I'll be honest — I didn't think rounding up my spare change would amount to much. 47p here, 12p there. But when I checked my Chase round up savings after six months, I'd quietly stashed over £300 without noticing a single penny leave my account. That got my attention.
If you're looking into round up savings UK options, you've got more choice than ever in 2026. Chase, Monzo, Starling, Plum, Moneybox — they all do it slightly differently. I've tested every one of them over the past year, and the differences actually matter more than you'd think.
Here's exactly how each one works, what you'll realistically save, and which one I'd pick depending on your situation.
What Are Round-Up Savings and How Do They Work?
Round-up savings automatically round every card purchase up to the nearest pound and move the spare change into a savings pot or account. Spend £2.60 on a coffee, and 40p gets swept away into savings.
It's dead simple. That's the whole point. You don't decide to save — your spending does it for you. The amounts are so small you genuinely don't feel them, but they compound surprisingly fast. Most people making 3-5 card transactions a day will save between £30 and £60 a month on round-ups alone.
Some apps let you multiply your round-ups (2x, 3x, even 10x), which is where things get interesting — and where the differences between providers start to show.
Chase Round Up Savings UK: The One Most People Start With
Chase UK's round-up feature sends your spare change straight into a savings account earning 3.5% AER (as of April 2026). That interest rate is what makes Chase stand out — most round-up destinations pay far less or nothing at all.
Setting it up takes about 30 seconds. Open the Chase app, tap your savings account, toggle on "Round-ups." Done. Every debit card purchase gets rounded up and the difference moves automatically. No multiplier option, though — it's 1x only.
What I like: the interest rate is genuinely competitive, there's no faff with third-party connections, and the app is clean. What's a bit rubbish: you can't customise the round-up amount or apply multipliers. It's simple to a fault.
Realistic 12-month projection: If you average 4 transactions a day with an average round-up of 50p, that's roughly £60/month or £720/year — plus around £13 in interest at 3.5%. Not life-changing, but £733 you wouldn't have saved otherwise? I'll take it.
Monzo Round-Ups: Most Flexible for Tweaking
Monzo gives you more control than any other bank here. You can round up to the nearest pound and send it to any Pot — including ones earning interest through partner banks.
The big feature is multipliers. Set your round-ups to 2x or 3x and that 40p coffee round-up becomes 80p or £1.20. I ran mine at 2x for three months and barely noticed, but my savings pot grew noticeably faster. You can also lock Pots so you can't dip into them on a weak Friday evening.
Setup: open Monzo, go to a Pot, tap the gear icon, enable "Round up transactions." Choose your multiplier. Sorted.
One thing — Monzo Pots don't all earn interest. The instant access ones pay nothing. You need to pick a fixed-term or notice Pot from a partner bank to get a decent rate, and those have withdrawal restrictions. Bit of a trade-off.
12-month projection at 2x: Same 4 daily transactions, 50p average round-up doubled to £1 = roughly £120/month or £1,440/year. Significantly more than Chase, but you'll feel the £120 monthly outflow more than £60.
Starling Bank: Solid but Basic
Starling's round-up feature works almost identically to Chase. Purchases get rounded up, spare change goes into a "Savings Space." No multipliers, no custom amounts.
Starling Spaces currently earn up to 3.25% AER on balances, which is decent but slightly behind Chase. The app itself is excellent — I actually prefer Starling's interface for day-to-day banking. But purely on the round-up feature, there's not much to separate it from Chase.
Setup: tap Spaces → create a Space → toggle "Round up purchases." About 20 seconds.
Starling's real strength is if you already bank with them. If you're choosing a bank specifically for round-ups, Chase edges it on interest rate. But if Starling's your main account, there's no reason to look elsewhere just for this feature.
Plum: Best for Aggressive Automated Saving
Plum takes a different approach. Yes, it does round-ups, but it also analyses your spending and automatically sweeps money it thinks you won't miss into savings. That AI-driven sweep is what makes Plum genuinely different.
I was checking my Plum account while waiting for the kettle to boil one morning and realised it had saved £47 that week — £12 from round-ups and £35 from automatic sweeps. I hadn't approved any of it. Slightly unnerving the first time, honestly, but the algorithm is conservative enough that I've never been caught short.
The free tier gives you round-ups and basic auto-saving. Plum Pro (£2.99/month) adds multiplied round-ups, interest on your balance, and more aggressive saving modes.
12-month projection: Round-ups plus AI sweeps together typically save between £100-£200/month for average earners. Call it £1,500-£2,000 over a year. That's in a completely different league to bank round-ups alone.
Moneybox: Best If You Want to Invest Your Round-Ups
Moneybox rounds up your purchases and invests the spare change into a stocks and shares ISA, lifetime ISA, or pension. If you want your round-ups actually working harder over years rather than sitting in cash, this is the one.
You connect your bank accounts (works with most UK banks), and Moneybox tracks your spending, rounds up, and invests weekly. You choose your risk level — cautious, balanced, or adventurous.
Setup is a bit more involved: download the app, verify your identity, link your bank via Open Banking, choose your investment wrapper, pick a risk profile. Takes about 10 minutes rather than 30 seconds. But you only do it once.
The catch: there's a £1/month platform fee, plus fund charges of 0.12-0.45%. On small balances those fees eat into returns. Moneybox makes more sense once your round-ups have built up to £500+, or if you're topping up manually alongside the round-ups.
Round-Up Savings Comparison Table
| App | Round-Up Multiplier | Interest / Returns | Monthly Fee | Best For |
|---|---|---|---|---|
| Chase | 1x only | 3.5% AER (savings) | Free | Simple set-and-forget |
| Monzo | Up to 3x | 0-4.1% (depends on Pot) | Free | Customisation and control |
| Starling | 1x only | 3.25% AER (Spaces) | Free | Existing Starling users |
| Plum | Up to 10x (paid) | Up to 3.91% AER | Free / £2.99 Pro | Aggressive automated saving |
| Moneybox | 1x-10x | Market returns (invested) | £1/month | Long-term investing |
Which Round-Up Savings App Should You Actually Pick?
The best round up money saving app depends entirely on what you want the money to do.
Just want easy savings with good interest? Chase. No contest. The 3.5% rate on a free account with zero faff is hard to beat.
Want more control and bigger round-ups? Monzo. The multiplier feature genuinely makes a difference — I wrote about how I combine round-ups with standing orders and the two together moved my monthly automated savings past £400.
Want to save aggressively without thinking? Plum. The AI sweeps on top of round-ups make it the most powerful option for people who just want money quietly moved out of reach.
Want to invest for the long term? Moneybox. Especially useful if you're contributing to a LISA for a first home — the government bonus on top of round-up contributions is free money.
And honestly? You don't have to pick just one. I run Chase round-ups on my daily spending card and Plum on my main current account. They don't interfere with each other.
How to Get Started Today
Pick one app from the list above. Just one — you can always add more later.
- Download the app and create an account (5 minutes max)
- Enable round-ups in settings
- If available, set a 2x multiplier — you won't notice the difference day-to-day
- Set a calendar reminder to check your balance in 30 days
That's it. No spreadsheets, no willpower, no remembering to transfer money on payday. The whole point of an app that saves money for you automatically is that you do the setup once and forget about it.
If you're also looking to get a handle on where your money goes each month — especially subscriptions and direct debits that quietly drain your account — I put together a guide on auditing every direct debit that pairs well with round-up savings. Cut the waste, round up the rest.
Free tool: Use our Subscription & Direct Debit Audit spreadsheet (free) to find out exactly where your money goes each month. See all our UK finance tools.