Firefly III vs Plum
Side-by-side comparison — pricing, features, ratings, use cases. Find which Budgeting Apps fits you best.
🔍 Independently researched ·
📊 Data-driven
31/100
Free tier
Privacy-conscious individuals who are comfortable with self-hosting and want a powerful, double-entry personal finance m
💰 Pricing
🆓 Free tier available
The full software is free with no feature restrictions. The only cost is your own infrastructure for self-hosting.
Fee notes:
- Firefly III is free and open-source under GPL-3.0 — no license or subscription fees.
- Bank sync is not built-in; data must be imported manually or via third-party tools, which may have their own costs.
- Optional voluntary donations are accepted via Patreon or PayPal.
- No bank transaction fees or FX markup apply because the software is self-hosted and does not connect to banks natively.
⚠ Watch for:
- No hidden fees from the software itself. Watch for external hosting/database costs if you deploy on a paid cloud provider.
- Some third-party data import tools or bank aggregation services may charge separately if you choose to use them.
🔧 Features
✓ Open Source✓ Self Hosted✓ Double Entry✓ Privacy Focus✓ No Third Party✓ Free Tier
📋 Assessment
💪 Strengths
- Complete data ownership and privacy: Firefly III is 100% open source and self-hosted, meaning no third-party service ever sees your financial data. This is a huge advantage for privacy advocates who are uncomfortable with cloud-based apps that monetize or analyze their transactions. You control backups, server location, and access, ensuring your financial history remains yours alone. This no-subscription model also means no recurring fees, making it a cost-effective long-term solution.
- Double-entry bookkeeping accuracy: Unlike most budgeting apps that use simple income/expense tracking, Firefly III uses proper double-entry accounting. Every transaction is balanced, which ensures accuracy and prevents errors. This is particularly valuable for users who want a reliable record for tax purposes or who also run a small business. The system handles transfers, splits, and multi-currency transactions with precision, giving you confidence in your financial data.
- Powerful rules engine for automation: The rules engine is a standout feature. You can create rules that automatically categorize transactions, rename payees, split transactions, or even change their budget categories based on keywords or amounts. For example, you can set a rule that all transactions with 'Amazon' in the description are marked as 'Shopping' and assigned to a specific budget. This automation saves immense time and ensures consistency, making it easy to maintain a clean financial record without manual editing.
- Piggy banks and goal tracking: Firefly III includes a 'piggy bank' feature that lets you set savings goals with a target amount and a deadline. You can allocate money to these goals from your accounts, either manually or automatically via rules. This is excellent for planning large purchases or building an emergency fund. The visual progress bars and integration with reports help you stay motivated and track your saving habits over time.
- Comprehensive reporting and multi-currency: Firefly III offers detailed financial reports, including expense reports, income vs. spending, budget reports, and category breakdowns. You can filter by date range, account, or category, and see trends over time. Multi-currency support with daily exchange rates (pulled from the European Central Bank) is a boon for those with assets in multiple currencies, allowing accurate consolidated reporting without manual conversion.
⚠ Watch out for
- No native bank synchronization: Firefly III does not connect directly to your bank. You must manually import transactions via CSV files or use third-party data importers like Spectre or GoCardless, which often require a subscription or per-data fee. This is a major inconvenience for users accustomed to automatic transaction downloads. For those with many accounts, manual imports can be time-consuming and prone to errors if your bank's CSV format is inconsistent.
- Self-hosting technical barrier: Setting up Firefly III requires significant technical knowledge. You need to install and configure a server (or use a Docker container), handle updates, ensure security measures like HTTPS and firewalls, and manage backups. This is not a plug-and-play app; it's a serious commitment. If you're not comfortable with command-line tools and server administration, the onboarding process can be daunting and error-prone.
- Steep learning curve for double-entry accounting: Firefly III uses ledger concepts like asset, expense, and revenue accounts, as well as credit/debit transactions. Users unfamiliar with double-entry bookkeeping may find the interface confusing at first. Simple concepts like 'where did the money go' are represented differently. This can lead to frustration and a higher dropout rate compared to more intuitive apps. The user manual is thorough but not a substitute for hands-on learning.
