Amber

greenart7c3 | Internet

9 Downloads 11 Views v6.6 36.21 MB 4.1+

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(36.21 MB)

Editor's Overview

Amber is a internet application developed by greenart7c3, packaged as a single Android APK of version 6.6 weighing in at 36.21 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

Install Checklist

Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
File size is a light 36.21 MB, so it installs quickly even on modest connections.
This build is signed by "greenart7c3" — always verify the developer name matches what's listed on the app's official store page before installing an update.
After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

About this app

Amber is a nostr event signer for Android. It allows users to keep their nsec segregated in a single, dedicated app. The goal of Amber is to have your smartphone act as a NIP-46 signing device without any need for servers or additional hardware. "Private keys should be exposed to as few systems as possible as each system adds to the attack surface," as the rationale of said NIP states. In addition to native apps, Amber aims to support all current nostr web applications without requiring any extensions or web servers.

Details

Version	v6.6
Size	36.21 MB
Developer	greenart7c3
Category	Internet
Package	com.greenart7c3.nostrsigner
Android	4.1+
Last Updated	Oct 29, 2026
Downloads	9

Frequently Asked Questions

Is Amber free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does Amber require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is Amber safe to install?
We link to the exact APK published by greenart7c3. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update Amber?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

How to Download & Install Amber

Tap the Download APK button above and save the file to your device.
Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
Open the downloaded com.greenart7c3.nostrsigner.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «Amber» by greenart7c3 and grant only the permissions it actually needs.
Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.