How can we help?

Home Screen: touch and hold an empty spot, tap Edit, then Add Widget, and search for Stepglow. Swipe to pick a size.
Lock Screen: touch and hold the Lock Screen, tap Customize, then Lock Screen, and tap the area under the clock (or the date above it).

iOS decides how often widgets can refresh, usually every 15 minutes or so. The app itself counts live while it's open, and opening it also refreshes your widgets.

Stepglow combines Apple Health (which includes your Apple Watch) with your iPhone's motion sensor, and shows whichever count is higher. Health can take a little while to catch up, so Stepglow is sometimes ahead of it.

No. Your iPhone counts steps on its own. If you wear an Apple Watch, its steps are included through Apple Health.

Every day you reach your goal adds one to your streak. A day below your goal ends it. Today never breaks your streak while it's still in progress. Changing your goal only affects today onward, so past days keep the goal they had.

Shortly after you hit your goal, usually within 15 minutes to an hour, depending on when iOS next lets Stepglow check in. If the app is open, you'll see the celebration right away instead.

Check that Stepglow has permission in Settings → Privacy & Security → Health → Stepglow and Settings → Privacy & Security → Motion & Fitness. You can also tap the ⓘ button in the app and choose Show Intro Again to go through setup once more.