Decluttering before a move is the single highest-leverage thing you can do to lower moving costs, because movers charge by weight and volume. The best decluttering apps do not just help you sell; some haul items away, some handle donation receipts, and some turn resale into a chore you can finish in an evening. Here is how the leading options stack up when your goal is owning less before you pack a single box.
Use MovePlan to decide what goes before you touch a listing, then pick your channel: Gone or ThredUp for hands-off selling, Facebook Marketplace and OfferUp for volume, and Decluttr for tech. The less you own on moving day, the smaller your moving bill.