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Every platform here offers a Stocks & Shares ISA, so the wrapper isn't the differentiator — the charges inside it are. On a £20,000 allowance the gap between a free platform and a 0.45% one is meaningful before you've picked a single holding.
The other split is structural: percentage fees are cheaper on small pots and punishing on large ones, flat monthly fees are the reverse. Where the lines cross depends on your balance, which is why the cost model further down lets you set the pot size.
No platform fee, no dealing commission and low currency conversion — the strongest all-round ISA for most people.
Platform fee Free · UK dealing Free · FX 0.15%
Equally free to hold, with a SIPP alongside it. Costlier on currency conversion if you buy US shares.
Platform fee Free · UK dealing Free · FX 0.99%
ETF-only, with no platform fee on a DIY portfolio. Pick if a passive portfolio is the whole plan.
Platform fee — · UK dealing Free · FX 0%
Low-cost global shares with interest paid on cash you haven't invested yet. No SIPP.
Platform fee Free · UK dealing Free · FX 0.1%
A percentage charge, but funds, investment trusts and a LISA on one established platform.
Platform fee 0.25% · UK dealing £5 · FX 0.75%
A flat monthly fee rather than a percentage — the arithmetic turns in its favour once the pot is large.
Platform fee £5.99/mo · UK dealing £3.99 · FX 0.75%
No platform fee and commission-free dealing, with a narrower range of accounts.
Platform fee Free · UK dealing Free · FX 0.5%