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

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.

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.