Deltiology Postmark

Deltiology Postmark is an offline-first register for postcard collectors. Record every topographical view card and greetings card with its publisher, postmark date and view location, then browse your collection as a beautiful album. It is a cataloguing tool, built for people who want an accurate, permanent record of what they own. All entries are typed in by hand, and the artwork on each tile is generated from your card data, so the app needs no photos, camera, location or contacts access. ALBUM GRID Open straight into a fullscreen album of postcard tiles. Each tile has a cream border, a stamp corner and a circular postmark overlay showing the postmark year. Switch between the Topographical, Greetings, Real Photo and Unsorted tabs, and choose 2, 3 or 4 columns to suit your screen. FAST CARD ENTRY Add a card with publisher (with autocomplete from your existing publishers), series or card number, view location (country, region, town), card type, postmark date, stamp denomination, condition grade, posted or unposted status, and notes. POSTMARK TIMELINE See your cards grouped by postmark decade and year, with a separate bucket for undated cards and a year strip to filter with one tap. PUBLISHER SHELF Browse publishers with card counts and active year ranges. Open a publisher to see a grid of all of its cards and follow a publisher run at a glance. LOCATION INDEX Explore a country, region and town tree with counts. Search by town name or card caption. CARD DETAIL View a large tile of the front with an address-side style info panel. Edit, duplicate, favorite or delete a card, with an undo option if you change your mind. DUPLICATES AND GAPS Cards that share publisher, series number and view are flagged as duplicates. Missing numbers in a publisher series appear as empty ghost tiles, so you can see what to hunt for next. WANTLIST Keep a typed list of the cards you are looking for. When you find one, mark it found and convert it into a collection card in one tap. COLLECTION STATS See your total cards, a cards-per-decade bar chart, top publishers, top locations, your oldest postmark and your most-represented town. BACKUP AND EXPORT Export your register as CSV or JSON and import it again using the system file picker. A home screen widget shows a random Card of the Day, and an optional weekly reminder nudges you to catalogue new finds. PRIVATE BY DESIGN No account, no sign-in and no permissions. Your collection stays on your device. Theme, grid density and sort order are remembered between sessions. Whether you collect local views, seaside greetings or real photo cards, Deltiology Postmark helps you keep your collection organized.

Initial production release of Deltiology Postmark. First release: browse your postcards in a fullscreen Album Grid with 2, 3 or 4 columns. Add cards with publisher, postmark date and view location. Find duplicates and gaps, track a wantlist, view stats, and export or import your register as CSV or JSON. Deltiology Postmark is an offline-first register for postcard collectors. Record every topographical view card and greetings card with its publisher, postmark date and vi…