Updated September 28, 2026 · BrokerCue Editorial Team
Ally Bank vs One (One Finance)
What sets them apart
| Compare |  Ally Bank |  One (One Finance) |
|---|---|---|
| Minimum investment | $100 | $1Lower |
| Regulators | SEC, FINRA, FDIC | FINRA, SIPC, NMLS |
| Account types | Joint, IRA, Roth IRACovers more | IRA, Roth IRA |
| Portfolio types | ETF, ESG, Cash | ETF, Crypto |
| Management fee | 0% to 0.3% | Not confirmed |
Same on both: Investor protection (SIPC up to USD 500,000).
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Key differences
- Regulators: only Ally Bank offers SEC, FDIC.
- Regulators: only One (One Finance) offers SIPC, NMLS.
- Minimum investment is lower at One (One Finance): $1 vs $100.
- Account types: only Ally Bank offers Joint.
- Portfolio types: only Ally Bank offers ESG, Cash.
- Portfolio types: only One (One Finance) offers Crypto.
- Support channels: only Ally Bank offers Email.
Our verdict on each
Ally Bank
Ally Bank suits US investors who want commission-free share dealing with a free account and a free inactivity charge, and it heads the cost table on the measures compared. The trade-off sits in the automated portfolios, which take a management fee of 0% to 0.3% and a starting investment of $100.
One (One Finance)
One Finance offers a US robo portfolio of ETFs and crypto, wrapped in ira and roth ira accounts and backed by SIPC up to USD 500,000. It suits US savers who want automated retirement investing, a small starting amount and help by phone, chat or a help centre.
Score breakdown
| Area | Ally Bank | One (One Finance) |
|---|---|---|
| Cost | 9.4$0 to trade shares, $0 account fee, $0 inactivity charge, with $0.50 per options contract and 0% to 0.3% on automated portfolios. | 9.6HigherEntry amount of $1 sits well under €560.82, the level that three quarters of robo advisors fall below. |
| Offer | 9.6Higher | 9.1 |
| Trust | 9.8 | 9.9Higher |
Positions in our rankings
| Ranking | Ally Bank | One (One Finance) |
|---|---|---|
| Robo-advisors | 8 of 153 | 11 of 153 |
Also worth a look
Empower Personal Dashboard has minimum investment at $0, against $100 for Ally Bank and $1 for One (One Finance).
Empower Personal Dashboard reviewEvery fact side by side
| Fact | Ally Bank | One (One Finance) |
|---|---|---|
| Legal entity | Ally Bank | One Finance, Inc. |
| Headquarters | United States | United States |
| Founded | 1919 | Not confirmed |
| Support channels | Email, Chat, Phone, Help centreCovers more | Phone, Chat, Help centre |
Where each stands against the rest
| Fact | Ally Bank | One (One Finance) | Median |
|---|---|---|---|
| Management fee | 0% to 0.3%lowest quarter | Not confirmed | 0.35 |
| Minimum investment | $100at the median | $1below the median | $100 |
Median across 67 listed brokers.
Pros and cons
Ally Bank
Pros
- A stock trade costs $0 and the account fee is $0, so holding a US portfolio costs nothing at the platform level.
- The inactivity fee is $0, and Ally ranks 1 on that measure among 56, so a dormant balance is not quietly drained.
- Regulated in the US by SEC, FINRA and FDIC, with investor protection recorded as SIPC up to USD 500,000 and an FDIC certificate of FDIC cert 57803.
Cons
- The automated portfolios take a management fee of 0% to 0.3% a year, so a free account is not the whole cost picture.
- Options carry $0.50 per contract, so the commission-free model in commission free does not reach derivative trading.
- Account types run to joint, ira and roth ira, with no wrapper for a tax-sheltered investor who is not saving through a retirement account.
One (One Finance)
Pros
- Retirement account choice of ira and roth ira for long-term savers.
- Registered with FINRA, SIPC and NMLS and backed by SIPC up to USD 500,000.
- Help on phone, chat and help centre, so a phone call is possible as well as chat.
Cons
- Built for the US market, with the entity based in the United States and accounts limited to ira and roth ira.
- Crypto sits in etf and crypto, which can add sharp swings to a portfolio.
- Across the brands compared here, 70.15% of retail money was lost, so losses should be expected.
Who each suits
Ally Bank
Who it suits
- US savers who want commission-free share dealing, a minimum deposit of $0 and an account fee of $0.
- Retirement investors, since joint, ira and roth ira covers individual retirement accounts and joint accounts.
- People who would rather ring than email, since email, chat and phone includes phone, chat, email and a help centre.
Who should look elsewhere
- Traders after forex, contracts for difference or crypto, since stocks, etfs and options stops at the US list while stocks, etfs and forex goes further.
- Anyone who wants leveraged index exposure on the same account, where CFI covers stocks, etfs and forex and Ally does not.
One (One Finance)
Who it suits
- US savers building a retirement pot rather than trading frequently.
- People happy with an automated etf and crypto portfolio decided for them.
- Anyone who values phone, chat and help centre when they need help.
Who should look elsewhere
- UK and European investors, since Vivid Standard is set up in euro at €2.
- People starting with a much larger sum, who can compare Axos Invest and its $100 entry point.
Country by country
| Country | Ally Bank | One (One Finance) |
|---|---|---|
| United States | Yes | Yes |
Questions about each
Ally Bank
What does it cost to open a self-directed account and place a trade?+
Opening costs nothing beyond the deposit itself, and the minimum deposit is $0. Trading shares carries a fee of $0 and the account fee is $0, so a small starter order does not eat into the position. Options are the exception and are priced separately per contract.
Is there a charge if I leave the account empty?+
No. The inactivity fee is $0, which means an account you stop using carries no monthly drain on the balance. It matters most for anyone splitting cash between trading and holding, because a dormant account here does not quietly shave the value of what sits in it while a decision is pending.
One (One Finance)
What is the minimum investment at One?+
You can start from $1. That sits well under €560.82, the point that three quarters of the robo advisors compared here fall below. For anyone building a portfolio in stages, the entry amount is unlikely to be the obstacle.
Which accounts can I open?+
One offers ira and roth ira accounts. That is a retirement focus rather than a spread of general investment accounts, so the service is built around long-term saving in a US wrapper. If you want a taxable general account, this is not the range to look at.
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