SigFig Review (2026): Cost, Features, and Who It Suits
Last updated August 2026
Short answer
An automated investing service that manages accounts held at your existing broker rather than requiring you to move money. On cost, it is free under a stated balance, then a percentage (verify current), and on the question that decides most of the day-to-day experience, whether it works with the brokerage account you already have, the answer is: Yes, it manages accounts held at supported brokers. It suits someone with an existing account at a supported broker who wants it managed without moving anything. Where it falls short: Supported custodians are limited, so it only works if your account is already at one of them. This review is published by Walnut, which competes with SigFig, and is written from public information rather than collected user ratings.
What SigFig is and 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 category terms it is hands-off automated investing (robo-advisors), and the AI component specifically automates a portfolio in accounts you already hold. That phrase is worth reading literally: across this market, "AI" covers everything from a rebalancing rule to a conversational assistant, and the products are not interchangeable just because they share the label.
What SigFig does well
- Manages the account you already have rather than requiring a transfer
- Free below a stated balance
- Avoids the tax consequences of liquidating to move to a new provider
These are real advantages, and if they describe what you want, SigFig is a reasonable choice regardless of what any competitor including us has to say about it.
Where SigFig falls short
Supported custodians are limited, so it only works if your account is already at one of them.
- Only works with a short list of supported custodians
- Smaller and less prominent than the large robo-advisors, so check the current state of the service
What SigFig costs
Free under a stated balance, then a percentage (verify current). Because it is not charged as a percentage of assets, the cost does not scale with your balance. That makes it proportionally cheaper as an account grows and relatively expensive on a small one, which is the opposite of how a robo-advisor fee behaves.
Fees change. The figure above is a guide rather than a quote, and the SigFig pricing breakdown goes into what else you pay on top. Confirm current pricing on SigFig's own site.
How SigFig compares with the alternatives
| Product | Cost | Connects your broker? | Best for |
|---|---|---|---|
| SigFig | Free under a stated balance, then a percentage (verify current) | Yes, it manages accounts held at supported brokers | Automation that manages your existing Schwab or Fidelity account |
| Betterment | ~0.25%/yr | No (holds your money) | Set-and-forget automated investing |
| Wealthfront | ~0.25%/yr | No (holds your money) | Hands-off investing with planning built in |
| SoFi | Free automated investing | No (holds your money) | Beginners in one money app |
| Schwab Intelligent Portfolios | No advisory fee; ETF expenses apply (verify current) | No (holds your money at Schwab) | Hands-off investing with no advisory fee, if you accept the cash allocation |
Within hands-off automated investing (robo-advisors), the products differ less on capability than the marketing suggests. Cost and whether your money has to move are the two variables that actually change your experience.
Where Walnut fits, and where it does not
To be upfront, since this is our site: the one factual difference worth knowing is that SigFig and Walnut both work with an account you already hold, so the difference is what happens next: Walnut answers questions about your real positions through Claude or ChatGPT rather than inside its own app. Walnut is free, with no paid plan and no fee on assets.
Where Walnut is the wrong choice: it will not manage money for you, it is not a registered investment adviser, it does no tax or estate planning, and it needs a brokerage account you already hold. If what you want is delegation rather than analysis, a robo-advisor or a human planner is the better answer and SigFig may well be it. The full self-assessment is on the Walnut review.
The bottom line on SigFig
SigFig: An automated investing service that manages accounts held at your existing broker rather than requiring you to move money, at free under a stated balance, then a percentage (verify current). It fits someone with an existing account at a supported broker who wants it managed without moving anything. The trade-off to accept: Supported custodians are limited, so it only works if your account is already at one of them. If that trade-off is one you are happy with, it is a sound choice.
FAQ
What is SigFig?
An automated investing service that manages accounts held at your existing broker rather than requiring you to move money. It sits in the hands-off automated investing (robo-advisors) category, costs free under a stated balance, then a percentage (verify current), and is best suited to automation that manages your existing Schwab or Fidelity account.
How much does SigFig cost?
Free under a stated balance, then a percentage (verify current). Because that is not a percentage of assets, the cost does not scale with your balance the way a robo-advisor fee does, which makes it cheaper proportionally as the account grows and more expensive on a small one. Verify current pricing on SigFig's own site.
Does SigFig connect to my existing brokerage account?
Yes, it manages accounts held at supported brokers. This is the distinction that decides most of the practical experience: a product that holds your money manages it inside its own account, while one that connects to your broker leaves your assets where they are. Neither is better in the abstract, but moving money has tax consequences in a taxable account that connecting does not.
What does the AI in SigFig actually do?
Automates a portfolio in accounts you already hold. That is worth reading literally rather than as marketing, because "AI" spans everything from an automated rebalancing rule to a conversational assistant that reads your holdings. What matters is whether it does the specific job you want done.
What is the biggest drawback of SigFig?
Supported custodians are limited, so it only works if your account is already at one of them. Beyond that: only works with a short list of supported custodians.
Who is SigFig best for?
It fits someone with an existing account at a supported broker who wants it managed without moving anything. If that does not describe you, the mismatch will show up quickly, because SigFig is built around that use case rather than trying to serve everyone.
SigFig vs Betterment: which is better?
They compete in the same category, so the deciding factors are cost and model rather than capability. SigFig costs Free under a stated balance, then a percentage (verify current) and works with an account you already have; Betterment costs ~0.25%/yr. Betterment leads on set-and-forget automated investing. Compare those before assuming they are interchangeable.
Is this an independent review of SigFig?
No. Walnut publishes it and competes with SigFig, so treat it as an informed assessment rather than a neutral one. It is built from public information about the product and carries no star rating, because we have not surveyed SigFig's customers. The strengths listed above are genuine, and the section on where Walnut fits is limited to one factual difference rather than a pitch.
Walnut publishes this page and competes with SigFig, so read it as an informed assessment rather than an independent one. It is built from publicly available information about the product, not from collected user reviews, and it carries no star rating because we have not surveyed SigFig's customers. Pricing, features and availability change; verify current details on SigFig's own site before deciding. Walnut is informational and is not an investment adviser. Nothing here is a recommendation to buy, sell, or hold any security or to use any particular product.