Robo-advisors promise to remove the hardest part of investing: deciding what to buy. You answer a risk questionnaire, the algorithm builds a diversified portfolio, and it rebalances automatically while you get on with your life. For a generation priced out of traditional financial advice (minimum investment with a human adviser: typically £50,000–£100,000), robo-advisors democratised professionally structured portfolios. But not all robo-advisors are equal — the fee difference between the cheapest and most expensive can quietly cost you tens of thousands over two decades. This guide compares the six leading UK platforms, breaks down the real cost of investing, and tells you exactly when robo beats DIY and when it doesn't.
Provider Comparison: Six UK Robo-Advisors
Fees quoted are 2025/26 rates. "Total cost" = platform fee + typical underlying fund OCF. Always verify on current provider sites before investing.
| Provider | Platform fee | Min. investment | ISA | SIPP | GIA | Investment approach | App quality | Ethical option |
|---|---|---|---|---|---|---|---|---|
| Nutmeg | 0.45–0.75% (managed); 0.25% (fixed allocation) | £500 | Yes | Yes | Yes | Managed ETF portfolios, 10 risk levels | Excellent | Yes — Socially Responsible portfolios |
| Wealthify | 0.60% | £1 | Yes | No | Yes | Managed multi-asset portfolios, 5 risk levels | Very good; beginner-friendly | Yes — Ethical plans |
| Moneyfarm | 0.35–0.75% (tiered by pot size) | £500 | Yes | Yes | Yes | Managed ETF portfolios; human adviser access | Good; data-rich | Yes — ESG portfolios |
| InvestEngine | 0% (DIY ETF); 0.25% (managed) | £0 DIY / £100 managed | Yes | Yes | Yes | ETF-only; DIY or managed portfolio | Clean; improving fast | Limited (via ESG ETF selection) |
| Vanguard LifeStrategy | 0.15% (capped £375/yr) | £500 / £100/mo | Yes | Yes | Yes | Single-fund multi-asset (80/20, 60/40 etc.) | Clean; simple | Limited (ESG LifeStrategy available) |
| Moneybox | £1/mo + 0.45% platform fee | No minimum | Yes | Yes | No | Managed multi-asset; round-up investing | Excellent; savings-app focus | Yes — Sustainable investing option |
Note on Vanguard LifeStrategy: Strictly speaking, Vanguard's LifeStrategy funds are not a robo-advisor service — they are single-fund solutions where you pick the equity/bond mix (20%, 40%, 60%, 80%, or 100% equity) and hold one fund forever. Included here because they perform the same function for many investors: automatic diversification and rebalancing without active management decisions.
How Robo-Advisors Work
The mechanics behind every mainstream UK robo-advisor follow the same three-step model.
1. Risk profiling
You complete a questionnaire — typically 8–15 questions covering investment horizon, financial goals, reaction to portfolio drops, existing assets, and income. The algorithm scores your responses and assigns you a risk level (usually on a scale of 1–10, or labelled Cautious / Balanced / Adventurous). This score determines your portfolio's asset allocation: the percentage split between global equities, bonds, property, and cash-equivalent instruments.
A risk level 3 (cautious) might be 30% equities / 60% bonds / 10% other. A risk level 8 (adventurous) might be 90% equities / 5% bonds / 5% property. The same underlying ETFs appear across risk levels — the weighting changes, not the building blocks.
2. Automatic portfolio construction
The platform assembles a portfolio of exchange-traded funds (ETFs) matching your target allocation. ETFs are chosen for low cost, broad market coverage, and liquidity. Most platforms use a mix of global equity ETFs (tracking MSCI World or FTSE All-World), bond ETFs (global government or corporate), and sometimes property or commodity ETFs for diversification.
Your money buys fractional shares across all the ETFs in your portfolio simultaneously. A £1,000 investment at risk level 6 might buy £600 of a global equity ETF, £300 of a bond ETF, and £100 of a property ETF in a single transaction — no manual allocation required.
3. Automatic rebalancing
Markets move. If global equities outperform bonds over six months, your portfolio drifts from 70/30 to 78/22. Robo-advisors monitor this drift and rebalance automatically — selling the overperformer, buying the underperformer — to return to your target allocation. This is "buy low, sell high" built into the system by default.
Rebalancing frequency varies by platform: Nutmeg rebalances continuously; Moneyfarm quarterly; Wealthify as needed when drift exceeds a threshold. More frequent rebalancing is not always better — it can trigger CGT events in GIA accounts. ISA and SIPP wrappers eliminate the tax concern.
Robo-Advisor vs DIY Investing: When Each Makes Sense
This is the most important question in this guide. Robo-advisors cost more than DIY. The question is whether that cost is justified.
