cairnfund.com

What It Is

Cairn is a tax-aware retirement planning tool for individuals, positioned somewhere between bank wealth dashboards, FIRE spreadsheets, and expensive financial advisors. It emphasizes “five-minute setup,” readable retirement plans, realistic tax projections, and the ability to click any number to see the calculation behind it. It is worth noting that its terms of service clearly state that it does not provide financial, tax, investment, or legal advice.

Core Features and Differentiators

Its core modules include net worth and cash flow dashboards, AI Insights, real-time what-if sliders, Show the math formula tracing, withdrawal strategies, Monte Carlo simulations, RMD, IRMAA, Social Security taxation, and equity compensation modeling for RSU/ISO/NSO/ESPP. Compared with black-box calculators, Cairn’s main strength is auditability: the site says every number can be expanded to show the formula and inputs, with 267 calculation tests covering logic such as taxes, RMD, withdrawal strategies, and Monte Carlo simulations.

Pricing and Trial

Pricing is relatively straightforward. The free plan is free forever and includes a basic retirement calculator, net worth/cash flow tracking, CSV import, cross-device sync, and export. Monthly costs $4.99 per month and includes a 7-day trial. Pro is $39 per year and unlocks AI insights, real-time sliders, formula drill-down, three withdrawal strategies, Monte Carlo, and IRMAA shield. Lifetime is a one-time $99 payment and includes lifetime updates. All paid plans come with a 30-day money-back guarantee.

Data, Security, and Integrations

Cairn is a cloud-based SaaS product that uses Firebase Auth and Google Firestore, with data synced across devices. Its disclosures mention TLS in transit, Google AES-256 encryption at rest, and per-user security-rule isolation. Users can export JSON/CSV at any time and permanently delete their account in settings. It does not sell data or use marketing trackers; analytics are handled by cookie-free Plausible. Payments involve Stripe and Square, and the terms also mention Gemini. It does not disclose formal certifications such as SOC 2 or ISO 27001, nor does it offer a public API, self-hosting, or team permission features.

Pros, Cons, and Who It’s For

Its strengths are low pricing, a usable free plan, transparent calculations, fairly detailed coverage of U.S. tax rules, and avoiding Plaid-style bank scraping. Its weaknesses are that it is heavily tied to U.S. tax law and retirement systems, so its value is limited for non-U.S. users; it is also developed part-time by a solo founder, which creates uncertainty around enterprise-grade SLA and long-term service stability. It is suitable for U.S. individuals who want to independently compare retirement age, Social Security claiming, withdrawal strategies, and tax impact. It is not suitable as an enterprise finance system or as a compliant delivery platform for professional advisors.

Access from China and Alternatives

Access from mainland China, payment success rates, and network stability are not disclosed, so they should be considered unknown. Given its reliance on overseas services such as Google Firebase/Firestore and Stripe/Square, users in China may encounter network or payment uncertainty. For localized personal finance needs, domestic budgeting or financial planning tools may be more appropriate. For U.S. retirement planning, alternatives to compare include NewRetirement, ProjectionLab, Boldin, or FIRE spreadsheets.