🎯 Best for
Privacy-conscious individuals who are comfortable with self-hosting and want a powerful, double-entry personal finance manager with rich automation features.
🚫 Who should skip
Non-technical users who expect automatic bank syncing, a polished mobile experience, and zero maintenance — they'd be better served by a fully managed budgeting app.
📚 Learning curve
Moderate — basic budgeting is straightforward, but mastering double-entry accounting, the rules engine, and self-hosting setup requires meaningful time and effort.
🧑⚖️ Verdict
Firefly III is a powerful, free budgeting tool for privacy advocates and tech-savvy users who value data control and are willing to invest in setup and maintenance. It excels in automation and accounting accuracy, but its lack of native bank sync and high technical barrier make it unsuitable for cas
72/100
Free tier
UK residents who want a low-effort, automated way to save spare cash and invest small amounts without leaving a single a
★ Best
💰 Pricing
🆓 Free tier available
Free tier includes core AI savings, round-ups, budgeting, bill switching, and access to investments at a higher platform fee, but lacks higher savings interest rates, reduced investment fees, priority support, and exclusive perks.
Starting at 87 Kč (freemium)
Fee notes:
- Plum Premium costs £2.99/month or £29.99/year; approx $3.80/month or $38.00/year.
- Plum Ultra costs £4.99/month or £49.99/year; approx $6.35/month or $63.50/year.
- Investment platform fee: 0.45% p.a. on Free, 0.35% p.a. on Premium, 0.25% p.a. on Ultra.
- No bank sync fees – accounts are linked via Open Banking at no cost.
- No family or couple plans; each account is priced individually.
⚠ Watch for:
- Investment fees include platform fee only; underlying fund charges (OCF) still apply.
- Plum Card may charge foreign transaction fees if used abroad – check the cardholder terms.
- Savings interest rates are variable and can change after your first year.
- Early withdrawal fees may apply if you link investments to certain providers; not for standard savings.
🔧 Features
✓ Free Tier✓ Ai Auto Save✓ Investing✓ Bill Switching✓ Uk Focus✓ Fca Regulated
📋 Assessment
💪 Strengths
- The AI-powered auto-save is intelligent: it learns your income and spending patterns and automatically moves money into savings when you can afford it. You can choose from gentle, balanced, or aggressive modes, and set a savings goal. This makes building a savings habit effortless, as the app does the heavy lifting without you having to remember to transfer funds.
- Open banking integration is smooth and secure. Plum connects to over 80 UK banks (including NatWest, Barclays, HSBC, etc.) and uses FCA-regulated providers. You can view all your accounts in one place, and Plum can also analyze your spending to offer insights (though basic insights are limited on free tier). This saves time and gives you a holistic view of your finances.
- Round-ups are simple and effective. Plum rounds up your daily purchases to the nearest pound and transfers the spare change into savings. You can also opt to 'round-up and invest' directly into a fund, making it a great way to start investing with tiny amounts. This feature is particularly appealing for beginners who want to dip their toes into the market.
- Bill comparison and switching is a practical money-saver. Plum compares your energy, broadband, and insurance providers and will switch you to a better deal, supposedly saving an average of £300-400 a year. This is proactive and helps reduce outgoings, which is a core part of budgeting. The service is included in the free tier (though switching fees may apply if you're on the free plan).
- The free tier is genuinely useful. You get access to auto-save, round-ups, basic analytics, and even a 'Plum' debit card (issued by M&S Bank) for no monthly fee. For many casual savers, this is all they need. Upgrading to Plus or Ultra adds features like cashback offers, additional interest on savings, and advanced insights, but the core value doesn't require spending a penny.
⚠ Watch out for
- Exclusively UK-only: You must have a UK bank account and be a UK resident to use the open banking integration and open a Plum account. This excludes expats, non-UK residents, or anyone with a foreign bank account. The app also isn't available on Android in some older versions? Actually, it's on both iOS and Android, but the limitation remains.
- The auto-save algorithm isn't perfect: Despite being 'smart', it can sometimes transfer more than you expect, leaving your current account lower than comfortable. However, you can set daily or weekly limits, and you can stop or pause auto-save at any time. But for those on a tight budget, it might require monitoring.