When robo-advisors win
- You're new to investing and the complexity of selecting funds, managing allocation, and rebalancing would otherwise stop you starting at all. The best investment is the one you actually make. Wealthify's £1 minimum exists for exactly this reason.
- You don't want to spend time on it. Managing a DIY portfolio well takes 2–4 hours per year minimum. Robo-advisors take zero ongoing time. For professionals with high hourly value, the time saving is worth more than the fee difference.
- Your pot is small (<£20,000). At £10,000, the extra annual cost of a robo-advisor versus Vanguard DIY might be £30–60. The diversification and behavioural guardrails (no panic selling) are worth £30 per year for most people.
- You'd otherwise make behavioural mistakes. The biggest cost in investing is not fees — it's buying high and selling low during a crash. Robo-advisors remove the urge to react to market noise. Many investors save more via avoided mistakes than they pay in fees.
When DIY investing wins
- Your pot is large (>£50,000). At £50,000, a 0.5% fee difference is £250/year. At £200,000, it's £1,000/year — and that £1,000 compounds. Over 20 years, the fee gap dwarfs the cost of learning to invest yourself.
- You understand what you're buying. If you know what a global equity ETF is, understand the equity/bond allocation logic, and can execute a simple portfolio rebalance once a year, DIY via Vanguard or InvestEngine DIY is objectively better value.
- You want full control over ethical screening. Robo ESG portfolios use broad ESG ETFs with inconsistent screening criteria. A DIY portfolio lets you choose specifically screened funds and exclude exactly the sectors you object to.
- You have specific tax planning needs. DIY platforms give full visibility into individual fund holdings, enabling precise tax-loss harvesting and capital gains management that robo-advisors can't match.
| Factor | Robo-advisor | DIY investing |
|---|---|---|
| Upfront effort | Low — questionnaire only | Medium — must choose funds |
| Ongoing effort | Zero | Low (1–2 hrs/year) |
| Fees | Higher (0.3–0.75% platform) | Lower (0–0.15% platform) |
| Best pot size | <£20,000 | >£30,000 |
| Behavioural protection | High (automated, removes emotion) | Low (manual decisions) |
| Ethical control | Limited (preset ESG options) | Full (choose your screens) |
| Tax planning | Limited | Full control |
Fee Breakdown: What You Actually Pay
Robo-advisor fees have two layers: the platform fee and the underlying fund fees (OCF/TER). Both compound against your returns every year.
Worked example: £10,000 portfolio over 10 years
Assumption: 7% annual gross return before fees.
| Platform | Platform fee | Typical fund OCF | Total annual cost | 10-year pot value | Cost vs. lowest |
|---|---|---|---|---|---|
| InvestEngine (DIY) | 0% | 0.10–0.15% | ~0.12% | ~£19,430 | — |
| Vanguard LifeStrategy | 0.15% | 0.22% | 0.37% | ~£19,060 | ~£370 |
| Moneyfarm | 0.75% (under £10k) | 0.20% | 0.95% | ~£18,190 | ~£1,240 |
| Nutmeg (managed) | 0.75% | 0.20% | 0.95% | ~£18,190 | ~£1,240 |
| Wealthify | 0.60% | 0.22% | 0.82% | ~£18,370 | ~£1,060 |
Worked example: £50,000 portfolio over 10 years
| Platform | Total annual cost | 10-year pot value | Cost vs. lowest |
|---|---|---|---|
| InvestEngine (DIY) | ~0.12% | ~£97,160 | — |
| Vanguard LifeStrategy | 0.37% | ~£95,290 | ~£1,870 |
| Moneyfarm (0.55% tier) | 0.75% | ~£92,460 | ~£4,700 |
| Nutmeg (fixed allocation) | 0.45% | ~£94,340 | ~£2,820 |
| Wealthify | 0.82% | ~£91,840 | ~£5,320 |
Projections use compound growth calculation at 7% gross annual return minus stated annual costs. Not a guaranteed return. For illustration only.
The takeaway: Fee differences that look small in percentage terms compound into thousands over a decade. On £50,000, the gap between InvestEngine DIY and Wealthify is £5,320 over 10 years — and that gap widens sharply if the pot grows. Moneyfarm's fee tiers mean larger pots (over £20,000) pay 0.55% rather than 0.75%, which materially changes the comparison.
