Both are FCA-regulated and FSCS-protected. The real difference is fees, account types and how each platform feels to use. Verified against each provider’s published charges.
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.
Tick what you need. No account, no email. The answer is on this page.
Tick what you need above and we'll tell you which of the two covers it.
Account availability verified July 2026. Capital at risk. Information, not financial advice.
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 Trustpilot| 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 confirmed: check IG's site for fund availability | Free |
| FX fee | 0.7% | None on GBP fund classes |
| Stocks & Shares ISA | Free | Free |
| SIPP | Commission-free; administered by Options Pensions, £205 a year | Free |
| Withdrawals | Free | Free |
| Minimum to start | No minimum | No minimum |
A 0.25% yearly fee gap sounds small. On £50,000 over 20 years it is about £5,900 (illustrative). Add your ISA and pension balances to Delphina yourself and see what your charges cost by retirement and whether you're on track.
See what my fees costIllustrative: £50,000, 5% a year growth before charges, 0.25% vs 0.50% a year in charges, no further contributions. Not a recommendation of IG or Prosper. Delphina is guidance, not financial advice.
IG 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 really can 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.
It depends on what you hold and how often you trade. IG's platform fee is £0 (custody fee removed January 2026), against £0 at Prosper. On dealing, IG charges £0 commission with instant currency conversion for shares and not confirmed: check IG's site for fund availability for funds, while Prosper charges not applicable (funds and ETFs) for shares and free for funds. Fees verified July 2026.
IG is best for active investors who want professional tools alongside long-term holdings. Prosper is best for index fund investors who want the lowest possible total cost and are comfortable with a newer app. Both are FCA regulated and covered by the FSCS.
On IG's ISA: Free. On Prosper's ISA: Free. Both offer a flexible ISA, so you can withdraw and replace money in the same tax year without using up allowance. Minimums are No minimum at IG and No minimum at Prosper.
IG offers a SIPP (commission-free; administered by Options Pensions, £205 a year). Prosper offers a SIPP (free).
IG scores 3.8 out of 5 on Trustpilot (Great) from around 8,500 reviews. Prosper scores 4.6 out of 5 (Excellent) from around 300 reviews. Lower scores than rivals, with complaints about account queries and the complexity of the product range. The review base is small and some users want more account types and a web version.
Yes. UK platforms accept ISA and SIPP transfers in, and you start the transfer with the receiving provider rather than the one you are leaving. IG charges free on withdrawals and Prosper charges free. Transfer as cash and you are out of the market while it settles; transfer in specie and you keep your holdings but it takes longer.
IG or Prosper, the account is the easy part. What decides when you can retire is how much goes in and for how long. Delphina works that out from what you already hold and what you pay in each month.
Free to check. No card required. Takes about two minutes.