I rely on the standard health app that comes with my iPhone. It is simple yet covers everything needed. You add the compound, dosage, schedule times and days, alerts, and an end date. There is also a notes area I use for cycle lengths and any dosage adjustments.
Anyone keeping a log of peptides with a daily schedule to see what was taken? Android user here who tried several apps without luck. One only handled GLP-1 compounds. Ended up with a web tool that has some glitches and sticks to UTC. The scheduler part works well for adding custom entries with amounts, times per day, and on/off periods. Completed doses get marked off. No Android app exists yet though an iOS version is available, and the site is free. Still looking for a solid Android option.