Backlink Checker is a link monitoring tool that monitors your backlinks & informs you if your backlinks are removed. We charge users in subscription plans or lifetime access to monitor their backlinks.

Volume Booster helps you make quiet videos and audio files louder directly on your iPhone or iPad. | About 3,000 downloads a month from App Store search. We have never spent money on ads. | No servers, no backend and no monthly costs. Everything runs on the device. | Fully localized in 32 languages, with prices set per country. | Downloads come from App Store search ORGANIC. No ads

walldecor.io lets anyone preview wall decor on a photo of their own room before buying. The main hook is the free Wall Art Visualizer: upload a photo, drop in any artwork, and see it framed at its real size on your wall. The paid Lifetime plan ($29) adds wall repainting, wallpaper, and full room makeovers.