No. Your app makes one HTTPS request and compares two numbers. The docs have code for Swift, Kotlin, Flutter and React Native.

Which plan do I need?

Pro or Team, the plans with channels.

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Testers stop testing last week's build

Pro and Team

The link and the email reach testers once. After that, many keep the build they have and report bugs you fixed days ago. With the update check, the test build itself notices when its channel has a newer build and offers the install link.

It is one public JSON address per channel and a few lines in your app. Nothing to add to your build system, no SDK to keep up to date.

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Example

Beta channel, Android

Installed on the phoneBuild 116
Newest in the channelBuild 118
Your app showsUpdate available

GET /api/c/<channel>/latest?platform=android

Made for

Teams that ship a test build every day or two
Agencies whose client testers forget to check their email
Apps tested in the field, where the QR code was scanned once

What it ends

Bug reports against builds that are already fixed
Asking testers which version they are on
Sending the same link again after every build

How it works

Step 1
Put builds into a channel
For example Beta, from the dashboard or CI. The channel always knows its newest build per platform.
Step 2
Add the snippet
Copy the Swift, Kotlin, Flutter or React Native code from the docs, with your channel address from Projects, Testing, Update check.
Step 3
Testers get the prompt
When the channel has a higher build number, your app shows your own message and opens the install page.

What the app reads

The channel answers with the version, the build number (iOS CFBundleVersion, Android versionCode), release notes, the install link and when the build went in. Put an older build back into the channel and apps see that one, so a rollback reaches testers too. Release notes stay hidden for password protected builds.

Good to know

Keep the check out of store builds entirely: compile it only into a beta flavor or configuration. App Store guideline 2.5.2 and Google Play's policy on self updating apps do not allow it there, even as unused code.
On iPhone the new build must include the tester's device, as with any ad hoc build.
The app shows the prompt and opens the link; installing stays a tap by the tester.

Questions

Is there an SDK?: No. Your app makes one HTTPS request and compares two numbers. The docs have code for Swift, Kotlin, Flutter and React Native.
Which plan do I need?: Pro or Team, the plans with channels.