These are the apps and services I actually use for my money experiments, and a few of them pay you for joining. This page lists my referral and affiliate links. If you sign up through one, I may get a reward, and some give you one too. Invest £100 or more with InvestEngine and we each get an investment bonus of £20 to £200. Sign up to Hey!Broadband with my code and we each get a £50 Amazon voucher once you're installed and your cooling-off period ends. Those two are at the top.
You might pick up a bonus too, and any reward I get helps keep this website running so I can keep sharing more experiments with you.
Proton is the big saver. Proton Mail runs all my Mars Money Lab emails and Proton Pass keeps my passwords, and from 26 October to 30 November my links get you up to 75% off in their Black Friday sale. The rest are everyday tools with no bonus right now, but I'd use them anyway. Todoist has kept my to-do list since January 2018, and Revolut is my go-to for swapping pounds into dollars or euros. Each card says what it is, and most link to my page on how I use it. Filter by what you're after, or just scroll.
Last checked: 15 October 2026
Proton Black Friday: up to 75% off
I use Proton every day for my email, so this is the one deal I'd actually point you to. From 26 October to 30 November:
- VPN Plus: 75% off the 24-month plans
- Mail Plus, Drive Plus or Pass Plus: 60% off the 12-month plan
- Proton Unlimited: 50% off the 12-month plan
My link takes you straight to the Black Friday offer.
InvestEngine
Automated ETF investing.
You build your own ETF portfolio or let them manage it, and you can put as little as £1 into any ETF. Invest £100 or more through my link and we each get an investment bonus of between £20 and £200. InvestEngine picks the amount at random, and the bonus has to stay invested for 12 months.
Capital at risk. Investments can go down as well as up.
Sign up: https://marsmoneylab.com/investengine-signup
Read my experiment: https://marsmoneylab.com/etf-dividends/
Hey!Broadband
A UK full fibre broadband provider.
Sign up online with my code, get installed, and once your cooling-off period ends we each get a £50 Amazon voucher. They call it a limited-time offer.
Code: HeyMarcelBa736
Read my experiment: https://marsmoneylab.com/heybroadband-lab-savings/
eToro
An investing platform for shares, ETFs and crypto.
I use it for my Tesla experiment, buying at least £40 of Tesla stock every week.
Capital at risk. Investments can go down as well as up.
Sign up: https://marsmoneylab.com/etoro-signup
Read my experiment: https://marsmoneylab.com/etoro/
Koinly
Works out tax reports for crypto.
I've used it to prepare my HMRC returns for the past two years.
Sign up: https://marsmoneylab.com/koinly-signup
Tool page: https://marsmoneylab.com/koinly/
Lebara
SIM only phone plans.
I've been with Lebara for over five years and I'm on the 5GB monthly plan.
Sign up: https://marsmoneylab.com/lebara-signup
Read my experiment: https://marsmoneylab.com/lebara-lab-savings/
Ledger
A hardware wallet for keeping crypto offline.
Monzo
A UK bank you run from an app, with Pots for sorting your money.
You can spend abroad in any currency with no Monzo fees, and eligible deposits are protected by the FSCS up to £120,000.
Sign up: https://marsmoneylab.com/monzo-signup
Tool page: https://marsmoneylab.com/monzo/
NordVPN
A paid VPN service.
I've used it since 2022 on my laptop and other devices, on public Wi-Fi and at home.
Sign up: https://marsmoneylab.com/nordvpn-signup
Tool page: https://marsmoneylab.com/nordvpn/
Outplayed
Tools and guides for matched betting.
I follow its calculators and step-by-step offers, usually for about an hour a week.
Sign up: https://marsmoneylab.com/outplayed-signup
Read my experiment: https://marsmoneylab.com/outplayed/
Plutus
A debit card that pays rewards in its own crypto token, Pluton.
The rewards you earn can be redeemed for gift cards.
Sign up: https://marsmoneylab.com/plutus-signup
Read my experiment: https://marsmoneylab.com/plutus/
Proton
Swiss privacy tools: encrypted email, a VPN, a password manager and cloud storage.
I use Proton Mail for all my Mars Money Lab emails and Proton Pass to store my passwords.
Proton Mail: https://marsmoneylab.com/proton-mail-signup
Proton VPN: https://marsmoneylab.com/proton-vpn-signup
Proton Pass: https://marsmoneylab.com/proton-pass-signup
Proton Drive: https://marsmoneylab.com/proton-drive-signup
Tool page: https://marsmoneylab.com/proton/
Revolut
A money app for spending, saving and sending money abroad.
I use it mainly for international transfers, swapping GBP into USD or EUR.
Sign up: https://marsmoneylab.com/revolut-signup
Tool page: https://marsmoneylab.com/revolut/
Todoist
A to-do list app.
I've used it every day since January 2018 to keep on top of work, travel and tax deadlines.
Sign up: https://marsmoneylab.com/todoist-signup
Tool page: https://marsmoneylab.com/todoist/
Trading 212
An app for investing in shares and ETFs.
You can also open a Stocks and Shares ISA in the same app.
Capital at risk. Investments can go down as well as up.
Offers can change or be withdrawn at any time. Check the terms before you sign up. This is not financial advice.
