Hither

Hither turns any App Store link or app ID into one short link (hither.link/<app id>) that sends each visitor to your app's page in their own country's App Store. If your app isn't sold in their country, it falls back to the US store or another large store that has it. iPhone and iPad visitors see a small page with your app's icon and a button, so they never hit Apple's "not available" message. No account needed, links never expire, and you can make your link before launch. It's open source under the MIT license (https://github.com/wisteenio/hither) and runs on Cloudflare's free plan, so you can also deploy your own copy.