THE LATEST CTALK
Ready for your
next conversation.
Official downloads, current availability and release details in one place.
Get the official app.
Choose your Android download.
The main button is for 64-bit ARM Android, used by most current phones. Every build includes the same CTalk features; only the device architecture differs.
Not sure which to choose? Start with the main 64-bit download. For an older phone running 32-bit Android, choose the 32-bit version. The Intel/AMD build is for compatible Android devices and emulators, not a Windows installer.
| Android version | 1.5.4 · Build 10 |
|---|---|
| Download size | 20.7 MB (20,696,359 bytes) |
| Compatibility | 64-bit ARM Android 7.0 and later (main download) |
| Android package | buzz.ctalk.app |
| Web access | Browser linked from the Android app |
| Release date | 15 September 2026 |
Need help installing? Your workspace admin provides your User ID and password.
Faster call updates. Clearer call sounds.
The main Android download is now 20.7 MB instead of 118.5 MB—about 83% smaller. This release keeps the small downloads introduced in 1.5.2: separate device architectures, compressed native libraries and Web-only bundled fonts. No messaging, media, notification or calling code was removed.
Android uses its system fonts. Native libraries are unpacked during installation, so installed storage is larger than the download size. The existing official release signing key is retained for updates.
- User ID/password access, with no phone number or email required.
- Admin-created client and manager accounts, assignments and password recovery.
- Multiple workspaces with super-admin creation or approval.
- Encrypted text, photos, videos, documents and voice notes.
- Replies, reactions, forwarding, stars, edits and delivery/read receipts.
- Media previews and downloads, plus Delete for me and Delete for everyone.
- Groups and cross-workspace group invitations.
- Android message notifications with reply and Mark as read actions.
- QR-linked browser sessions and device revocation.
Version 1.5.4 adds separate incoming ringtone and outgoing ringback sounds. Decline and hangup updates interrupt pending call setup immediately, stop call audio and release the microphone. Unanswered and declined incoming calls appear as missed calls. Android Silent, vibration and Do Not Disturb settings remain in control.
This update retains the faster account setup and chat loading from 1.5.3. Automated validation includes 41 Flutter tests, 33 backend checks and a native Android test in which a remote decline arrived in 52 milliseconds while the relay was deliberately unreachable. This is a local test result, not a delivery-time guarantee for every network.
The public audio/video relay still requires a hosting network configuration step. See the availability table below before using calls. The official signing key is unchanged, so this release updates an existing official installation.
What's available today?
| Feature | Availability |
|---|---|
| Android app | Available as a direct APK download |
| Web messaging | Available after QR linking from Android |
| Chat, media & voice notes | Available |
| Groups & workspace management | Available, subject to account permissions |
| One-to-one audio/video calls | Being enabled; not ready on this hosted release |
| Group calls | Not supported |
| iOS app / App Store | Not available |
Network access, device permissions and battery settings affect delivery. The service is currently a testing deployment; these checks don't constitute an independent security audit or a high-load capacity guarantee.
Check the file you downloaded.
Download only from the official button on this site. For an additional check, compare the APK's SHA-256 checksum using a trusted file-checksum tool on your device.
Main APK SHA-256 · 64-bit ARM
32-bit Android APK SHA-256
Intel/AMD Android APK SHA-256
Signing certificate SHA-256
Older debug builds use a different signing identity. See the installation guide before replacing one.
Download the checksum file