custom SAFE templates and provides tools to create, issue, sign, fund, and track SAFEs.
That template flexibility is a genuine reason to choose Carta if your round involves modified or negotiated SAFE terms, since Cairnul fills standard forms rather than editing them and sends custom terms to your own lawyer. Choose based on what you need around the SAFE: a structured first-round workflow with Cairnul, or broader SAFE and equity infrastructure with Carta.
Cairnul
Cairnul's cap table is built from three ledgers: issued stock, advisor grants with their own vesting, and SAFEs tagged to the Round and exemption they were sold under. Each position traces back to the document that created it, and updating shares or the option pool requires a supporting document attached as justification.
This keeps ownership information connected to the underlying activity, so the founder can explain not just what the cap table says but which agreement, consent, or issuance produced each line on it.
Carta
Carta's cap table is part of a larger equity management system covering securities, stakeholders, equity plans, exercises, transfers, scenario modeling, reporting, and other ownership workflows.
Cairnul keeps the cap table tied to the documents behind each position. Carta makes the cap table part of a broader equity administration system with more modeling and reporting built around it.
Cairnul
Cairnul treats documents as evidence behind the company's fundraising and governance record. Documents such as SAFEs, board actions, compliance records, and company agreements remain connected to the workflows that use them, and every fact on the record carries its provenance: whether the founder declared it, a document proves it, or the founder has confirmed what the system read.
This gives the founder a structured record in which the documents supporting a fundraising action stay connected to the people, approvals, transactions, and compliance information associated with it. Shared documents are watermarked per recipient and viewable in the browser, and downloads happen only with the founder's approval.
Carta
Carta provides secure data rooms and connects documentation with workflows such as investor updates and board consents.
The distinction is less about whether either platform stores documents and more about how central those documents are to the product's underlying workflow.
Cairnul
Cairnul connects governance and compliance directly to the fundraising process, including board actions, signer sets, accreditation workflows, Rule 506(b) and 506(c), Form D preparation, and state notice filings. The people who need to sign a consent are computed from the board roster as it stood on the action date, confirmed by the founder before the document is generated, and pinned to that action afterwards.
This means the approvals behind a raise are recorded as the company actually authorized them, so a founder asked later who approved a round, or on what date, can answer from the record rather than from memory.
Carta
Carta covers a wider range of equity administration and compliance, including 83(b), 409A valuations, Rule 701, financial reporting, and related audit support.
The practical split is timing. Cairnul covers the governance work that sits around the raise itself, while Carta covers the ongoing administration and reporting obligations that accumulate afterwards.
Cairnul
Cairnul's AI Startup Advisor opens as a side panel on whatever page the founder is working on and is given that page and its object as context, so a question about the round being configured or the consent awaiting signature does not have to be explained first. It works from a fixed, defined set of actions, and it never signs, files, or approves anything.
This means the assistance is grounded in the information already connected to the founder's current workflow, while the acts that create legal consequence stay with the founder.
Carta
Carta uses automation across its broader equity platform, including cap table updates, fundraising, modeling, and compliance workflows.
The difference is primarily what the automation is pointed at: Cairnul puts it next to the founder's current fundraising task, while Carta applies it across a wider surface of equity administration.
Cairnul
Cairnul is intentionally focused on the early equity lifecycle, particularly the first 12 to 18 months. It supports Delaware C-Corps raising under Rule 506(b) or 506(c) on post-money SAFEs, and advisor grants alongside them.
That focus gives the platform a defined scope around the fundraising journey and the records, workflows, and equity activity associated with that stage, and it also sets a clear boundary: a priced round, employee equity programs, and later equity administration sit outside it.
Carta
Carta is designed to extend further into employee equity, securities administration, 409A valuations, financial reporting, Rule 701, and later-stage equity management.
That creates a straightforward trade-off: Cairnul is optimized for the early fundraising journey; Carta is designed to become broader equity infrastructure as the company grows.
The real world
A first-time founder posted in r/startups, partway through raising a friends and family round on a 506(b) offering. They had already missed their 83(b) election at incorporation and some California state filing deadlines, and were trying to work out how much of a first raise is pitching and how much is paperwork nobody warned them about.
It is a common position to be in. Most fundraising advice covers the pitch. Very little of it covers what has to be in order before anyone says yes.
First-time founder, already started to raisereddit.comhow much of it was pitching versus documents? And is there anything you'd get sorted before you start rather than during?
A solo hardware founder asked whether they could raise a small round from friends and family on a standard YC post-money SAFE, or whether everyone involved had to be an accredited investor. They had read contradictory answers and could not work out which was right.
The replies did not settle it. One said the SAFE only works with accredited investors. Another pointed out that Rule 506 permits up to 35 non-accredited investors. A third said it was a non-issue. All of it from people who had raised.
Can you raise money from family and friends with a YC post-money SAFE?reddit.comI keep hearing mixed things, some people are saying I cant raise from friends and family via a Y combinator SAFE and they must be accredited investors.
Cairnul and Carta both handle parts of this. Which one fits depends on whether your immediate problem is the round in front of you or the equity infrastructure that comes after it.
Questions founders ask
It can be, depending on what your company needs. Cairnul is built around early fundraising and the connected documents, investors, advisors, governance, compliance, and cap table behind it. Carta covers a wider range of equity management workflows, including services that Cairnul does not provide.
Yes. Already executed SAFEs can be uploaded at any time and are placed into the Round and term set they match, and authorized shares, issued shares, and the option pool can be updated with a supporting document attached as the record behind the change. Cairnul then keeps those positions connected to the documents that created them.
No. What Cairnul does require is the option pool: the grant cannot complete until the pool is recorded with the document behind it. If a valuation document is already in your workspace, Cairnul can read the value and prefill the exercise price for you to review. If there is no valuation document, you enter the price yourself and carry on. Each grant records where the number came from.
Yes, and it does not require an open round. Cairnul uses the standard FAST agreement, generates the board consent that authorizes the grant, produces the restricted stock or option agreement, tracks vesting from the date the board approved, and creates the 83(b) task where one applies.
No. Funds move directly from the investor's bank account to the founder's business bank account. Cairnul records the wire instructions, the founder's confirmation that funds arrived, and the receipt where one exists, and charges a subscription rather than a percentage of the raise.
When the equity work stops being about the raise. A priced round, an employee option program, recurring 409A valuations, Rule 701 tracking, and GAAP reporting are all outside what Cairnul covers, and a company at that point needs broader equity infrastructure.
Your first raise creates more than a cap table entry. It creates a record of investors, documents, approvals, compliance, and ownership.
Keep the whole round connected with Cairnul.