Best-for-Use-Case Picks
Best for beginners: Wealthify
Wealthify's £1 minimum investment is the lowest barrier to entry of any mainstream UK robo-advisor. The interface is genuinely beginner-friendly — five plain-English risk levels (Cautious, Tentative, Confident, Ambitious, Adventurous), clear projected ranges, and no jargon. The 0.60% platform fee is not the cheapest, but for a first investment account where removing friction is the priority, Wealthify gets more people invested than any alternative. Parent company Aviva adds credibility for nervous first-timers. Once your pot exceeds £20,000–30,000, consider migrating to a lower-fee platform.
Start investing with Wealthify.
Best for low fees: InvestEngine
InvestEngine's DIY ETF portfolios have zero platform fee — you pay only the underlying ETF OCFs (typically 0.07–0.15% for broad market trackers). For investors who know what they want to hold, this is the cheapest robo-adjacent option in the UK market. The managed portfolio service charges 0.25%, which is still lower than all fully-managed competitors. The platform is newer and less polished than Nutmeg or Moneyfarm, but for cost-focused investors willing to do a small amount of homework, InvestEngine is hard to beat on value.
Open a zero-fee account with InvestEngine.
Best for ethical investing: Nutmeg Socially Responsible
Nutmeg's Socially Responsible portfolios use ETFs screened for environmental, social, and governance (ESG) criteria. The portfolios exclude companies in tobacco, controversial weapons, and thermal coal, and tilt toward companies with higher ESG ratings. Nutmeg is transparent about the ETF holdings within each portfolio — you can verify the screening methodology rather than taking marketing claims at face value. The 0.75% managed portfolio fee is at the higher end, but the ethical option is not priced at a premium over the standard portfolio. For investors who want a managed ESG solution without DIY complexity, Nutmeg is the most credible mainstream option.
Explore ethical investing with Nutmeg.
Best for pensions: Moneyfarm
Moneyfarm stands out for pension investors because it is one of the few robo-advisors that pairs a full SIPP product with access to human financial advisers. The service assigns you a dedicated investment consultant — available by phone, email, or video — who reviews your pension situation and can advise on consolidation, contributions, and drawdown planning. Fees are tiered: 0.75% under £10,000, 0.60% up to £50,000, 0.50% up to £100,000, 0.35% over £500,000. For pension investors approaching retirement who want managed portfolios plus human guidance without paying full independent financial adviser rates, Moneyfarm hits the right balance.
Open a pension with Moneyfarm.
Tax Wrapper Guide: ISA vs SIPP vs GIA with Robo-Advisors
All UK robo-advisors offer at least two of these three wrappers. Which one you use changes your tax outcome more than which platform you choose.
Stocks and Shares ISA
The default choice for most robo-advisor investors. Annual allowance: £20,000 (2025/26). All growth and income inside the ISA is tax-free forever — no capital gains tax on withdrawals, no income tax on dividends, no reporting requirement. You can access the money at any time. For investors who want to build a medium-term pot (house deposit, early retirement bridge, life events), the ISA is the right wrapper. All six providers in this guide offer a Stocks and Shares ISA.
SIPP (Self-Invested Personal Pension)
Best for retirement savings. Contributions receive tax relief at your marginal rate — basic-rate taxpayers get 20% added automatically (every £80 you put in becomes £100 in the pension); higher-rate taxpayers reclaim an extra 20% via Self Assessment. Money is locked until at least 57 (rising from 55 in 2028). At retirement, 25% can be taken tax-free; the rest is taxed as income. The combination of upfront tax relief and decades of tax-free compounding makes SIPPs the most mathematically efficient long-term savings vehicle for most employed and self-employed workers. SIPP availability: Nutmeg, Moneyfarm, InvestEngine, Vanguard. Not available via Wealthify.
For a full pension provider comparison including non-robo options, see our best pension providers UK 2026 guide.
GIA (General Investment Account)
No tax advantages — growth and income are subject to capital gains tax and income tax in the normal way. Use a GIA only after you have fully used your ISA allowance (£20,000/year) and/or SIPP allowance (£60,000/year). GIAs are also useful for very specific circumstances: holding investments you want to offset against existing CGT losses, or investing amounts that genuinely exceed ISA and pension allowances combined. For the vast majority of retail investors, the ISA should be filled before a GIA is opened.
| Wrapper | Tax on growth | Tax on withdrawal | Annual limit | Access | Best for |
|---|---|---|---|---|---|
| ISA | None | None | £20,000 | Any time | Medium-term goals; flexible retirement |
| SIPP | None | 75% taxed as income | £60,000 / 100% earnings | Age 57+ | Long-term retirement; tax relief maximisation |
| GIA | CGT on gains | CGT / income tax | Unlimited | Any time | Overflow after ISA + SIPP maxed |
5 Common Robo-Advisor Mistakes
- Choosing the wrong risk level because it "feels safer." The most common robo-advisor mistake is selecting a lower risk profile than your actual time horizon justifies. A 30-year-old choosing Risk Level 3 (Cautious — mostly bonds) for a 30-year retirement pot is leaving substantial return on the table. Bonds outperform cash but underperform equities over long horizons. Match your risk level to your time horizon, not your emotional reaction to the word "cautious." A 30-year-old with no need to access the money for 30 years should typically be at risk level 7–8. Revisit your questionnaire every 3–5 years as circumstances change.
