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Best rent split apps: 11 ranked for month four

September 22, 2026 · 14 min read · Dimesum Engineering · reviewed by Jagadeep Sai

Rent is the hardest test a split app takes, because it repeats every month, so we ranked eleven tools on the one thing that matters by month four: fixing month one without rewriting month three.

Three or four of you share a flat, and the rent never changes. The arguments do. If you want the short answer, here it is.

A calculator clears one dinner and forgets it by morning. A phone ledger remembers every month, which is what rent needs. And a bank feature settles fast, as long as everyone banks in the same place.

This is a guide to rent split apps for people who already share a wall. Dimesum is one of them, and it's ours, so we'll say where it wins and where it's still new. Our starting point is the rent guide.

*Eleven rent split apps, on the four things that decide it*

What a rent split app has to survive

A roommate expense app has to survive five things that a bill splitter for a single night never meets. Rent is the test, because rent repeats. Here's an example we'll carry through, and we'll label it an example: a flat of 2,400 in one currency, three people, three rooms.

1. A rent that repeats without being retyped

The amount is the same in month one and month four. The people are the same. Only the exceptions move: a guest week, a broken boiler, a bill that crept up. So the real work isn't the split, it's the repetition.

A tool that asks you to re-enter 2,400 and re-pick three names every month is a tool you'll stop opening by month four. What you want is a rent that carries forward on its own, with last month's split as the starting point, so you touch only what actually changed. Set it once, then correct the edges as they come.

2. Uneven rooms, so the split is by weight and not by headcount

Three people, three rooms of 14, 11 and 9 square metres. Split by headcount, everyone pays 800, and the person in the smallest room subsidises the person with the largest. Split by area, the shares become 988, 776 and 636.

Now add the one ensuite, in room A, valued at 60 a month. Room A goes to 1,028, the other two settle at 756 and 616, and the totals still add to 2,400. A rent split app has to hold weights like these and apply them every month, not ask three flatmates to argue the fractions again in month two.

3. Somebody moving in or out partway through the month

In month two, Sofia moves out on the 17th. She doesn't owe a full month and she doesn't owe nothing. She's there for 17 of 30 days, so she carries 56.7% of her room's share, and whoever takes the room picks up the rest.

A tool that only knows whole months can't post that. It rounds, or it argues, or it quietly overcharges someone by a few units that nobody chases. The mechanic you need is a share that can be a fraction of a month, applied to one person without disturbing the other two.

4. A utility bill that changes every time

Rent holds still; the wifi doesn't. In month three it goes up. Next quarter the heating lands, then a single charge for the landlord's cleaner. These aren't the rent, but they ride on the same split, and they change every cycle.

So a rent tool can't treat the monthly total as one fixed number. It needs the fixed part, the rent, to repeat untouched, and the moving part, the bills, to be entered fresh each month and split however that particular bill was actually shared. Two rhythms, one balance.

5. An edit in month three that must not rewrite month one

In month four, someone notices the month one figure was wrong: a typo nobody fixed, off by a few units. Here's the fork. A weak tool lets you overwrite month one, and now every balance since silently shifts, and no one can say what changed or when.

A ledger does the opposite: it posts a correction dated to today, and month one's original entry stays exactly as it was. The past is readable; the fix is visible. That's the whole reason an edit must restate its split rather than replace it.

The 11 best rent split apps, ranked

A split rent app lives or dies on repetition, so we ranked these on four things that only show up once rent repeats. First, an edit that keeps history, so month four can fix month one. Second, balances per currency, for flatmates who don't all earn in the same money. Third, settling in fewer transfers, so three people clear a month in as few payments as possible.

Fourth, getting your data out, so leaving a flat doesn't mean losing the record. The order below follows those four. We say nothing bad we can't source, and we start with our own tool, so you know where we stand.

1. Dimesum

Dimesum is for three or four flatmates who pay the same rent every month and want month one fixable without touching month three. Against the four criteria: it runs an append-only, double-entry ledger, so an edit posts a compensating entry and the original stays readable; a rule posts the rent each month with the split pinned to it, so nobody retypes it and nobody inherits last month's shares by accident; it keeps balances per currency; it settles in at most one transfer fewer than the number of people in the group; and your record is yours, since an account can be deleted, which is the same reasoning behind deleting the parser that used to guess at a bill. It never holds or moves money.

It's free. The honest part: Dimesum is new, it has no app store listing yet, and it runs in the browser rather than as an installed app. We're number one on our own list, so weigh that as you like, but the four criteria are the reason, not the ranking.

2. Splitwise

Splitwise is a phone ledger that flatmates and travellers use to track who owes whom; it runs as a phone app, plus a web app that asks everyone to sign in. It has a free tier and a paid tier, Pro; as of August 2026 its US prices in the app have ranged from $2.99 to $39.99, and regional pricing varies widely. Where it meets our four criteria less squarely: reviewers report a daily cap on the free tier, though the company doesn't document one, so treat that as reported and not a fixed number; and the JSON backup that gets your data out is a Pro feature, so on the free tier the fourth criterion sits behind the paywall.

3. Tricount

Tricount is a phone app for splitting shared costs on trips and in flats, owned by the bank bunq. Typically one person starts a tricount, the others join, and everyone adds what they paid as the month goes. It's free.

The plain limitation the source gives is that its Premium tier was withdrawn, so what you get is the free app and nothing beyond it, with no paid path to add features later. Everything it does, it does on that one tier. That's fine until the day you want something it doesn't offer, and find there's no upgrade to reach for and no documented plan to buy.

