SigFig vs Vanguard Digital Advisor: Which Is Better in 2026?

Figures and features are point-in-time and change; treat the table as a starting map, not a live quote.

An automated investing service that manages accounts held at your existing broker rather than requiring you to move money.

How it works: Rather than opening a new account, you link an existing brokerage account at a supported custodian and SigFig manages it in place, rebalancing and running tax-efficient strategies. Below a stated balance the management is free. This structure is unusual: nearly every competitor requires custody of your assets.

In practice, SigFig’s AI automates a portfolio in accounts you already hold. It falls under hands-off automated investing (robo-advisors), which makes it best suited to automation that manages your existing schwab or fidelity account. On connecting an account it is “Yes, it manages accounts held at supported brokers”, and on execution it is “Automated”. It is priced as free under a stated balance, then a percentage (verify current).

One honest limitation: Supported custodians are limited, so it only works if your account is already at one of them.

Vanguard's automated portfolio service, built from its own index funds at one of the lowest all-in costs in the category. Best for committed indexers.

How it works: A questionnaire sets a target allocation, and Vanguard builds it from a small set of its own index funds inside a Vanguard account, rebalancing automatically. Vanguard quotes the fee net of the underlying fund costs it already earns, which is why the all-in number is among the lowest available and why comparing it to a competitor's headline rate is not apples to apples.

In practice, Vanguard Digital Advisor’s AI automates a vanguard index portfolio. It falls under hands-off automated investing (robo-advisors), which makes it best suited to low-cost automation for people who already believe in index funds. On connecting an account it is “No (holds your money at Vanguard)”, and on execution it is “Automated”. It is priced as low net advisory fee, around 0.15-0.20%/yr all-in (verify current).

One honest limitation: It invests in Vanguard funds only, so it is an allocation service rather than an open comparison of what is best.

The core difference is category. SigFig focuses on automation that manages your existing schwab or fidelity account (automates a portfolio in accounts you already hold), and Vanguard Digital Advisor on low-cost automation for people who already believe in index funds (automates a vanguard index portfolio). On broker connection they differ too: SigFig is “Yes, it manages accounts held at supported brokers” versus Vanguard Digital Advisor at “No (holds your money at Vanguard)”. 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.

• SigFig: manages a separate account it holds. SigFig 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 SigFig.
• Vanguard Digital Advisor: manages a separate account it holds. Vanguard Digital Advisor 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 Vanguard Digital Advisor.

On this specific question the two land on the same side, so the deciding factors between them are elsewhere: category, cost, and who each is built for. 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.

There is no universal winner here; the right pick depends on the job you are hiring the tool for. Match the category to your intent rather than chasing a single “best.”

• Choose SigFig if you want automation that manages your existing schwab or fidelity account. Its AI automates a portfolio in accounts you already hold, it is priced as free under a stated balance, then a percentage (verify current), and it fits hands-off automated investing (robo-advisors). It is built for someone with an existing account at a supported broker who wants it managed without moving anything. Keep in mind that supported custodians are limited, so it only works if your account is already at one of them.
• Choose Vanguard Digital Advisor if you want low-cost automation for people who already believe in index funds. Its AI automates a vanguard index portfolio, it is priced as low net advisory fee, around 0.15-0.20%/yr all-in (verify current), and it fits hands-off automated investing (robo-advisors). It is built for someone who already decided index funds are the answer and wants the cheapest automated way to hold them. Keep in mind that it invests in vanguard funds only, so it is an allocation service rather than an open comparison of what is best.

Because both sit in the same category, the choice comes down to the finer details above rather than a fundamental difference in approach.

Cost is easy to misread when two tools charge in different shapes, so compare the model, not just the number. SigFig is priced as free under a stated balance, then a percentage (verify current), while Vanguard Digital Advisor is priced as low net advisory fee, around 0.15-0.20%/yr all-in (verify current). 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.

Pricing and tiers change often. Confirm the current numbers on each provider’s own site before you decide; the framing above is point-in-time.

If neither quite fits, Walnut sits in a third category: chat-driven management of your own brokerage. It connects the brokerage you already use through SnapTrade, lets you analyze and manage it by talking through Claude or ChatGPT, build thematic portfolios around a thesis, and place trades you approve. Read-only by default. See Walnut vs SigFig and Walnut vs Vanguard Digital Advisor. Walnut is not an investment adviser.