When Zo started investing, we had no idea which platform to pick. There are SO many options. So we tried them. Here's our honest take on what works — and what doesn't — for teen investors in the UK.
🎯 Quick Answer
If you want to skip the details: Hargreaves Lansdown is what we actually use for Zo's Junior ISA. UK's largest investment platform, FTSE 250 listed, 1.8 million clients, and the widest range of investments. If you want a simpler free option to learn with, Trading 212 is excellent too.
Open HL Junior ISA → This is an affiliate link — we may earn a small commission if you sign up. This doesn't affect our opinions.What We Looked For
Not all investment apps are created equal — especially for teens. Here's what mattered to us:
- Junior ISA support — Tax-free investing for under-18s
- Low or no fees — Every pound saved is a pound invested
- Low minimum — We started with £1,000, not £10,000
- Fractional shares — Buy £10 of a £300 share
- Easy to use — Zo's 15, not a finance pro
- Educational tools — Practice mode, learning resources
The Contenders
We tested these 6 platforms extensively:
Quick Comparison Table
| Platform | JISA | Min | Fees | Fractional | Practice | Our Rating |
|---|---|---|---|---|---|---|
| Hargreaves Lansdown | ✓ | £1 | 0.25% | ✗ | ✗ | ⭐⭐⭐⭐⭐ |
| Trading 212 | ✓ | £1 | £0 | ✓ | ✓ | ⭐⭐⭐⭐⭐ |
| Freetrade | ✓ | £1 | £0 | ✓ | ✗ | ⭐⭐⭐⭐ |
| InvestEngine | ✓ | £1 | £0 | ✓ | ✗ | ⭐⭐⭐⭐ |
| Moneybox | ✓ | £1 | £1/mo | ✓ | ✗ | ⭐⭐⭐ |
| Vanguard | ✓ | £500 | 0.15% | ✗ | ✗ | ⭐⭐⭐ |
Detailed Breakdown
Hargreaves Lansdown
This is where Zo's Junior ISA actually lives. The UK's largest investment platform — and we picked it for a reason.
What We Love
- Most trusted UK platform — FTSE 250 listed, 1.8 million clients, been around since 1981. Your money is with a serious institution.
- Widest investment choice — Over 2,500 funds, shares across global markets, ETFs, bonds. If it exists, HL probably has it.
- Excellent research & tools — Wealth Shortlist (curated fund picks), detailed fund analysis, market news. Genuinely useful for learning.
- FSCS protected — Up to £85,000 covered by the Financial Services Compensation Scheme.
- Junior ISA with full control — Parent manages until 18, then it converts to a regular ISA in the child's name. £9,000 annual allowance (2025/26).
- Phone support — Actual humans you can call. Rare in fintech.
What Could Be Better
- 0.25% annual platform fee — Free platforms exist, but you're paying for reliability, research, and range. On a £5,000 portfolio that's £12.50/year.
- £11.95 per share deal — Individual stock trades aren't cheap. Funds are free to buy/sell though.
- No fractional shares — Can't buy £10 of a £300 stock. You buy whole shares.
- App feels more "adult" — Not as slick as Trading 212, but it's a proper investment platform, not a trading game.
Why We Chose HL
"Dad wanted somewhere safe and serious for my money. We're not day-trading — we're building a uni fund. HL felt like the grown-up choice, and honestly, the research tools help me understand what I'm buying." — Zo
Trading 212
If you want zero fees and a great app to learn with, Trading 212 is hard to beat. We used it to practice before committing real money on HL.
What We Love
- Zero fees — No trading fees, no platform fees, no hidden costs. Every penny goes into investments.
- Practice mode — Zo learned the basics with £10,000 fake money before risking a penny real.
- Fractional shares — We bought £50 of Tesla when one share costs £250+.
- Auto-invest — Set up monthly deposits and it invests automatically.
- Clean app — Actually looks like something a teenager would use.
What Could Be Better
- Limited research tools (but honestly, we use other sites for research)
- No phone support (email only)
- Only available in UK/EU
Our Experience
"I like that I can check my portfolio on my phone and it actually makes sense. The practice mode was huge — I made all my mistakes with fake money first." — Zo
Freetrade
Very similar to Trading 212 with commission-free trading. A solid alternative if you prefer a different app experience.
What We Like
- Commission-free trading
- Clean, simple interface
- Good selection of stocks and ETFs
- Stocks & Shares ISA available
Keep in Mind
- No practice mode (you're trading real money from day one)
- Some advanced features require paid subscription
- Customer service can be slow
Our Experience
We tested Freetrade alongside Trading 212. Both are good, but Trading 212's practice mode gave it the edge for a beginner.
