M1 Finance vs Mezzi: Which Is Better in 2026?

Prices checked October 2026. A price marked (Oct 2026) was read on the vendor's own pricing page; others are described without a number because we could not verify one.

A pie-based investing platform where you choose the holdings and target weights and M1 automates the rebalancing. Between a robo-advisor and a brokerage.

How it works: You build a Pie of stocks and ETFs with target percentages, and every deposit is allocated to whatever is furthest below target, which rebalances the portfolio through new contributions instead of sales. Trades execute in one or two daily windows, which is the design trade for the automation and the fractional-share support.

In practice, M1 Finance’s AI automates rebalancing toward weights you set. It is a robo-advisor (hands-off automated investing), best suited to people who want to choose the holdings but automate the maintenance. On connecting an account: no (holds your money at M1). On execution: automated within your chosen weights. Cost: free; $3/mo platform fee unless you hold $10,000+ (Oct 2026).

One real limitation: Trading happens in scheduled windows, which suits long-term investing and frustrates anyone wanting control over execution.

Aggregates your accounts and layers AI insights with a tax-aware lens. Best for a consolidated view across holdings.

How it works: Mezzi aggregates your investment accounts into one view and layers AI insights over them with a tax-aware lens, flagging things like potential wash sales, fee drag, and unrealized-gain considerations across accounts. It is read-only: it tells you what it sees and what to consider, and you act at your broker.

In practice, Mezzi’s AI aggregates accounts + tax-aware insights. It is an AI investing app that connects the brokerage you already use, best suited to aggregated wealth tracking with AI. On connecting an account: yes. On execution: read. Cost: subscription.

One real limitation: Focused on tracking and insight; it does not build thesis-driven baskets.

Category comes first. M1 Finance focuses on people who want to choose the holdings but automate the maintenance (automates rebalancing toward weights you set), and Mezzi on aggregated wealth tracking with AI (aggregates accounts + tax-aware insights). On broker connection they differ too: M1 Finance is “No (holds your money at M1)” versus Mezzi at “Yes”. That shapes everything downstream: how personal the answers are, where trades settle, and how much control you keep over individual positions.

Every tool gives something up for what it does well. Below is the give-and-take on each, so you can weigh the specific strengths against the limitations that come with them, beyond the headline category.

For AI investing tools, the distinction that matters most is whether the tool works from your actual, connected positions or reasons from something else: a separate account it manages for you, or the tickers and numbers you feed it. It decides how personal the answers can be, and where your money physically lives.

• M1 Finance: manages a separate account it holds. M1 Finance does not read the brokerage you already use. It opens and holds a new account, then invests the money you move into it, so its view is limited to what sits inside M1 Finance.
• Mezzi: reads your real connected holdings. Mezzi connects your real brokerage (Yes) and works from your actual positions, so its answers reflect what you actually own.

This is where they diverge most. One works from your real, connected account while the other does not, so if you want an assistant grounded in the exact positions you already hold, that gap is the thing to weigh first. This holdings-aware angle is the one Walnut is built around: it connects the brokerage you already use and reasons from your live positions, read-only by default, with any trades left for you to approve.

Each one wins a different job, so the answer depends on which job you need done.

• Choose M1 Finance if you want people who want to choose the holdings but automate the maintenance. Its AI automates rebalancing toward weights you set, and it costs free; $3/mo platform fee unless you hold $10,000+ (Oct 2026). It is built for a self-directed investor with a clear allocation in mind who wants it maintained automatically. Keep in mind: trading happens in scheduled windows, which suits long-term investing and frustrates anyone wanting control over execution.
• Choose Mezzi if you want aggregated wealth tracking with AI. Its AI aggregates accounts + tax-aware insights, and it costs subscription. It is built for multi-account investors who want tax-aware tracking and insights consolidated in one place. Keep in mind: focused on tracking and insight; it does not build thesis-driven baskets.
• Choose Walnut if you want a keep, trim or exit read on the stocks you already own, and placing the trades you approve. It is an AI investing app that connects the broker you already use, and it costs free; Walnut Plus $9.99/mo on the web; no fee on assets.

Because they sit in different categories, this is not strictly either-or: some investors use one for people who want to choose the holdings but automate the maintenance and the other for aggregated wealth tracking with AI, and watch for overlapping costs.

Cost is easy to misread when two tools charge in different shapes, so compare the model, not just the number. M1 Finance: free; $3/mo platform fee unless you hold $10,000+ (Oct 2026). Mezzi: subscription. A percentage-of-assets fee scales with your balance, a flat subscription does not, and a “free” tier usually earns elsewhere (on cash, order flow, or premium upgrades), so the cheapest headline is not always the cheapest outcome for your situation.

Prices checked October 2026. Pricing and tiers change, so confirm the current numbers on each provider’s own site before you decide.

Walnut is an AI investing app, and it is the pick for a keep, trim or exit read on the stocks you already own, and placing the trades you approve (free; Walnut Plus $9.99/mo on the web; no fee on assets). It connects the brokerage you already use, read-only by default, gives each holding a keep, trim or exit read against the S&P 500, flags any position above a quarter of the portfolio, and places the trades you approve. You use it through its own assistant, or inside Claude or ChatGPT. See Walnut vs M1 Finance and Walnut vs Mezzi.