Compare who can reach the plaintext and influence updates—not just the cipher names.
An encrypted web messenger is not automatically unsafe, and a native Android app is not automatically safe. Both can implement end-to-end encryption; both must handle plaintext on the user's device. The meaningful comparison is who can influence the client, read the displayed content or obtain access to its keys.
Using the same named algorithms does not prove that two clients have identical implementations or security. For Livara, the published security architecture describes the intended protection. This article compares platform trust boundaries, not the result of an independent audit of either client.
The differences worth checking
| Surface | Web client | Android client |
|---|---|---|
| Code delivery | Site code, dependencies, browser cache and update behaviour | Installed package and its update channel |
| Extra software | Extensions with relevant permissions, injected site code | Accessibility services, keyboards and other privileged software |
| Storage | Browser profile and origin-scoped storage | App storage, OS controls and backup configuration |
| Physical access | Unlocked browser session and shared computer | Unlocked phone and active app session |
| Integrity checks | Trust in site delivery and browser security | Package signatures and, where available, trusted release hashes |
These are different attack surfaces, not a universal ranking. A well-maintained dedicated browser may be a better choice than an outdated phone with hostile software installed.
Can extensions read encrypted chat messages?
An extension with the appropriate site access can use a content script to read or change page content. Chrome's content-script documentation explains that these scripts interact with the page's DOM. If a message is rendered there as readable text, an authorised script may be able to access it without breaking the message encryption.
Extensions commonly have an isolated JavaScript environment, but that does not isolate the page's visible DOM from them. Conversely, it is incorrect to say that any unrelated website in the same browser profile can automatically read another site's chat. Browser origin boundaries still matter; crossing them requires an allowed interaction, vulnerability or other access.
Review extension site access and remove unnecessary extensions. A separate profile with minimal extensions can reduce exposure, but it does not cure a compromised operating system or unsafe site code.
What WebCrypto does—and does not—provide
The W3C Web Cryptography specification exposes cryptographic operations to web applications. It does not certify the protocol assembled from them or make hostile script harmless.
A non-extractable key restricts ordinary export of key material through the API. Code with appropriate access may still use that key for permitted operations or read the resulting plaintext. Non-extractability is therefore not a complete defence against a compromised application environment. Algorithm availability also depends on browser implementation; support should be checked rather than assumed from a specification name.
For users, the practical questions are whether the browser and OS are updated, whether the origin is correct, what extensions can access the site, and how the app handles persistent keys and logout.
Does fresh web code always mean the latest fix?
No. Web delivery can make updates quick, but caching, service workers and long-lived tabs can affect which code is running. It also means trusting the site's code-delivery process. An installed app has its own risks: delayed updates, compromised signing or distribution, and unsupported OS versions.
Keep both client types updated through their official channels. Do not assume a page reload proves a security patch was applied, or that a package signature proves the application has no vulnerabilities.
How to check an Android download
Android's package signatures and a published file hash answer different questions. The official apksigner documentation describes signature verification. A SHA-256 comparison can tell you whether a downloaded file matches a particular reference, but the reference must itself be trusted.
If an attacker controls both the APK and the displayed checksum, matching them does not establish authenticity. Hashing a file also does not prove reproducible builds, absence of malicious behaviour or correctness of its cryptography. Livara's threat model acknowledges this trusted-reference limitation.
Do not sideload a replacement merely because a blog calls native apps safer. Confirm the official distribution route and the exact version you intend to install.
A platform decision checklist
- Shared computer? Avoid leaving a private chat session open; check saved sessions and logout behaviour.
- Many extensions? Reduce site access or use a clean profile for sensitive work.
- Managed device? Understand the organisation's management and monitoring policy before using personal accounts.
- Untrusted Android services? Review accessibility, notification, keyboard and remote-support access without disabling assistive tools you need indiscriminately.
- Long-lived history? Understand how keys and backups survive browser-storage cleanup or app reinstall before deleting anything.
- High-risk conversation? Verify the contact through an independent trusted path and consider the security of both participants' devices.
For the broader decision, use the secure-messenger checklist. Neither platform choice removes recipient-side copying, malicious-device access or the metadata a service retains.
Frequently asked questions
Does a browser extension need to break encryption?
Not if it has access to plaintext already displayed in the page. Relevant permissions and browser protections determine that access.
Is the Android app always the safer choice?
No. Device condition, update support, installation source and privileged software matter. Compare the environment you actually have.
Does a matching checksum prove a secure build?
It proves equality with the reference hash under the hash function's assumptions. It does not establish whether the reference is authentic or the code is safe.
