Betterment 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.

Automated, diversified ETF portfolios with goal planning, rebalancing and tax-loss harvesting. The automation runs on rules rather than a conversational AI that reads your holdings. Best for people who want it fully hands-off.

How it works: You answer a short set of questions about your goals, timeline, and risk tolerance, then move money into a Betterment account. From there Betterment builds a diversified portfolio of low-cost ETFs and manages it for you, automatically rebalancing and, on taxable accounts, running tax-loss harvesting in the background. You do not choose individual stocks.

In practice, Betterment’s AI automates a diversified portfolio. It is a robo-advisor (hands-off automated investing), best suited to set-and-forget automated investing. On connecting an account: no (holds your money). On execution: automated. Cost: $5/mo, or 0.25%/yr from $24,000 or $200/mo deposits (Oct 2026).

One honest limitation: You do not pick holdings, and it manages money inside Betterment, not your existing broker.

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 honest limitation: Tracking-and-insight focused rather than thesis-driven basket building.

The core difference is category. Betterment focuses on set-and-forget automated investing (automates a diversified portfolio), and Mezzi on aggregated wealth tracking with AI (aggregates accounts + tax-aware insights). On broker connection they differ too: Betterment is “No (holds your money)” 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. Here is the honest give-and-take on each, so you can weigh the specific strengths against the limitations that come with them rather than judging on the headline category alone.

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.

• Betterment: manages a separate account it holds. Betterment 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 Betterment.
• Mezzi: reads your real connected holdings. Mezzi connects your real brokerage (Yes) and works from your actual positions, so its answers reflect what you genuinely own rather than a generic model.

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 is committed per job rather than overall.

• Choose Betterment if you want set-and-forget automated investing. Its AI automates a diversified portfolio, and it costs $5/mo, or 0.25%/yr from $24,000 or $200/mo deposits (Oct 2026). It is built for someone who wants a genuinely hands-off, diversified portfolio and has no interest in picking stocks themselves. Keep in mind: you do not pick holdings, and it manages money inside Betterment, not your existing broker.
• 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: tracking-and-insight focused rather than thesis-driven basket building.
• 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 Unlimited $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 set-and-forget automated investing 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. Betterment: $5/mo, or 0.25%/yr from $24,000 or $200/mo deposits (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 Unlimited $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 Betterment and Walnut vs Mezzi.