- Paying full managed fees on a large pot when DIY would do. Robo-advisors are valuable for small pots and beginners. Once you understand the underlying strategy (hold a diversified global equity ETF + bond mix, rebalance annually), there is no reason to pay 0.60–0.75% for a service you could replicate yourself with two ETFs on InvestEngine or Vanguard at 0.12–0.37% total cost. A £100,000 pot at 0.60% extra annual fees costs £600/year — or £12,000 compounded over 20 years.
- Withdrawing during a market downturn. Robo-advisors are designed for long-term investing. When markets fall 20–30% (which happens every few years), the automated rebalancing buys more equities at cheaper prices — exactly the right move. Panic-selling locks in losses and means you miss the recovery. The biggest determinant of robo-advisor returns is not fees or portfolio construction — it is whether you stay invested through a crash. If you sold during COVID (March 2020), you missed the fastest bear-to-bull market in history. Robo-advisor behavioural guardrails help, but they cannot stop a manual withdrawal.
- Holding a GIA instead of an ISA for no reason. Some investors open a GIA by default, not realising they have an annual £20,000 ISA allowance sitting unused. All growth and income in a GIA is taxable. All growth and income in an ISA is not. The ISA allowance is use-it-or-lose-it (it doesn't carry forward). If you have money in a robo-advisor GIA and haven't filled your ISA allowance, transferring to the ISA wrapper takes minutes and permanently protects those gains from CGT.
- Treating robo-advisor performance marketing as meaningful. Every robo-advisor publishes performance figures. The problem: they are selectively dated, often show their best risk-level portfolio, and are always measured against a favourable benchmark or time window. Past robo-advisor returns are not predictive of future returns — all platforms hold broadly the same asset classes. The meaningful differentiators are fees, wrapper availability, and service reliability. Don't choose a robo-advisor because its 3-year performance looks good. Choose it based on fees and features.
Robo-Advisors vs Index Funds: What's the Difference?
This question comes up constantly. The short answer: robo-advisors are a service; index funds are an investment type. They are not alternatives — they work together.
Most UK robo-advisors build portfolios entirely from index funds (specifically, ETFs that track market indices). Nutmeg, Moneyfarm, InvestEngine, and Wealthify all hold index-tracking ETFs inside their portfolios. The robo-advisor layer is the service that selects the funds, sets the allocation, and rebalances automatically. The index funds are the underlying investments doing the actual work.
DIY index fund investing (via platforms like Vanguard, InvestEngine DIY, or AJ Bell) means you are doing the robo-advisor's job yourself: choosing which index funds, setting the allocation, and rebalancing manually. It is cheaper, but it requires understanding. For the full index fund comparison including global trackers, bond funds, and portfolio construction, see our best index funds UK 2026 guide.
For investors who want a trading platform for individual shares and ETFs alongside their robo-advisor, see our best trading platforms UK 2026 comparison.
Which Robo-Advisor Should You Choose?
The decision tree is simpler than the comparison table makes it look:
- First time investing, small amount (<£5,000): Wealthify or Moneybox. Get started now. Don't overthink it.
- Want lowest fees, happy to pick 2–3 ETFs yourself: InvestEngine DIY or Vanguard. Nothing cheaper exists.
- Want managed portfolio, pot £10,000–£50,000: Nutmeg Fixed Allocation (0.25% + OCF ≈ 0.45% total) is the best managed option at this range.
- Building a pension, want human access: Moneyfarm. The SIPP + adviser access combination is unique.
- Ethical investing is non-negotiable: Nutmeg Socially Responsible. The most transparent ESG portfolio construction of the mainstream options.
- Pot over £50,000, understand basic investing: InvestEngine DIY or Vanguard. At this scale, paying for managed service is hard to justify.
The best robo-advisor is the one you actually use consistently. A slightly higher-fee platform you contribute to monthly beats a theoretically cheaper platform you never opened. Start, contribute regularly, and revisit fees once the pot reaches a size where the difference genuinely matters.
For the ISA wrapper comparison across both robo and DIY platforms, see our best Stocks and Shares ISA 2026 guide.