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Broker Comparison

interactive investor vs SigFig

Compare interactive investor and SigFig side by side: fees, regulation, platforms.

interactive investor

interactive investor

Flat-fee long-term investors

interactive investor is a UK flat-fee investment platform for shares, funds, ETFs, bonds, ISAs and SIPPs, wit…

VS
SigFig

SigFig

Low-cost automated portfolio investors

SigFig is a US robo-advisor offering automated ETF portfolios, tax-loss harvesting, and free human advisor ac…

Head-to-head comparison

interactive investor vs SigFig
Feature interactive investor SigFig
Minimum deposit - -
Stock trading fee UK & US Shares (incl. ETFs & Investment trusts): £3.99 on Core and Plus; £2.99 on Premium -
Regulators FCA SEC
Best for Flat-fee long-term investors Low-cost automated portfolio investors
Markets & account
Stocks
-
ETFs
Bonds
Funds
Investment Plans
-
Ready Made Portfolios
Multi Currency
-
Business Account
-
Isa
-
Sipp
-
Fractional Shares
-

Pros & cons

interactive investor

interactive investor

Pros

  • Flat monthly plans start at £5.99 instead of a percentage fee
  • Free regular investing across all plans
  • Next-day GBP and EUR withdrawals have no charge
  • Plus includes 1 free monthly trade; Premium includes 2
  • Premium makes fund trades and dividend reinvestments free
  • Trading Account can hold up to 9 currencies
  • Plus includes 5 free family accounts; Premium includes unlimited
  • Transfers in and out have no ii charge

Cons

  • Core portfolios are limited to £100,000 before Plus applies
  • Core FX conversion fee is 0.75%
  • Other international shares cost £9.99 on Core
  • Same-day GBP and EUR withdrawals cost £15
  • Telephone trades cost £49
  • Junior ISAs are unavailable on the Core plan
  • Premium costs £39.99 per month
  • Company Account applications must be posted
SigFig

SigFig

Pros

  • No advisory fee on first $10,000 managed
  • 0.25% annual fee is in line with leading robo-advisors
  • Free access to human investment advisors
  • Automatic rebalancing included
  • Tax-loss harvesting included
  • Low underlying ETF expense ratios (0.07%-0.15%)
  • No deposit, withdrawal, or rebalancing fees
  • Assets held at established custodians (Schwab, Fidelity) with SIPC protection

Cons

  • $2,000 minimum is higher than some competitors (Betterment has no minimum, Wealthfront starts at $500)
  • No cash management or savings account
  • No demo account to test the platform before investing
  • Fractional shares only available through dividend reinvestment, not initial purchases
  • Limited portfolio customization - model portfolios focused on ETFs and funds
  • No crypto investing
  • Company announced rebrand to Tandems in September 2025; long-term consumer product direction is uncertain
interactive investor

interactive investor

interactive investor is a UK flat-fee investment platform for shares, funds, ETFs, bonds, ISAs and SIPPs, with managed portfolios and multi-currency investing.

Visit interactive investor Read review

Your capital is at risk. Other fees apply.

SigFig

SigFig

SigFig is a US robo-advisor offering automated ETF portfolios, tax-loss harvesting, and free human advisor access, with no fee on the first $10,000 managed.

Visit SigFig Read review

Your capital is at risk. Other fees apply.

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