Why you can trust our investment platforms reviews
We surveyed 4,136 people who invest with ‘do-it-yourself’ investment platforms, asking them to score their provider.
To be named a Which? Recommended Provider, a platform can’t be in the 25% most expensive platforms for a particular size of investment.
Please note: the content contained in this article is for information purposes only and does not constitute financial or investment advice.
Best investment platforms for stocks and shares Isas – our ranking
Table note: The results are based on an online survey of 3,697 adults – members of the Which? Connect panel and members of the public – conducted in January 2025. The customer score is based on satisfaction with the brand and likelihood to recommend. Sample size of each brand/product is in brackets, ‘n/a’ means not enough responses to include a star rating. Each platform must have at least 30 responses to receive a customer score. See below for how we pick Which? Recommended Providers.
Which? Recommended Providers
AJ Bell
Which? Recommended Provider for stocks and shares Isas.
In our latest customer satisfaction survey, AJ Bell received a customer score of 78% for its stocks and shares Isa, putting it joint 2nd out of 25 providers.
We like: AJ Bell has the widest range of assets available to invest in of any of the platforms covered in our survey – at more than 24,200, including at least 4,480 mutual funds.
We don’t like: AJ Bell is one of few platforms that charges a fee to buy and sell funds, although the charge is low at £1.50.
Find out more about AJ Bell on its website.
InvestEngine
Which? Recommended Provider for stocks and shares Isas.
In our latest customer satisfaction survey, InvestEngine received a customer score of 78% for its stocks and shares Isa, putting it joint 2nd out of 25 providers.
We like: InvestEngine is both a Which? Recommended Provider for 2025-26 and rated Great Value by Which?.
We don’t like: It only offers ETFs, which will deter investors wanting to opt for individual shares or bonds.
Find out more about InvestEngine on its website.
Great Value Isas
As well as Which? Recommended Providers, we also endorse the stocks and shares Isas that offer great value for money. These don’t have to achieve the very highest scores in our survey, but they must receive good customer scores and come out cheapest in our analysis of fees.
To be eligible for our Great Value recommendation, platforms must be in our top three customer score bands and among the 25% least expensive in the asset categories they offer (any combination of funds, shares, or ETFs).
This year, InvestEngine, iWeb, NatWest, Royal Bank Invest from the Royal Bank of Scotland, and Vanguard are all Great Value.
What type of investor are you?
Megan Thomas, Which? investments writer, says:
‘Some of the features we look into in our reviews aren’t a matter of better or worse, but of preference. Take the number of investments available on a platform – they range from three to nearly 25,000. One investor’s freedom is another’s mental overload.
‘Before you pick an investment platform, it’s important to ask yourself some questions. Are you new to investing and need help to work out what different jargon means? Or are you looking for the most tools and assets available to make the most of your own expert knowledge?
‘While our reviews can tell you what customers thought of the platforms they use and what features they offer, only you know which of those features will suit you best.’
More on investment platforms
How we analyse investment platforms
Customer scores
In January 2025, we surveyed 3,697 investors and analysed their responses to give customer scores for 25 do-it-yourself investment platforms providing stocks and shares Isas. Each platform must have at least 30 responses to receive a customer score.
We ask investors to rate their current platform for the quality of its customer communications, overall customer service, ease of use and information on investments. We also ask whether it meets their needs, represents value for money and whether they would recommend it to someone else.
We don’t analyse the performance of investments listed by investment platforms, as different investors will opt for different investments.
Which? Recommended Provider criteria
To be considered to be a Which? Recommended Provider (WRP) for stocks and shares Isas, the platform needs to have a customer score of 70% or higher.
Companies that reach this score can then be excluded if they’re in the top 25% most expensive platforms for across our scenarios, based on our fees analysis. Platforms will also not be eligible for WRP status if they receive a two-star rating or lower in any of our individual categories.
On top of these criteria, we apply statistical tests that place the platforms into ‘bands’, and only the platforms in the highest band – the ones that really stand out against the rest – can be a WRP.
- Find out more: Compare investment platform fees and charges
What’s the best investment platform?
Choosing the right investment platform could save you money and give you the information and tools you need to choose better investments.
We’ve surveyed thousands of investment platform customers, and analysed fees, to rank the biggest platforms and pick our Which? Recommended Providers for stocks and shares Isas.