If I had to sum it up fast: Sharesight may fit return reporting, while Mezzi may fit tax and overlap review across multiple accounts.
If I’m comparing these two tools, the split is pretty simple:
- Sharesight may work better for historical performance tracking
- Sharesight may also work better for tax records and exports
- Mezzi may work better for tax-loss harvesting review
- Mezzi may be more useful for wash sale checks across accounts
- Mezzi may also show overlap inside ETFs, mutual funds, and stocks
- Mezzi may give a household-level view across taxable accounts, 401(k)s, IRAs, and Roth IRAs
That difference may matter more if I hold assets in more than one place. A single-account investor may mostly want return reports. A multi-account household may care more about hidden overlap, asset placement, and wash sale risk.
Sharesight vs Mezzi: Which Portfolio Tool Is Right for You?
Quick Comparison
| What I’m comparing | Sharesight | Mezzi |
|---|---|---|
| Main job | Performance and tax reporting | Tax and overlap review across accounts |
| Return tracking | Yes - includes dividends, fees, and currency effects | Not the main focus |
| Historical reports | Yes - custom date ranges and long history | Limited focus |
| Tax documents | Yes - capital gains and taxable income records | Focused more on tax ideas than tax forms |
| Tax-loss harvesting review | No built-in alerts | Yes - flags candidates during the year |
| Wash sale tracking across accounts | No | Yes |
| Overlap detection inside funds | No | Yes |
| Household view | Partial | Yes |
One example from the article stands out: if two funds hold much of the same large-cap stocks, but one charges 0.03% and the other charges 0.75%, the fee gap may be about $720 per year per $100,000 invested. That doesn’t prove one choice is right. But it may show why overlap review matters.
So if I want a clean record of what happened, Sharesight may be the better match. If I want help spotting what may need attention now across all my accounts, Mezzi may be the better fit.
Where Sharesight stands out: performance tracking and tax reporting
Sharesight stands out most when the goal is to see how a portfolio has performed over time. It uses a money-weighted return that reflects cash flows, fees, dividends, and currency moves. That may make it a strong fit for historical reporting, especially for people who want a clear record of what happened rather than portfolio guidance.
Performance reports built for historical clarity
The Performance Report lets you pick custom date ranges and review more than 20 years of history. You may also switch between open positions only and open plus closed positions. That may be handy when reviewing an older strategy that included trades you already sold.
You may also break results down by sector, country, or custom groups. Then, with Contribution Analysis, you can see which holdings were tied to returns. Sharesight also supports benchmarking against a large universe of global stocks, ETFs, and mutual funds.
That same report structure carries over into tax records, which is where Sharesight's second strong point starts.
Tax reports for record-keeping, not tax strategy
Sharesight organizes tax-related data into a Taxable Income Report and a Capital Gains Tax (CGT) Report, where available. These reports cover realized gains, losses, dividends, and withholding details for a selected period.
You may export them to PDF or CSV and share them with an accountant or tax preparer. In plain English, they work more like documentation than direction. They record what happened, but they do not guide tax decisions.
Where Sharesight falls short for multi-account investors
For people with more than one account, the limits may show up pretty fast. Sharesight tracks each portfolio separately, so it does not monitor cross-account wash sales, tax-loss harvesting signals, or asset-location opportunities.
It may show sector and country exposure, but it does not detect overlapping underlying holdings across ETFs or mutual funds. So if someone wants cross-account tax awareness and overlap detection - not just a clean look back at past performance - there may still be a gap.
That is the point where tax-aware guidance and overlap detection may become more useful.
Where Mezzi stands out: tax optimization and overlap detection across all accounts
Where Sharesight stops at reporting, Mezzi goes a step further with tax and overlap insight across connected accounts. Mezzi connects in read-only mode and looks at your full household portfolio across taxable and retirement accounts. The main draw is that it surfaces ideas you may want to consider, while you keep full control over what, if anything, gets done.
Tax-aware guidance without giving up control
Mezzi scans taxable holdings for unrealized losses and flags tax-loss harvesting candidates throughout the year - not just in December, when markets may already be moving fast. If you sell a position to realize a loss, Mezzi tracks the 30-day wash sale window and notifies you when that window has passed, so you may rebuy without accidentally triggering a wash sale across multiple accounts.
That cross-account view also matters for asset location. Some investors place harder-to-manage holdings - like high-yield bonds or actively traded strategies - in tax-advantaged accounts, while keeping more tax-efficient index funds in taxable accounts. Because Mezzi reviews your combined account setup, it may point out where specific holdings fit better instead of looking at each account on its own.
That same household-level view also makes duplicated exposure easier to spot.
Portfolio X-Ray for duplicated exposure and concentration risk
Mezzi's Portfolio X-Ray breaks funds down into their underlying holdings, then compares those exposures across ETFs, mutual funds, and individual stocks in every connected account. The result is a plain-English view of where the same stock or sector may show up more than once - even when the fund names look totally different on paper.