- Advanced features are paywalled: The most attractive features (higher interest rates, full analytics, investment in individual stocks) sit behind the subscription. For example, the 4.3% AER variable interest on savings (as of 2024) is only available on Plum Ultra; the free tier gets don't or a lower rate. Investing also has an annual fee (varies) which adds to the subscription cost.
- Customer support is limited: Plum primarily offers support via email and in-app chat. There's no phone support. Response times can be slow, especially during peak times. Some users report delays in resolving issues, particularly around account closure or transactions. For a money app, this can be frustrating.
- No full budgeting features: Plum excels at savings and investing, but it's not a full budgeting app. You can see how much you spend per category, but you can't create custom budgets or get detailed breakdowns like YNAB or Emma. If you want a comprehensive budgeting tool, Plum may fall short.
🎯 Best for
UK residents who want a low-effort, automated way to save spare cash and invest small amounts without leaving a single app.
🚫 Who should skip
Non-UK users, serious DIY investors, or people who need advanced budgeting controls like zero-based budgeting or custom budget categories.
📚 Learning curve
Minimal – the app guides you through linking a bank account and setting basic rules; most features can be used immediately without tutorials.
🧑⚖️ Verdict
Plum is an excellent choice for UK residents who struggle to save or want to begin investing with small amounts, thanks to its automated AI savings and user-friendly features. However, if you need a comprehensive budgeting tool, have a non-UK bank account, or prefer deep customer support, you should
📊 Use Case Suitability
Higher score = better fit. Scores from editorial review.
Use CaseFirefly IIIPlum
Personal Expense Tracking95—
Double-entry bookkeeping and detailed transaction categorization make it easy to
Saving for Financial Goals90—
The piggy bank feature allows you to allocate money toward specific savings goal
Automating Transaction Categorization85—
The powerful rules engine can automatically categorize, split, and rename transa
Privacy-Centric Financial Management80—
Because it's self-hosted, all financial data stays on your own server, making it
Automated 'set and forget' savings—95
Plum's AI analyzes spending to move safe amounts into savings automatically, mak
Round-up spare change saving—90
Plum offers round-ups on everyday purchases, letting users save micro-amounts wi
Low-effort investment for UK beginners—80
Themed funds and ETF portfolios are accessible from the app, though fees and sub
Hassle-free utility bill switching—75
Plum automates the comparison and switching of broadband, energy, and insurance
🧭 Which One Should You Pick?
Choose Firefly III if...
- You are: Privacy-conscious individuals who are comfortable with self-hosting and want a powerful, double-entry personal finance m
- 👍 100% open source with no recurring fees or subscription; you own all your financial data.
- 👍 Double-entry bookkeeping ensures every transaction is balanced and provides a highly accurate accoun
- 👍 Flexible rules engine automates transaction categorization, renaming, and splitting based on your ow
- 💰 Free tier available
- ⚠ Trade-off: No native bank synchronization; you must manually import transactions via CSV or
Choose Plum if...
- You are: UK residents who want a low-effort, automated way to save spare cash and invest small amounts without leaving a single a
- 👍 Automated AI savings that adjust to your cash flow, making it easy to save small amounts consistentl
- 👍 FCA-regulated and uses open banking, so your data and money are held under UK financial safeguards.
- 👍 A genuinely usable free tier covers core savings, bill comparisons, and some analytics.
- 💰 From $3.8/mo
- ⚠ Trade-off: UK-only: you cannot connect bank accounts outside the UK, which limits its usefu
❓ Frequently Asked Questions
Is Firefly III really free?
Yes, the software is completely free and open source under the AGPLv3 license. You will need to pay for your own server hosting and possibly a domain name, but there are no licensing fees or subscriptions.
Does Firefly III automatically sync with my bank?
No, Firefly III does not connect to banks natively. You must import transactions manually via CSV files or use third-party services like Spectre or Salt Edge through the API, which may have additional costs.
Is there a mobile app for Firefly III?
There is no official mobile app, but the web interface is responsive and works well in mobile browsers. Community-built third-party apps like Firefly III Mobile exist but are not officially supported.
What happens to my data if the project is discontinued?
Since Firefly III is self-hosted and open source, you retain full ownership of your data. You can export all your financial data at any time and continue using the existing software or migrate it to another tool.
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