For finance enthusiasts, accountants, and small business owners alike, diving deep into your financial data can unlock critical insights. While many cloud‐based solutions offer convenience, nothing beats the control and privacy of hosting your own finance app. Better yet, if these apps export easily into Excel (or CSV formats that Excel happily ingests), you can unleash powerful analysis through pivot tables, charts, and custom formulas. Below, we explore five self‑hosted finance apps that not only put you in full control of your data but also export perfectly into Excel for detailed, further analysis.

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5
Firefly III
Arguably, the best open-source financial tool
Firefly III is a robust personal finance manager designed for meticulous budgeting, expense tracking, and investment monitoring. However, its best quality is that it can be self-hosted, and that translates into perfect privacy and security. You can use it to record incomes, expenses, and set up budgets with detailed categorization. Then, you can learn about your spending trends through charts and graphs.
And, if you were wondering, Firefly III allows you to export your data as CSV files, which you can open directly in Excel. Needless to say, after you get your information in Excel, you can forward analyze and enrich it by using formulas and pivot tables.

4
Akaunting
Perfect for small businesses and low budgets
Akaunting is a free online accounting software designed for small businesses. That means handling budgets without spending a dime on the software is possible. It has a modern and clean UI, and you have all the accounting features you need, including invoicing, expense tracking, and cash flow management. Better yet, Akaunting has multi-currency support, so you can also handle international transactions. If your business grows, you can expand the software with add-ons.

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However, most importantly, you can self-host it on your server or in the cloud. Regarding the Excel integration, you can export all reports and transaction histories in CSV or XLSX format.

3
ERPNext
ERPNext is a full‑featured ERP system that includes a pretty powerful accounting module. So, it’s perfect if you want to integrate finance with other core functions like inventory, HR, and sales.
The only problem is that the accounting part is not stand-alone. The financial data is automatically updated when you process invoices, manage payments, or handle purchase orders. However, you can export Excel files (as CSV or XLSX files) for every relevant financial event.
The best part is that you can get the source code from GitHub and self-host ERPNext on your own server. This way, you will have full control over your data.

2
LedgerSMB
Great for midsize businesses
Like any other open-source tool, LedgerSMB is community‑driven software. It’s an accounting and ERP solution designed for small to midsize businesses, with a modular architecture. Users praise it for its rigorous double-entry bookkeeping and comprehensive financial reporting.
You can self-host it, and that will help you modify both the business logic and presentation layers. For instance, if you need custom fields or specialized workflow modifications, you can change the code to fit your needs. Also, being in control of your own server means you can integrate LedgerSMB with other tools in your IT ecosystem, such as CRM systems, inventory management, and even HR tools.

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Moreover, LedgerSMB has reporting modules that allow you to export financial data in CSV format. Once exported, you can open them in Excel to use pivot tables and advanced charting for layered analysis and reporting.

1
Invoice Ninja
Small but powerful
Invoice Ninja originally started as a tool for invoicing but has grown into a full-blown expense and finance management solution for freelancers and small businesses. You can easily use it to create, send, and manage professional invoices, but you may also record and classify expenses and link them to specific projects or clients.
Like all the tools I mentioned above, Invoice Ninja can export data such as invoice histories, payment logs, or expense records in CSV or XLSX formats.
The great advantage of Invoice Ninja is that it allows you to schedule regular exports of your financial data. Then, you can integrate this with Excel’s Power Query to create a workflow where your financial spreadsheet updates automatically. And if you self-host Invoice Ninja, you ensure that everything remains on your server, far from prying eyes.

In-house financial data for your eyes only
Self-hosting your finance app means more than just keeping your financial data off third‑party servers; it means getting complete control over your data and the freedom to push it into Excel for any deeper analysis you can imagine.
If you’re eager to customize the analysis even further, you should also look into Excel’s advanced features like Power Query and Power BI integrations to turn raw data into dynamic, real‑time dashboards.