Flutter Cryptography is a free, open-source set of cryptographic packages for developers who build apps with Dart and Flutter. It is aimed at programmers who need encryption, hashing, or key-handling functions in mobile, desktop, or web projects, not at people looking for a finished application to run on their computer. The code is released under the Apache License 2.0, a permissive license that allows private and commercial use under its terms.
The project is listed in our Nodes & Blockchain Clients category, which can be confusing, because it is a building block rather than a blockchain node, wallet, or miner. Windows support is available, but in practice Windows users work with the library inside a Flutter or Dart development environment. The last code update was on June 3, 2025, which falls within the past two years, so the project is reasonably recent by open-source standards. Check the repository before adopting it in a production system.
What Flutter Cryptography Is and Where It Fits
Flutter Cryptography is a library, which means it is code you include in another project rather than a program you launch. Developers add it to a Flutter or Dart app the same way they add any other package, and then call its functions from their own source files. The end result is a finished app that contains the cryptographic logic, while the library itself never appears as a separate window or service.
This distinction matters when you compare it with the other entries in our Nodes & Blockchain Clients category. A blockchain node, such as Geth or Bitcoin Core, runs continuously and connects to a network of peers. Flutter Cryptography does none of that. It supplies the mathematical building blocks an application might need, such as encryption, hashing, and key formatting.
The library is also part of the broader Dart and Flutter ecosystem. Its packages depend on the Dart language and, for mobile targets, on the Flutter framework. That dependency is the main reason most people discover it through a development workflow rather than a download page.
Who Is Flutter Cryptography For?
The primary audience is mobile and cross-platform developers who write apps in Flutter. A team building a note-taking app that encrypts data on the device before syncing it to a server is a typical example. Another is a developer who needs to sign a request or verify a token inside a client application.
Cryptocurrency projects are a natural but narrow fit. A mobile wallet interface, a portfolio tracker that stores a local API key, or a tool that displays public keys in JWK format could all use functions like these. However, a cryptographic library does not manage funds, keep a blockchain ledger, or hold a seed phrase on your behalf. Those responsibilities stay with the application you build, which is why your design and security review matter as much as the library.
Non-developers will generally not benefit from installing this package directly. If you are looking for a finished tool for everyday use, you will want one of the end-user programs or clients from the similar programs list instead.
Key Concepts Behind Cryptographic Libraries
Most cryptographic packages revolve around a few core ideas. Symmetric encryption uses one shared secret key to both encrypt and decrypt data, which is fast and suited to bulk data. Asymmetric, or public key, cryptography uses a pair of keys, one public and one private, which makes it useful for signatures and for exchanging keys over an untrusted network.
Hashing is another central concept. A hash function turns input of any size into a fixed-length digest, and small changes in the input produce very different outputs. Hashes are used to check data integrity and to store passwords safely, although the details of how they should be applied are a matter for careful design.
A few terms come up repeatedly in this category. A nonce is a value used once so that the same message encrypted twice produces different results. A key is secret material that must be generated, stored, and rotated carefully. Experienced developers avoid inventing their own algorithms, because well-reviewed implementations are far less likely to contain subtle mistakes.
Key features
Cryptography API for Dart and Flutter
Pure Dart algorithm implementations
Browser support through the Web Cryptography API
Android operating system integration
Dedicated integration test project
Cross-platform test suite
JSON Web Key encoding and decoding
How to install Flutter Cryptography on Windows
- 1
Confirm that you need a library
Flutter Cryptography is meant to be added to a Dart or Flutter project. If you want a ready-made program to run on Windows, this package will not give you one by itself. Decide first whether your project needs cryptographic functions in its source code, because that is the only situation where installing the library makes sense.
- 2
Get the code from the official source
Download the library from the official repository at github.com/planq-network/flutter_cryptography, which is the project's source code link. Use only the official website or the GitHub repository for the download, and avoid mirrors or copies shared on forums. If the project publishes a release with a checksum or signature, use that release rather than an arbitrary commit.
- 3
Verify what you downloaded
Before adding the code to your project, check the license file to confirm it is the Apache License 2.0. Compare the checksum or signature of the downloaded release with the values published by the project when they are available. Review the recent commit history, and confirm that you are looking at the expected repository and not a lookalike.
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Set up the Windows development environment
Because the library runs inside a Flutter or Dart project, install the Dart or Flutter SDK on Windows using the official installers from their respective websites. Once the SDK works in your terminal, add the package to your project's dependency file and fetch the dependencies. Then run a small test in your project to confirm that the library loads before building the rest of the app.
How to use Flutter Cryptography
Flutter Cryptography is used in code rather than through a graphical interface. The steps below describe a typical workflow for a developer working on Windows who wants to add cryptographic functions to an existing Flutter project. Adjust them to match your project's structure and your own security requirements.
- Open your Flutter or Dart project and add the Flutter Cryptography package to its dependency file.
