Fennel App is a free, open-source crypto tool for Windows users who want a ready-made desktop program instead of building software from source. It sits in the Other Crypto Tools category, so it is a utility rather than a wallet or exchange client. It is best suited to people who are comfortable checking software before they run it.
Keep the project's age in mind. Its latest code update is dated May 10, 2023, which means the project is more than two years old and may not receive fixes or compatibility updates. Treat it as a tool to evaluate carefully rather than a set-and-forget choice. The sections below cover what the program is built with, who may benefit from it, how to install it, and how to check it before use.
What Fennel App Is Built With
Fennel App is written in JavaScript and TypeScript, two languages widely used for web and desktop interfaces. The project uses Electron, a framework that packages web-style user interfaces into a desktop application. Electron bundles a browser engine and a runtime, so the same front-end code can run as a standalone Windows program.
The project was bootstrapped with Create React App, a starter template that sets up a React project with a standard folder layout and build scripts. Starter templates like this save time at the beginning, but they also mean the codebase may carry generic configuration that the original author did not fully customize. When reviewing the code, look at which parts are project-specific and which come from the template.
Who Fennel App Is For
Fennel App is most relevant to Windows users who work with crypto tooling and want a free, open-source option. Developers who read JavaScript or TypeScript can study how an Electron-based crypto utility is structured. Students and hobbyists can use the code as a learning resource for desktop application design.
It is less suitable for users who need a tool with regular updates and active support. Because the last code update dates to May 2023, anyone relying on the program for ongoing work should plan for the possibility of compatibility issues or unpatched bugs. Ask yourself whether you need a finished product or a project you can examine and adapt.
Why Open Source Matters for Crypto Tools
Open-source software lets anyone inspect the code that runs on their computer. For crypto tools, this matters because a program may handle addresses, keys or transaction data, and readable code makes it easier for independent reviewers to spot problems. Public code history also shows how often a project changes and how quickly issues are addressed.
Open source does not guarantee safety by itself. Reading code takes time and skill, and many users never do it. A practical middle ground is to check the repository's commit history, look at open issues, and confirm that the file you download matches the published build before you install it.
Key features
Published Source Code
Ready-Made Windows Build
How to install Fennel App on Windows
- 1
Get the File from a Trusted Source
Download Fennel App from the project's official website or from the GitHub repository linked to the source code. If the repository publishes a Releases page with a Windows build or installer, use that file. Avoid mirror sites and file-sharing links, since they can contain modified copies.
- 2
Verify the Download
Compute the SHA-256 checksum of the file using PowerShell with the Get-FileHash command, then compare the result with the checksum published alongside the release. If the project provides a digital signature, check it through the file's Properties dialog. Do not run the installer if the values do not match.
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Run the Installer
Double-click the installer and follow the on-screen prompts. Choose an install location you can easily find and remember. If Windows SmartScreen or your antivirus warns about an unknown publisher, pause and recheck the checksum before deciding whether to proceed.
How to use Fennel App
Fennel App is a desktop utility, so the workflow depends on what you need the program to do. The steps below apply to a standard first run after a verified installation.
- Launch the program from the Start menu or desktop shortcut and wait for the main window to load.
- Look for an about, help or settings screen and note the version number, so you can compare it with the release notes on GitHub.
- Review the program's on-screen options before entering any data, and make sure you understand what each one affects.
- Test with harmless input first, so you can see how the program responds before using it for anything important.
- Keep a record of the version you installed and the checksum you verified, so you can confirm future downloads.
- Close the program when you finish, and remove it if you no longer need it.
Pros & cons
- Free to use
- Open-source code that can be read and reviewed
- Windows build or installer available, so no development setup is required
- Built with widely used web technologies such as JavaScript, TypeScript and Electron
- Last code update dated May 10, 2023, so the project is more than two years old
- Uncertain long-term support and compatibility with newer Windows releases
- Open source requires you to check code or trust the published build
Is Fennel App safe?
Fennel App is a crypto-related tool, so treat it with the same caution as any software that may touch sensitive data. Download it only from the official website or the project's GitHub repository, and verify the SHA-256 checksum or digital signature before running the installer. Never enter a seed phrase, private key or wallet password into a third-party website or a program you have not verified.
The project's last code update is more than two years old, which raises the risk of unpatched bugs. Use it on a computer you control, keep Windows and your antivirus up to date, and avoid running it on a machine that holds funds you cannot afford to lose.
- Official source only. Download from github.com/fennellabs/fennel-app. Ignore ads and lookalike domains.
- Check the SHA-256. Compare the installer hash with the value the developer publishes before running it.
- Never share your seed phrase. No developer, support agent or website — including CryptApps — will ever ask for it.
Alternatives
Fennel App shares the crypto tooling category with other titles on this site, but its focus is different. PSBT Commander is a Rust-based PSBT creator built on BDK, aimed at people who build Bitcoin partially signed transactions. Dumplings is a CoinJoin analysis project by Ádám Ficsór, known as nopara73. Related IOHK Address Lib may contain address-handling logic that is useful for specific networks.
Fennel App is a general Windows-oriented utility built with Electron. It is best compared with alternatives by checking its code, purpose and maintenance record against your own task rather than by comparing feature lists.
Specifications
- Price
- Free
- Type
- Open source
- License
- —
- Latest version
- —
- Last update
- 10 May 2023
- Windows support
- Yes (Windows build or installer)
- Source code
- github.com/fennellabs/fennel-app
Frequently asked questions
Yes, Fennel App is free. Its source code is published openly on GitHub, and a Windows build or installer is available for download. Check the project's repository for any license terms before reusing or modifying the code.
It can be, if you take basic precautions. Obtain the file from the official website or the project's GitHub repository, verify the SHA-256 checksum, and avoid mirror sites. Because the code has not been updated since May 2023, run it only on a computer where you can accept some risk.
No. Node.js, npm and other build tools are needed to compile the project from source. The ready-made Windows build or installer does not require them, so you can install and run the program without a development environment.
The most recent code update is dated May 10, 2023, so there is no sign of recent development in the public code history. Check the GitHub repository's commit history and open issues to see whether maintainers respond to reports before relying on the program.
No. Fennel App belongs to the Other Crypto Tools category rather than wallets. Wallets store keys and sign transactions, which requires a stricter security review. If you need to hold funds or send transactions, use a wallet designed for that purpose and review its security record first.
Other titles in this catalog serve different tasks. PSBT Commander focuses on creating Bitcoin partially signed transactions, while Dumplings is built for CoinJoin analysis. Match the tool to the specific job you need done, rather than choosing based on category alone.
Verdict
Fennel App suits Windows users and developers who want a free, open-source crypto utility and are comfortable verifying downloads and reading code. It is a weaker choice for anyone who needs a regularly updated tool, since its last code update dates to May 2023. Before installing, check the latest version on the official website and review the project's GitHub activity, then decide whether the risk fits your needs.