Every printer has a slightly different feed offset. Open Settings → Calibration, print the test page on a sheet of regular paper, measure how far off the cross-hair is, and enter the offset. Once calibrated, every future print on that printer is aligned.
Yes — all seven Avery templates are supported with per-cell selection. Tap the cells you want to print, leave the rest blank.
Posthaste centres the measured address block (the printed text dimensions, not the bounding box) by default — so multi-line and single-line addresses look identically balanced. If you want a non-centred layout, the Customize Layout feature in Pro lets you drag the block anywhere, with snap-to-centre and snap-to-corner guides.
There is nothing to cancel. Posthaste Pro is a one-time $1.99 in-app purchase, not a subscription. There's no recurring charge and no account to close.
On the new device, open Settings → Pro → Restore Purchases. As long as you're signed into the same Apple ID, the purchase comes right back. Family Sharing is also enabled, so anyone in your family can use Pro on their own device at no extra cost.
Bulk tab → CSV file → pick the file. Posthaste auto-maps the standard TCGplayer and eBay column names. For other spreadsheets, the column-mapper appears so you can pick which columns are name, street, city, state, and ZIP.
Yes — entirely on-device. The only network use is AirPrint discovering your printer over Wi-Fi (which is a local network, not the internet).
Not in 1.0. iCloud sync arrives in 1.1. Until then, each device keeps its own list locally.
Uninstall Posthaste. Because everything is stored on-device, removing the app removes the data. Or use Settings → Reset Local Data inside the app.
Initial release. Eleven envelope sizes, seven Avery sheet templates, twelve single-label sizes, smart paste, 3D preview, AirPrint and PDF, bulk import from screenshot or CSV, custom layouts, sender logo, per-printer calibration.