TestFairy might be a bit more popular than Apptim. We know about 1 link to it since March 2021 and only 1 link to Apptim. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Apptim — A mobile testing tool that enables people without performance engineering skills to evaluate an app's performance and user experience (UX). A desktop version using your own device is 100% FREE, with unlimited tests on both iOS and Android. - Source: dev.to / 3 months ago
Https://testfairy.com is also an alternative solution. You can have users and groups to share the apk. Source: almost 2 years ago
TestApp.io - A platform that helps both mobile app developers and owners to easily share their apps with everyone to get feedback before reaching publicly to Google and App stores.
TestFlight - iOS beta testing on the fly.
AppHost - Free iOS and Android (IPA and APK) app hosting for enterprise and internal mobile apps.
AWS Device Farm - Improve the quality of your iOS, Android, and web applications by testing against real mobile devices in the AWS Cloud.
Visual Studio App Center - Continuous everything – build, test, deploy, engage, repeat
Appforshare.io - Extended Expiry | Extended Size | Extended Storage