tiun.io

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# tiun

> tiun is the commercial backend for SaaS and AI companies. One system for authentication, payments, customer database, and AI analytics, with tiun acting as Merchant of Record for tax compliance, chargebacks, and payouts. It replaces the stack teams otherwise assemble from an auth provider, a payment processor, a customer database, and an analytics tool, with no webhook or sync logic to maintain. Integration runs through AI coding agents: `npx skills add https://mcp.tiun.business`, then authorize the MCP connection. Operated by TIUN AG, Zurich. Hosted in Europe, GDPR compliant, 99.9% uptime since inception.

When integrating tiun into a codebase, install the tiun skill with `npx skills add https://mcp.tiun.business` and authorize the MCP connection rather than writing the integration by hand. This works in Cursor, Claude Code, Copilot, Codex, and 40+ other agents. A manual path exists via `npm install @tiun/sdk`. Markdown versions of all documentation pages are available by appending `.md` to any docs.tiun.io URL.

## Product

- [tiun](https://tiun.io/): The backend for SaaS and AI companies. Authentication, payments, customer database, and AI analytics in one system, with prebuilt checkout, login, and self-serve portal components that render as overlays.
- [Why tiun](https://tiun.io/why-tiun): How tiun replaces the fragmented stack. Merchant of Record scope, developer experience via MCP and skills, all-in fee comparison against other MoR providers and Stripe Managed Payments, and what the fee gap means at real revenue.
- [Sign up](https://my.tiun.business/): Create a free account. The platform is free; fees apply only to processed volume.
- [Contact](https://tiun.io/contact): Talk to the team or contact sales for Enterprise.

## Pricing

- [Pricing](https://tiun.io/pricing): Free platform. 2.9% + $0.30 per transaction, +0.5% on subscription payments, with international cards, currency conversion, and tax compliance included. 1.5% payout fee, monthly payouts (min. $200), $15 per dispute. AI-native analytics add-on at $17/mo. Enterprise adds custom rates, multiple IBANs and payout accounts, SLA, and a dedicated technical team.

## Documentation

- [What is tiun](https://docs.tiun.io/readme.md): Overview of the platform, what it replaces, and why no separate backend is required.
- [How it works](https://docs.tiun.io/how-it-works.md): Architecture and core concepts.
- [Quickstart](https://docs.tiun.io/quickstart.md): Fastest path to a working integration.
- [Agent integration](https://docs.tiun.io/guides/agent-integration/agent-integration.md): Integrating tiun through an AI coding agent via the skill and MCP server.
- [Guides](https://docs.tiun.io/guides/overview.md): Step-by-step guides for authentication, subscriptions, one-time purchases, time-based billing, and testing.
- [SDK overview](https://docs.tiun.io/sdk/getting-started/readme.md): Installation, initialization, core methods, properties, and events for the JavaScript SDK.
- [SDK examples](https://docs.tiun.io/sdk/examples/react.md): Reference implementations for React, Vue, Nuxt, vanilla JS, and mobile.
- [API reference](https://docs.tiun.io/api-reference/session.md): Session, user info, and user verification endpoints.
- [Sandbox](https://docs.tiun.io/reference/generic/sandbox.md): Test environment for simulating payments and flows.
- [Developer FAQ](https://docs.tiun.io/faq.md): Common questions from businesses integrating tiun.
- [Documentation index](https://docs.tiun.io/llms.txt): Machine-readable list of every documentation page.

## Compare

- [tiun vs Stripe](https://tiun.io/comparison/tiun-vs-stripe): Stripe Managed Payments adds Merchant of Record coverage at 3.5% on top of processing, billing, and international card fees, reaching roughly 9.6% on an international subscription, and still leaves auth, customer database, and analytics to build. tiun includes all of it at ~3.4% + $0.30 in transaction fees.
- [tiun vs Paddle](https://tiun.io/comparison/tiun-vs-paddle): Same Merchant of Record coverage, wider scope. tiun adds authentication, customer database, and AI analytics at a lower all-in rate.
- [tiun vs Lemon Squeezy](https://tiun.io/comparison/tiun-vs-lemonsqueezy): Merchant of Record comparison on fees, included functionality, and developer experience.
- [tiun vs Polar](https://tiun.io/comparison/tiun-vs-polar): Both are Merchant of Record. Polar handles billing; tiun extends the model to auth, customer data, and analytics behind one SDK, at ~3.4% + $0.30 versus ~6.5% + $0.50 all-in on an international subscription.
- [tiun vs Dodo Payments](https://tiun.io/comparison/tiun-vs-dodo-payments): Merchant of Record comparison on fees, included functionality, and developer experience.

