Get Apple TestFlight: Download the official, free TestFlight app from the App Store on your iPad. TestFlight is Apple's official platform for distributing pre-release software securely. Make sure your device is updated to modern system software (iOS 27+, iPadOS 27+, macOS 27+, watchOS 27+, or visionOS 27+).
Tap "Join Beta" on CodeWing: Return to this page and tap the Join Beta button above. Safari will trigger the official TestFlight invitation link. If prompted with "Open in TestFlight?", tap Open.
Accept Developer Invitation: TestFlight will launch and display the latest build notes and tester information for Delta Chat. Tap Accept to register your Apple Account into the beta testing group.
Install & Start Testing: Tap Install (or Update) to download the build directly to your device. You'll receive instant notifications inside TestFlight whenever merlinux GmbH pushes new builds, bug fixes, or feature updates.
Essential Beta Testing Tips:
Apple 10,000 Tester Cap: Apple limits public TestFlight groups to 10,000 active users. If slots are currently full, tap Get Slot Alerts above to be notified the second a slot opens.
100% Free Sandbox Purchases: In-app purchases, subscriptions, and pro features in TestFlight are simulated in Apple's sandbox environment at $0.00 — your Apple Account is never billed.
90-Day Build Lifespan: Each build expires after 90 days. Developers periodically push updates that reset the countdown, and your personal app data is preserved.
Revert to App Store Anytime: You can switch back to the public release at any time by redownloading Delta Chat directly from the regular App Store.
About Delta Chat
Delta Chat is a reliable decentralized instant messenger that is easy and fun to use for friends, family, groups and organizations. Delta Chat is developed by a dedicated FOSS contributor community that jointly releases refinements and new features several times a year, across many stores and platforms world-wide.
Features at a glance:
Private. Instant on-boarding without a phone number or other private data.
Friends & Family: Only chat with people you know. Unknown users cannot message or follow you without mutual consent.
Flexible. Supports multiple chat profiles and is easy to setup on multiple devices.
Reliable. Works under bad and adversarial network conditions.
Secure. Audited End-to-End encryption safe against network and server attacks.
Sovereign. Can be run with your own e-mail address or server.
FOSS. Fully Open Source/Free Software, built on Internet Standards.
How do I join the Delta Chat TestFlight beta on iPadOS?
First, download Apple's official TestFlight app from the App Store on your iPad. Then return to this page and tap the "Join Beta" button above. Your device will automatically open TestFlight and prompt you to accept the developer's beta invitation. Tap "Accept" and then "Install" to start testing Delta Chat. If it says "This beta is full", tap "Get Slot Alerts" to be notified instantly when a slot opens.
Is testing Delta Chat on TestFlight safe and free?
Yes, testing Delta Chat is 100% safe and free. Every public TestFlight build must strictly follow Apple's App Review Guidelines and passes Apple's automated and manual security checks before public invitation links can be distributed. All betas operate within Apple's secure operating system sandbox and cannot access your device data without explicit permission. The beta is developed and maintained by merlinux GmbH.
Do in-app purchases or subscriptions cost real money during TestFlight beta testing?
No. In TestFlight, Apple connects all transactions to its free Sandbox environment. Any in-app purchase, pro feature tier, or subscription inside Delta Chat will display "[Environment: Sandbox]" and costs $0.00. Your Apple Account or credit card will never be billed for purchases made within a TestFlight beta build.
Does Delta Chat support iPadOS 27, Stage Manager, Split View, and Apple Pencil?
Yes, Delta Chat is fully optimized for iPadOS 27 and iPadOS 26. It supports modern iPad multitasking features including Stage Manager, Split View, Slide Over, and Apple Pencil precision input across iPad Pro, iPad Air, iPad mini, and standard iPad models.
What should I do if the Delta Chat TestFlight beta says "This beta is full"?
Apple enforces a strict cap of 10,000 public testers per TestFlight app. Popular betas fill up quickly, but spots reopen regularly because Apple automatically purges inactive testers, and merlinux GmbH frequently clears inactive seats before dropping new beta builds. Tap the "Get Slot Alerts" button on this page to receive instant Email and Telegram alerts from CodeWing the moment an open slot is detected. You can also discover trending alternatives in the Social Networking category.
Will installing the beta replace my current App Store version of Delta Chat, and will I lose my data?
Installing the TestFlight beta will replace the App Store version on your iPad, but all your local app data, documents, logins, and configurations are safely preserved. If you ever want to switch back to the stable public release, you can simply redownload Delta Chat directly from the App Store at any time without losing your data.
How long does a TestFlight beta build last before it expires?
Each TestFlight build has a maximum lifespan of 90 days from the day the developer uploaded it to Apple. You can see the countdown days directly beneath Delta Chat's title in your TestFlight app. Developers regularly release new builds with improvements, which automatically resets the 90-day timer so your testing is uninterrupted.
How do I send feedback or report bugs for Delta Chat?
You can send feedback directly to merlinux GmbH by taking a screenshot while using Delta Chat and tapping "Share Beta Feedback", or by opening TestFlight, tapping Delta Chat, and selecting "Send Beta Feedback". You can include notes, screenshots, and system logs to help the developer fix issues before the official App Store launch.
