Guitar Tuna is an excellent app with minimal distractions, simple and intuitive ui, and lets you calibrate, which can be invaluable. Tunes down to A1 with exce

Guitar Tuna is an excellent app with minimal distractions, simple and intuitive ui, and lets you calibrate, which can be invaluable. Tunes down to A1 with excellent bass presets. There are ads in the free version, and removing them / unlocking extras costs $12.99 . Best way to filter apps I've found is to look for three things: domain appropriate pricing, high numbers of good (believable) reviews, and a lifetime greater than 12 months. Very few crapware apps have all three at once - it also helps to ask relevant communities on enthusiast forums when it comes to craft - I've found great bubble level recommendations from a woodworking forum. Going to Twitter or social media comes in third, it's tough to get a good signal noise ratio from the hordes. Eventually ai might be able to curate for quality, but having multiple social proxies can help in the meantime.