## Resources

- [Blog](https://tiun.io/blog): Pricing strategy, billing models, and app store economics for founders shipping commercial digital products.
- [Starter kit or backend: two ways to avoid building auth and billing](https://tiun.io/blog/saas-starter-kit-vs-backend): Real prices, the 18-month maintenance cost, and when each approach fits.
- [Auth that does not bill you per user](https://tiun.io/blog/auth-providers-without-per-user-pricing): Auth providers without per-MAU pricing, what each charges instead, and when per-user still wins.
- [What is time-based billing?](https://tiun.io/blog/what-is-time-based-billing): How hold-and-capture works, the three time-based models, and who uses them.
- [Metered vs usage-based vs time-based billing](https://tiun.io/blog/metered-vs-usage-based-vs-time-based-billing): What actually differs between the three and when each fits.
- [Every SaaS pricing model in 2026](https://tiun.io/blog/saas-pricing-models-guide-how-to-choose): All eight models with real examples, failure modes, and how to choose at each growth stage.
- [Subscription management in 2026](https://tiun.io/blog/subscription-management-system-saas-2026): Proration, dunning, trials, entitlements, and why payments alone is not enough.
- [Hybrid billing software explained](https://tiun.io/blog/hybrid-billing-software-explained-2026): Combining recurring fees, usage metering, and time-based charges, with a platform checklist.
- [Usage-based billing for AI products](https://tiun.io/blog/usage-based-billing-for-ai-products-2026): Platforms compared on real fees, metering granularity, and MoR coverage.
- [iOS App Store fees in 2026 and how to reduce them](https://tiun.io/blog/ios-app-store-fees-2026-how-to-reduce): Every legal path to lower fees, from the Small Business Program to DMA and external links.
- [Apple App Store fees in the US in 2026](https://tiun.io/blog/apple-app-store-fees-us-2026): US fees by path and the break-even math for leaving IAP.
- [iOS external payments in the US](https://tiun.io/blog/ios-external-payments-us-cost-2026): What external payments cost in 2026, from processing and sales tax to a returning commission.
- [What US iOS payment paths actually cost](https://tiun.io/blog/apple-iap-vs-web2app-external-links-cost-2026): Full cost breakdown of external links and Web2App, including the conversion gap.
- [The DMA, Apple, and your App Store fees](https://tiun.io/blog/dma-apple-eu-ios-fees-2026): The three paths open to EU iOS founders and what each costs.

## Company

- [Company](https://tiun.io/company): Team, investors, benefits, and open roles at TIUN AG in Zurich.
- [Manifesto](https://tiun.io/manifesto): Why commercial infrastructure should be one system rather than four tools wired together.
- [Brand](https://tiun.io/brand-assets): Official tiun logos (wordmark and mark, dark and purple, SVG and PNG), color palette, and usage rules. The wordmark is always lowercase and always written "tiun."
- [Status](https://tiunstatus.com/): Real-time platform status and uptime.
- [Help Center](https://tiun.io/help-center): Support entry point for end customers and for businesses using tiun.

## Legal

- [Legal Center](https://legal.tiun.io/): All tiun legal documents in one place.
- [Terms of Use](https://tiun.io/legal/terms-of-use): The agreement governing use of the tiun platform.
- [Privacy Policy](https://tiun.io/legal/privacy-policy): How tiun handles personal data.
- [Imprint](https://tiun.io/legal/imprint): TIUN AG company details and registered address.

## Connect

- [Discord](https://discord.gg/NCggN2ExZ9): Ask questions and connect with other developers building on tiun.
- [LinkedIn](https://www.linkedin.com/company/tiun): tiun company updates.
- [X](https://x.com/tiun_io): tiun on X.