Both are FCA regulated and FSCS protected. The real differences are fees, investment range and how each platform feels to use. Here is the honest comparison.
Fees verified July 2026. Capital at risk. Information, not financial advice.
Cost-conscious DIY investors who want to keep every fee at zero.
Portfolios above roughly £60k where a flat fee beats percentage charges.
| Fee | Trading 212 | Interactive Investor |
|---|---|---|
| Platform fee | £0 | Core £5.99/month (up to £100k); Plus £14.99/month (no limit); Premium £39.99/month |
| Share dealing | £0 commission | £3.99 per trade (£2.99 on Premium) |
| Fund dealing | ETFs only, £0 commission | £3.99 per trade (£2.99 on Premium) |
| FX fee | 0.15% | 1.5% on the first £25k, tiered lower above |
| Stocks & Shares ISA | Free | Included in the monthly plan |
| SIPP | Free | Included in the monthly plan |
| Withdrawals | Free | Free |
| Minimum to start | £1 | No minimum (£25/month for regular investing) |
Reviewers consistently rate the app as easy to use and good value, and many mention the competitive interest paid on uninvested cash.
The most common criticisms are slow identity verification for new accounts and support that can take time to respond.
Read Trading 212 reviews on TrustpilotLong-standing customers value the flat fee and the breadth of investments.
The 1.5% headline FX fee and occasional platform outages are the recurring complaints.
Read Interactive Investor reviews on TrustpilotTrading 212 built its name on removing fees. There is no platform fee, no dealing commission and no account charge on its ISA or SIPP. The only cost most investors pay is a 0.15% currency conversion fee when buying shares priced in dollars or euros.
The trade-off is scope. You can hold shares and ETFs but not traditional funds, and support is app-based. For an investor who wants a global tracker ETF inside an ISA at close to zero cost, it is very hard to beat on price.
Interactive Investor charges a flat monthly subscription instead of a percentage. On a £200,000 portfolio, £5.99 a month is a fraction of what percentage-fee platforms charge, which is why ii keeps winning larger DIY investors.
The equation flips for small pots: £71.88 a year on £10,000 is 0.7%, more than almost any rival. Work out your portfolio size first, then decide.
A 0.2% fee difference is worth optimising. Knowing whether you are saving enough in the first place is worth far more. Delphina models your pensions, ISAs and investments and tells you where you actually stand.