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.
Active investors who want professional tools alongside long-term holdings.
Index fund investors who want the lowest possible total cost and are comfortable with a newer app.
| Fee | IG | Prosper |
|---|---|---|
| Platform fee | £0 (custody fee removed January 2026) | £0 |
| Share dealing | £0 commission with instant currency conversion | Not applicable (funds and ETFs) |
| Fund dealing | Not available (shares and ETFs only) | Free |
| FX fee | 0.7% | None on GBP fund classes |
| Stocks & Shares ISA | Free | Free |
| SIPP | Available, third-party administration fees apply | Free |
| Withdrawals | Free | Free |
| Minimum to start | No minimum | No minimum |
Experienced traders rate the platform quality, charting and market access.
Lower scores than rivals, with complaints about account queries and the complexity of the product range.
Read IG reviews on TrustpilotEarly adopters praise the zero fees and responsive founding team; roughly 84% of reviews are five stars.
The review base is small and some users want more account types and a web version.
Read Prosper reviews on TrustpilotIG is best known for trading, but its share dealing account and ISA became far more competitive in 2026 when it removed custody fees and commissions. You get institutional-quality tools with no platform charge.
The 0.7% currency conversion fee is the main cost to watch on US shares, and there are no traditional funds. It suits confident investors; beginners will find simpler homes elsewhere.
Prosper's pitch is the cheapest total cost of ownership in the UK: no platform fee, no dealing fees, and refunded fund fees on a list of mainstream index funds. For a straightforward global tracker in an ISA or SIPP, the all-in cost can genuinely be zero.
The counterweight is maturity. It is a young platform with a small (if very positive) review base and no individual shares. If that trade-off suits you, the price is unbeatable.
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.