Monsa vs Sharesight: Which One Keeps You Honest About Your Own Strategy?

Sharesight tracks performance and tax. Monsa scores your holdings against the strategy you wrote down. They solve different problems, and most serious operators end up wanting both.

What Sharesight does

Sharesight is a portfolio tracker and tax-reporting tool built for investors who hold positions across multiple brokers and want one place to see performance, dividends and capital gains. You bring in your holdings, either through a broker connection, trade confirmation emails, or a CSV import, and it prices them, tracks dividend reinvestment, and generates capital-gains and dividend-income reports formatted for tax filing. Its free plan caps the number of holdings you can track; paid plans raise that ceiling and add more portfolios and reporting.

What Monsa does

Monsa holds the rules you wrote for how you invest and checks every stock in your book against them, every night. You describe your strategy in a sentence, Monsa proposes criteria and thresholds from it, and you accept or edit each one before it goes live. From then on, each tracked ticker gets a fit score from 0 to 100, a verdict of fits, borderline or violates, and a breakdown of exactly which criterion moved the number. Nightly re-scoring means a holding that quietly stopped matching your thesis shows up before you go looking for it.

Where they overlap

Both tools want your holdings, not just a watchlist. Sharesight and Monsa each let you bring in the positions you already hold, either by connecting a broker or importing them by hand, and both give you a portfolio view of what you own today. If you already keep your book in Sharesight, adding the same tickers to Monsa is a five-minute step, not a migration.

Where they don't

This is the part that actually matters when picking between them, or deciding you need both.

Sharesight answers "how has this portfolio performed, and what do I owe tax on." It is built around historical returns, dividend income and the reports an accountant or a tax authority wants to see. That is a real, well-scoped job and Sharesight is built for it.

Monsa answers a different question entirely: "does what I hold right now still match the rules I set for myself." It has no return or performance reporting at all, because that is not what it measures. What it measures is discipline, how tightly your book tracks its own strategy, using a criteria DSL you write and Monsa checks deterministically wherever a number can settle the question, with a qualitative layer for the judgment calls a formula can't make. Every position gets re-scored nightly, so drift between what you own and what you said you'd own shows up on its own instead of waiting for you to remember to look.

Put plainly: Sharesight tells you what happened to your money. Monsa tells you whether you're still the investor you said you'd be.

Who should use which, or both

If your priority is tax season and performance reporting across brokers, Sharesight is built for exactly that and Monsa doesn't try to replace it. Monsa has no tax reporting and makes no performance claim for itself or for you; that is deliberately outside what it does.

If your priority is knowing, without checking by hand, whether a holding you bought for specific reasons still clears the bar you set, that is what Monsa does and Sharesight doesn't attempt it.

Plenty of operators run both. Sharesight handles the accounting side of owning stocks. Monsa handles the discipline side, whether the stocks you're still holding are the ones your own rules would let you buy today.

Pricing

Monsa is $19/month, or $100/year for the first 100 annual subscriptions as a founding operator. One plan, no free tier: 5 parallel portfolios, 50 tracked tickers, 100 AI analyses a month, and 5 price targets per ticker. Nightly auto-refresh plus on-demand re-sync keeps every score current.

Sharesight publishes its own pricing on its site, with a free plan capped at a small number of holdings and several paid tiers above it; check sharesight.com for current numbers, since we're not going to guess at a competitor's price list here.

Try Monsa

Monsa is at monsa.ai. The founding annual price is still open to the first 100 annual subscriptions; after that seat is gone, it's gone for the operators who didn't take it, though everyone keeps the operator number they're issued the day they join.

Related reading: Your Portfolio Is Drifting and Nothing Tells You looks at what happens when nobody's checking the rules, and the strategy writing template walks through turning a thesis into checkable criteria.

Monsa is a portfolio-analysis tool, not a broker or investment adviser. Nothing here is investment advice.