- Fetch the dependencies from the terminal so that the library is available to your code.
- Import the cryptography API into the Dart files where you need cryptographic operations.
- Write a small function that performs one operation, such as hashing a string, and print the result to confirm the library works.
- Test the same function on each platform you support, including Android and the web build, and compare the outputs.
- Run the integration test project for the Android plugin before releasing an app that depends on it.
- Review how your app stores and handles keys, since the library does not decide where secrets live.
- Keep the package updated, and reread the release notes whenever you upgrade, because cryptographic behavior changes can affect stored data.
Treat the first few steps as a proof of concept. Once you are confident in the output, build your real feature around it and keep a record of the test results for each platform.
Pros & cons
- Free and open source under the permissive Apache License 2.0
- One API covers multiple platforms, including Android, iOS, macOS, and the web
- Pure Dart implementations make some algorithms easier to read and audit
- Browser support lets web builds use the built-in Web Cryptography API
- Includes a cross-platform test suite and an Android integration test project
- Built-in JSON Web Key encoding and decoding saves custom parsing work
- It is a developer library, not an end-user program with a graphical interface
- Using it requires programming knowledge and a Flutter or Dart development setup
- Behavior can differ between pure Dart, browser, and Android implementations, so testing is essential
- Performance of pure Dart code may be lower than native alternatives on demanding workloads
- It does not provide key storage, wallet features, or blockchain connectivity
Is Flutter Cryptography safe?
Download the library only from the official website or the GitHub repository linked by the project. Check that the license is Apache License 2.0, and compare any published checksum or signature with the downloaded file before you use it. Avoid copies from unofficial mirrors, since a modified version of a cryptographic library is a serious risk.
Do not rely on the library alone for security. Your application decides where keys are stored, how they are generated, and who can read them. Never enter a seed phrase or private key into a third-party website that claims to test or demonstrate this library. The last code update was on June 3, 2025, so the project has been maintained within the past two years, but you should still check the official repository for the current status and open issues before deploying it.
- Official source only. Download from github.com/planq-network/flutter_cryptography. 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
Most programs in the similar list are full blockchain nodes, validators, or clients. Geth, Bitcoin Core, Nethermind, Agave, and TON tools run as software that connects to a live network, stores ledger data, and takes part in consensus. Flutter Cryptography does none of this. It is a library that a mobile or web app calls for specific cryptographic functions.
This means the two kinds of software are complementary rather than direct competitors. A team building a wallet interface might use a library like this for local encryption while relying on a node client for network data. Elements / Liquid, which focuses on sidechain infrastructure, is further removed from the Flutter ecosystem. If you need a node, choose from the blockchain entries. If you need cryptographic functions inside a Flutter app, this package fits that role.
Specifications
- Price
- Free
- Type
- Open source
- License
- —
- Latest version
- —
- Last update
- 3 Jun 2025
- Windows support
- Yes (Windows build or installer)
- Source code
- github.com/planq-network/flutter_cryptography
Frequently asked questions
No. Flutter Cryptography is a library for Dart and Flutter developers, so it is used inside a project rather than launched as a separate application. Windows support means you can develop with it on a Windows computer using the Dart or Flutter SDK. If you want a finished program to run, you will need a different tool from the similar programs list.
The library is open source under the Apache License 2.0, which means its code can be reviewed publicly. Safety depends on downloading it from the official repository, verifying the release, and testing it in your own app. The library does not manage keys for you, so your application's design determines how secure the final product is.
Yes. The library is free to download and use under the Apache License 2.0. The license permits private and commercial use, subject to its terms, including the requirement to keep the license notice in redistributed copies. There are no paid tiers listed for the project itself.
The project lists macOS, Android, iOS, and web as supported platforms. Windows support is also listed as a build or installer option. Because implementations differ across targets, test your app on every platform you plan to ship, especially the Android and browser paths.
Install the Dart or Flutter SDK, add the package to your project's dependency file, and fetch the dependencies from the terminal. Then import the cryptography API into the file where you need it and run a small test. Start with one operation before building larger features around it.
No. The library provides cryptographic functions, not storage, custody, or wallet services. A wallet app built with it would still need to handle seed phrases, private keys, and backups securely. Never store funds based on a library alone without a thorough security review.
Yes. The library can encode and decode keys in the JSON Web Key format. This is useful when your app exchanges keys with web services or authentication systems that expect JWK structures. It saves you from writing a custom parser for this common format.
Verdict
Flutter Cryptography is a solid choice for developers who build Dart and Flutter apps and need cryptographic functions that run across mobile and web targets. Its Apache License 2.0 terms are permissive, the code is open for review, and the last update in June 2025 places it within the past two years. It is not a good fit for anyone looking for a finished Windows program or a blockchain node. Before adopting it, test its output on every platform you ship and check the official repository for the latest status.