This matters for both risk and cost. For example, holding VOO alongside an actively managed large-cap fund may leave you with much of the same underlying exposure while charging very different fees. In the example provided, VOO has a 0.03% expense ratio and the actively managed fund has a 0.75% expense ratio. That gap adds up to about $720 per year for every $100,000 invested. Mezzi may surface that kind of overlap so you have a clearer view of where you may be paying twice for similar exposure.
Multi-account planning built on connected data
Because Mezzi sees the full household picture, it may flag situations that might otherwise stay hidden - like a "balanced" 401(k) being offset by aggressive taxable positions, or a Roth account that may hold too much cash or lower-growth assets. Retirement projections are built from your actual account data instead of generic calculator inputs, which may make the output more relevant to your situation. Those differences show up most clearly in the side-by-side comparison below.
Sharesight vs Mezzi: side-by-side by investor job
Comparison table: reporting depth vs tax and overlap intelligence
After the feature breakdown above, this table lays out the day-to-day tradeoff: reporting depth on one side, and tax-aware portfolio intelligence on the other.
| Investor Job | Sharesight | Mezzi |
|---|---|---|
| Track returns accurately (dividends, splits, currency) | ✅ Detailed time-weighted and money-weighted returns that include dividends, splits, and currency effects | Not its primary strength |
| Historical performance reporting | ✅ Multi-period, multi-currency, contribution analysis | Not the main focus |
| Portfolio grouping (sector, country, custom) | ✅ Flexible grouping and labeling across all connected accounts | ✅ Combined or separate view across all connected accounts |
| Tax record-keeping (capital gains, trade history) | ✅ Capital Gains Tax reports, All Trades, Historical Cost | Focuses on tax optimization, not tax reporting |
| Tax-loss harvesting guidance | ❌ No proactive alerts | ✅ Year-round identification of candidates |
| Wash sale monitoring across accounts | ❌ Manual tracking required | ✅ Cross-account wash-sale risk tracking |
| Overlap detection (underlying fund holdings) | ❌ Not a core feature | ✅ Portfolio X-Ray across ETFs, mutual funds, and stocks |
| Household-level aggregation | Partial - separate portfolios per account | ✅ Combined view across all accounts |
Which investor profile fits each platform
That gap tends to matter most when you line up the platform with the job you want it to do.
Sharesight may fit best if your main goal is precise return measurement and clean documentation. For some investors, that may mean exporting a Capital Gains Tax report each April and checking how each holding may have performed over time.
Mezzi may fit best if you have meaningful assets spread across multiple account types and want more than a historical record. Its value may show up when overlapping funds hide the same holdings, and when multiple accounts may make tax opportunities harder to spot.
Conclusion: choose reporting clarity or tax-aware portfolio intelligence
After looking at both tools side by side, the main question may come down to the job you want the software to do. Are you mainly looking for cleaner performance reporting, or do you want more day-to-day tax and portfolio insight?
Sharesight may be a strong fit if your main goal is historical performance reporting. It may work well as a reporting tool, rather than a tax planning tool.
That may make Sharesight more of a record-keeping tool, while Mezzi may be more of a portfolio-intelligence tool.
Mezzi may fit better for people managing assets across multiple account types who want tax and overlap guidance. That may include spotting tax-loss harvesting opportunities, flagging wash sale risk across accounts, and surfacing overlap through its Portfolio X-Ray - while leaving the decisions and execution up to you.
In simple terms:
- Choose Sharesight for return reporting and tax records.
- Choose Mezzi for tax-loss harvesting, wash sale risk, and overlap detection across accounts.
Investing involves risk, and past performance does not guarantee future results. Tax-related insights are general information only; consult a qualified tax professional before acting on them. Results depend on complete account and transaction data.
FAQs
Do I need Mezzi if I only have one account?
Yes. Even with one account, Mezzi may still be useful.
It offers performance benchmarking against major indexes like the S&P 500, Dow, and Nasdaq. It also includes AI-powered insights that may help spot tax-loss harvesting openings and avoid wash sale risks your brokerage may not flag.
How does Mezzi find overlap inside ETFs and mutual funds?
Mezzi uses AI to analyze your portfolio and break down each ETF and mutual fund into its underlying holdings.
With secure, read-only account connections, it may calculate your total exposure to specific stocks across accounts and point out things like redundant holdings, sector concentration, and duplicate fees. That may give you a clearer view of your diversification beyond the fund names.
Can Mezzi help me avoid wash sales across all my accounts?
Yes. Mezzi monitors your full portfolio across connected taxable, retirement, and spousal accounts to help flag potential wash sale risks.
It alerts you during the 30-day wash sale window, suggests tax-aware rebalancing alternatives, and lets you know when the window has passed so you may rebuy without triggering wash sale issues.
Disclosures:
- This content is for informational purposes only and does not constitute investment advice or a recommendation to buy or sell any security.
- Past performance is not indicative of future results. No guarantee of future performance or outcomes is implied.
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