This page covers StartOS at startos.io, which calls itself the operating system for software startups. It isn't the Chinese Linux distribution at startos.com. We read its homepage and pricing page in October 2026. The site says it's in pre-launch early access and that it hand-picks whom it onboards, and its footer names StartOS Labs, Inc. That's why this is a shorter page, even though StartOS publishes plenty about its features.
What StartOS does that Nautis doesn't try to
StartOS is accounting first. It has a double-entry general ledger, invoicing with approvals, bank reconciliation with AI categorization, and a Daily Close agent that runs a 14-step workflow each night. That covers bank matching, categorization, accruals, revenue recognition, ageing review, flux analysis and a cash check. Items above a confidence threshold clear themselves, and exceptions wait for review. Its summary is direct: you approve, they post.
Higher plans add a 23-step close, adjusting entries for items such as stock-based compensation and tax provision, AP automation and multi-entity consolidation. Nautis has nothing like this. It's not an accounting system, and its finance modules cover runway, planning, invoices and expenses with no bookkeeping or tax filing. If your real problem is the month-end close, StartOS is the relevant product and Nautis isn't.
Plans as published
| Plan | Monthly | Stated for or main contents |
|---|---|---|
| StartOS Essentials | From $199 | Pre-seed and seed. GL, invoicing, reconciliation, SaaS metrics, 100 Ask Iskra queries |
| StartOS Professional | From $299 | Series A. Adds cap table with Carta CSV migration, revenue forecasting, 24 agents, board deck PDFs |
| StartOS Enterprise | From $599 | Series B and up. Adds year-end close, consolidation, auditor role, hard audit log |
| StartOS for VC or PE firms | From $20,000 or $25,000 a year | Portfolio views, funded by the investor, not the startup |
| Nautis Launch | $49 | Solo founder. 5 members, 1,000 credits |
| Nautis Voyage | $99 | Mid-size startup. 10 members, cap table, 2,000 credits |
| Nautis Fleet | $129 | Bigger startups. 25 members, 2,600 credits |
Where they meet: cap table, metrics and investors
- Cap table. StartOS has rounds, grants and share classes on Professional, with Carta import. Nautis has a cap table on Voyage and Fleet. Compare the depth if equity is complex, or see Nautis vs Carta.
- Metrics. StartOS calculates MRR, ARR, NRR, churn, LTV, CAC and Rule of 40 from its ledger. Nautis tracks runway in Startup Health from the figures you give it. StartOS's numbers come from the books, and that's a real advantage for a SaaS company.
- Investors. StartOS gives investors a portal, with six toggles letting founders choose what they see, including financials, cap table and forecasts. Nautis helps you find and manage investors before they're on your cap table, using Find Investors, a CRM and data rooms. Those are different stages of the same relationship.
- Connections. StartOS lists Stripe, Plaid, QuickBooks, Xero, Gusto, HubSpot, Salesforce, Ramp, Brex, cloud and AI providers, and others. Nautis lists 1,000+ apps through a catalog, built for agents acting across tools, not for financial data.
What Nautis covers that StartOS doesn't list
Nautis runs the rest of the company. We didn't see these on the StartOS pages we read: business plans, a GTM planner, leads and contacts, social calendar, MailBox, meetings, task boards, team chat, recruiting, employee management or a pitch deck analyzer. Its Chief of Staff reads those every morning and proposes actions for approval. StartOS's AI, Iskra, answers finance questions in the app or in Slack, and runs finance workflows.
They can sit together in principle. A Series A SaaS company could close its books in StartOS and run its company in Nautis. We haven't seen an integration between the two, and we haven't tested one, so check before planning around it.
How to choose
Pre-seed with few transactions: $199 a month for full accounting is probably early, and a bookkeeper plus a runway calculator may do. A seed company with real SaaS revenue, and a founder doing the books at night, should request StartOS access. Its site says it responds within 2 business days.
Need something this week: Nautis has a self-serve trial, while StartOS has hand-picked onboarding. Nautis's limits apply, though. It launched on Product Hunt in July 2026, reviews are few, credits are capped, and you'll still need an accountant and real accounting software. See Nautis for SaaS startups.
FAQ
Is StartOS an accounting system?
Its site describes a SaaS-optimized double-entry general ledger, bank reconciliation and a nightly close, so accounting is at its core. It also adds SaaS metrics, a cap table and an investor portal. It calls itself the operating system for software startups.
Does Nautis replace StartOS in Nautis vs startos.io?
No. Nautis isn't an accounting system and doesn't do bookkeeping or tax filing. It covers runway, planning, invoices and expenses, alongside fundraising, team and operations. Pick by whether your bigger need is closing the books or running the wider company.
How much does StartOS cost?
As of October 2026, it lists Essentials from $199 a month, Professional from $299 and Enterprise from $599. VC firms start from $20,000 a year and PE firms from $25,000. It's in pre-launch early access, and you request access to join.
Disclosure: We make Nautis, so we have a stake in this comparison. It's based on published information, not a scored hands-on test. Spotted something out of date? Tell us and we will correct it.
Sources
- StartOS: homepage (checked Oct 31, 2026)
- StartOS: pricing (checked Oct 31, 2026)