There’s no single best expense tool — there’s a best one for your situation. Here’s the short version before the detail:
- Expensify is built for companies where employees submit receipts for reimbursement. Best for teams of 50+ doing high-volume receipt scanning.
- Wave is free accounting plus invoicing. Best for freelancers who need to send invoices and keep books in one place.
- Money OS is expense tracking, budgets, and multi-client tracking with team roles. Best for freelancers, agencies, and small teams who want financial clarity without accounting software.
The comparison table, then the honest recommendation for each type of user.
At a glance
| Money OS | Wave | Expensify | |
|---|---|---|---|
| Core price | Free | Free (pay for payments/payroll) | Free tier, then ~$5–9/user/mo |
| Built for | Freelancers, agencies, teams | Freelancers who invoice | Companies reimbursing employees |
| Expense tracking | ✓ | ✓ | ✓ (receipt-first) |
| Category budgets + alerts | ✓ | ✕ | ✕ |
| Multi-client tagging | ✓ | Partial | ✕ |
| Invoicing | ✕ | ✓ | ✕ |
| Full accounting / ledger | ✕ | ✓ | ✕ |
| Receipt scanning (SmartScan) | Manual | Basic | ✓ (best in class) |
| Team roles | ✓ | Limited | ✓ |
| CSV import | ✓ | ✓ | ✓ |
Expensify: built for reimbursement at scale
Expensify’s core strength is SmartScan — photograph a receipt and it extracts the merchant, date, and amount automatically, then routes it through an approval and reimbursement workflow. For a 200-person company where employees expense travel and meals, this is genuinely excellent and worth the per-user price.
For a solo freelancer, most of that machinery is overhead you’ll never use. You don’t need an approval workflow to approve your own coffee. And the per-active-user pricing means costs climb as your team grows.
Choose Expensify if: you have employees submitting expense reports for reimbursement, and receipt volume is high enough that automated scanning saves real time. You can start a trial through this link to test SmartScan with your own receipts.
Wave: free accounting and invoicing
Wave is the most generous free tool here because its money-maker is payment processing, not subscriptions. You get real double-entry accounting, unlimited invoicing, and bank connection — for nothing — and Wave earns when a client pays an invoice through its processor.
The trade-off is scope. Wave is accounting software, so it carries accounting concepts (chart of accounts, journal entries) that are more than a freelancer who just wants to track spending and set a budget needs. And it has no real budgeting feature — you can see where money went, but it won’t alert you before you overspend a category.
Choose Wave if: you send invoices and want bookkeeping in the same place, for free. It’s the strongest free alternative for invoicing of the three. If invoicing is the job, Wave wins.
Money OS: tracking, budgets, and multi-client without the accounting
Money OS sits deliberately between a spreadsheet and accounting software. It does the day-to-day financial control that freelancers and small teams actually touch every week — track expenses, tag them to clients, set category budgets with alerts, and pull tax-ready reports — without asking you to learn a ledger.
Two things it does that the other two don’t:
- Category budgets with alerts. Set a monthly limit per category and get warned at 80% before you blow past it. Wave and Expensify both track what you spent; neither helps you not overspend.
- Multi-client tagging as a first-class feature. Tag any transaction to a client and flag it reimbursable, then generate per-client summaries for billing. Agencies use this to see which clients are actually profitable.
What it deliberately doesn’t do: invoicing and full accounting. If you need to send invoices, pair Money OS with a dedicated invoicing tool, or use Wave. Money OS exports cleanly to QuickBooks, Xero, and Tally when formal accounting is needed.
Choose Money OS if: you want budgets, multi-client tracking, and team roles for free, and you handle invoicing elsewhere (or don’t invoice at all). It’s purpose-built for freelancers and agencies.
The honest recommendation
- Solo freelancer who invoices clients: Wave. Free invoicing plus bookkeeping in one place is hard to beat.
- Freelancer or agency who wants budgets and per-client profitability: Money OS. Budgeting and client tagging are its whole point, and it’s free for that.
- Company with employees expensing receipts for reimbursement: Expensify. The scanning and approval flow earns its per-user cost at scale.
- Someone who wants budgets and invoicing: use two tools — Money OS for tracking and budgets, Wave for invoices. Both are free.
There’s no shame in running two free tools that each do one thing well, instead of one paid tool that does everything adequately.
The bottom line
Match the tool to the job: invoicing → Wave, reimbursement at scale → Expensify, budgets and multi-client tracking → Money OS. All three import CSVs, so you can trial any of them against your real transactions in an afternoon before committing.