4. Splid

Splid is a phone app for group expenses, the kind a shared flat or a trip runs on. You pay for it once: a single purchase of $3.99, with no ads and no subscription, which some flatmates prefer to a recurring fee. The plain limitation from the source is about upkeep, not price: its Android release hadn't been updated for about twelve months as of August 2026. A year without an update on one platform is the sort of thing worth checking before three or four of you commit a year of rent to it, since rent is exactly the use that runs long.

5. Settle Up

Settle Up is a phone app for shared group costs, used by flatmates and travelling groups to keep a running tally. Its pricing is a subscription, plus a purchase one person can buy for the whole group, ranging from $5.99 a week to $149.99 once. That's the limitation worth naming: the table records only paid access for it, so unlike most tools here there isn't a free path, and the group has to decide who pays for the app before it can settle who pays for the flat. The single purchase option caps at $149.99, which spreads across a group but is still a purchase someone has to make.

6. Tab

Tab is a phone app for splitting bills, the sort you'd open at a shared dinner or for the flat's shared list. It's free, and how it makes money isn't published, so there's nothing in the source to tell you what sustains it. The plain limitation is upkeep: its Android release hasn't been updated since May 2023.

That's a long gap for a tool you'd lean on every month, and with no published revenue behind it, the source gives you little to weigh on whether that gap closes. For rent, which runs month after month, longevity is part of the spec.

7. Spliit

Spliit is open source and runs in a browser or on your own server, which appeals to flatmates who'd rather host their own record than hand it to someone else's app. It's free; the project reported about $1,300 of income in a year, most of it from its own founder, which tells you how small the operation behind it is. The plain limitation the source names is reach, not function: there's no app store listing, so you install nothing from a store and there's no store presence to find it through. You reach it as a website, or you run it yourself, and for some flats, running it yourself is the appeal rather than the cost.

8. Kittysplit

Kittysplit is a plain website with no account, used to split a single cost fast and then walk away. It ranks at or near the top for calculator queries in this category, which is evidence that plenty of people want the arithmetic without signing up for anything. It's free.

The limitation is built into what it is: the source lists it as a calculator, not a ledger, so there's no ongoing record to carry into next month and nothing to edit when month one turns out wrong. For a single shared cost like a restaurant bill, that's often all you need, and we've written about how to split a restaurant bill fairly. For rent, which is the opposite of a single cost, the missing ledger is the whole problem.

9. Venmo Groups

Venmo Groups is a groups feature inside Venmo, with running balances and simplification for up to 30 people; it has been live since November 2023. It's free. The plain limitation is reach: it's United States only, and everybody in the group needs Venmo.

For a flat where all three or four people already bank there, that closes the loop quickly. For a flat with one flatmate abroad, or one who doesn't use Venmo, the feature can't include them, and a rent split that leaves one person out isn't a split. It's the same reason the tools that live inside one shared account work best when the whole flat already uses it.

10. Revolut Group Bills

Revolut Group Bills is a group bills feature inside Revolut for 2 to 20 people, with a feature it calls Smart Settle; it has been live since August 2020. On cost, Revolut's own terms say it does not currently charge a fee. The plain limitations the source gives are two: the group caps at 20 people, which most flats sit well under, and it centres on Revolut, so people without an account take part through a web link rather than the app itself.

For a flat where everyone already uses Revolut, that works without a link. For a mixed flat, the link is the bridge, and it's worth knowing that bridge is there before you rely on it.

11. Monzo Split

Monzo Split is a split feature inside Monzo, with unlimited expenses and partial settlement; it was rebuilt in March 2025. It's free, and Monzo advertises no paywalls and no ads. The plain limitation is where it lives: it's a feature inside Monzo, so the account holder runs it from there.

On guests, the source is specific: they can join by link with no Monzo account and no UK address needed. For a flat anchored by one Monzo holder, with the rest joining by link, that covers the group without asking everyone to switch banks.

How to choose one before the next rent day

There's no single winner here, only the tool that fits how your flat actually pays. The best app to split rent is the one you'll still open in month four, so choose for the long test, not the first evening.

1. Start from month four, not month one

Most tools feel fine on the first night. The question is whether they'll feel fine on the twelfth, when rent has repeated eleven times and someone's changed rooms. Picture your flat four months out and ask which tool still holds up.

The arguments are rarely about the amount anyway; the numbers back that up. They're about the edits, the exceptions, and who remembers what.

2. Split by the rooms you actually have

If your rooms are the same size, headcount is fine. If they aren't, pick a tool that splits by weight, so the person in the smaller room isn't quietly paying for the bigger one. Agree the weights once, from floor area or an ensuite's worth, and let the tool apply them every month. Settle the fractions in month one so month five never reopens them.

3. Test a move partway through the month before you need it

Someone always leaves or arrives partway through a month. Before you commit, add a fake move on, say, the 17th, and see whether the tool can charge a fraction of a month to one person without disturbing the others. If it can only do whole months, you'll be doing that maths by hand every time it happens, and by hand is where the typos start.

4. Decide whether you all bank in the same place

Some of the fastest tools live inside one bank or one payment app, and they're quick when the whole flat is already there. The moment one flatmate is abroad or on a different app, that speed turns into a wall. If your flat spans currencies, weigh a tool that keeps balances per currency, and read up on the money bugs that hide in mixed currencies before one bites you.

5. Make sure you can walk out with your data

Flats end. When yours does, you want the record to leave with you, not to vanish with a cancelled subscription or stay locked in someone else's account. Before you commit a year to a tool, find the export, or the backup, or the delete, and try it once. A tool you can leave cleanly is a tool you can trust to hold the months while you're in it.

Whichever way your flat leans, the test is the same: does month four still make sense, and can you fix month one without rewriting month three? If that's the bar you want to hold a tool to, start a group on Dimesum and run your next rent through it.