InvestEngine
Great for passive investors who want their portfolio managed automatically. Less hands-on, more "set it and forget it".
What We Like
- Zero commission on ETFs
- Managed portfolios available
- Good for passive investing
- Tax-efficient portfolios
Keep in Mind
- ETFs only (no individual stocks)
- Less control over specific investments
- Newer platform, smaller track record
Moneybox
Famous for "round-ups" — investing spare change from purchases. Fun idea, but watch the fees.
What We Like
- Round-ups make investing feel automatic
- Good for building a saving habit
- Nice app design
- Lifetime ISA available
Keep in Mind
- £1/month fee adds up on small portfolios
- Limited investment choices
- Round-ups alone won't build serious wealth
Our Take
Round-ups are fun, but we prefer making intentional monthly investments. The £1/month fee is 1.2% on a £1,000 portfolio — that's more than Vanguard charges.
Vanguard
The heavyweight champion of low-cost investing. Great for large portfolios, less ideal for beginners with small amounts.
What We Like
- Ultra-low fund fees (0.07% - 0.15%)
- Huge range of index funds
- Trusted, established brand
- Owned by its investors (no shareholders)
Keep in Mind
- £500 minimum OR £100/month commitment
- No fractional shares
- Website feels dated
- Better for larger portfolios
Our Take
We'll probably move to Vanguard when Zo's portfolio hits £10,000+. For now, the minimums and lack of practice mode make it less ideal for a beginner.
Our Honest Recommendation
If you're a UK teen (or parent of one) starting your investing journey:
- Open a Junior ISA on Hargreaves Lansdown — This is where your real money goes. Trusted, regulated, widest choice. It's what we use.
- Use Trading 212's Practice mode to learn — Trade with fake money first. Make your mistakes for free.
- Start investing on HL — Once you're confident, put real money to work. Funds are free to buy, and the research tools help you pick.
- Set up regular investing — HL's regular investing feature buys automatically each month for just £1.50 per deal (vs £11.95 one-off).
Frequently Asked Questions
Can a 15-year-old open an investment account in the UK?
No, a 15-year-old cannot open an investment account alone. However, a parent or guardian can open a Junior ISA (JISA) on their behalf. The parent manages the account until the child turns 18, when it converts to a regular ISA in their name.
What's the minimum age for investment apps?
Investment apps require users to be 18+ to open their own account. For teens under 18, a parent must open a Junior ISA. Some apps like Trading 212 allow the teen to help manage investments with parental oversight.
Is Trading 212 safe for teens?
Trading 212 is regulated by the FCA (Financial Conduct Authority) and covered by the FSCS (Financial Services Compensation Scheme) up to £85,000. Your investments are held separately from the company's funds. However, all investing carries risk — you could lose money.
What's better: Trading 212 or Vanguard?
For beginners with small amounts (£1-£10k), Trading 212 is better due to zero fees, practice mode, and fractional shares. For larger portfolios (£10k+), Vanguard may be better due to ultra-low fund fees (0.15%). We use Trading 212 now, may switch to Vanguard later.
How much should a teen invest per month?
There's no right answer, but we recommend starting with what you can afford to lose. Zo invests £250/month — a balance between building good habits and not overcommitting. Even £25/month adds up over time thanks to compound interest.
Do these apps charge hidden fees?
The apps we reviewed (Trading 212, Freetrade, InvestEngine, Vanguard) don't charge hidden fees, but there may be FX fees (0.15% on Trading 212 for non-GBP stocks) and fund management fees (built into ETF prices). Always read the fee schedule.
Ready to Start?
Join Zo on the journey from £1,000 to £60,000.
Capital at risk. Investments can go down as well as up. This is not financial advice. Past performance is not a guide to future results. Please do your own research before investing.
📚 Further Reading
Books that shaped how we think about investing — available on Amazon UK:
- Broke Millennial — The starter guide written specifically for young people
- I Will Teach You to Be Rich — The most practical money system for beginners
- Invested — A daughter learns to invest alongside her dad — perfect fit
- The Psychology of Money — Understanding your own money behaviour matters more than app choice
Important: This is not financial advice. We're sharing our personal experience. All investing involves risk — you could lose money. Always do your own research. If you're unsure, speak to a qualified financial advisor.
This post contains affiliate links. If you sign up through our links, we may earn a commission at no extra cost to you. This helps support Zo's university fund. We only recommend what we actually use. Full disclosure.