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Mobile Apps

Focused Android apps for collectors, simple games, and practical everyday use. We build small, clear applications that do one job well and stay easy to understand.

George Ledger app icon

Android app

George Ledger: 1 Dollar FRN

OpenAI Build Week 2026 submission

George Ledger is a catalog and collection tracker for U.S. one-dollar Federal Reserve Notes from 1963 onward. Browse the catalog by Federal Reserve District or Series, track collection positions, and optionally maintain detailed records for individual physical banknotes. Physical specimens can include serial number, Regular or Star Note type, printing facility, grade, and personal comments. Collection statistics combine catalog progress with information about recorded physical banknotes.

George Ledger: 1 Dollar FRN feature graphic

For

Collectors of modern U.S. one-dollar Federal Reserve Notes and anyone building a set by series and Federal Reserve district.

Details

Platform
Android
Status
Available on Google Play
Category
Books & Reference
Rating
PEGI 3
Developer
Keep It Simple Software Studio
Languages
English · Ukrainian

Highlights

  • Browse by Federal Reserve District or Series
  • Track owned, graded, owned-without-grade, and missing positions
  • Optional tracking of individual physical banknotes
  • Multiple physical specimens may be recorded where supported
  • Serial number, Regular/Star type, printing facility, grade, and comments
  • Collection statistics with detailed drill-down
  • Printable PDF collection reports
  • Export/import backup and data transfer
  • English and Ukrainian interface
  • Offline collection management
View on Google Play
QR code for George Ledger on Google Play

Screenshots

George Ledger home screen with Federal Reserve districts
George Ledger series list for a Federal Reserve district
George Ledger note details and collection tracking screen
George Ledger collection statistics screen

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Thomas Ledger app icon

Android app

Thomas Ledger: 2 Dollar FRN

Thomas Ledger is a catalog and collection tracker for U.S. two-dollar Federal Reserve Notes from Series 1976 onward. Use it as a simple collection checklist or optionally maintain detailed records for individual physical banknotes, including serial number, Regular or Star Note type, printing facility, grade, and comments. Statistics combine catalog progress with physical-banknote counts and collection face value.

Thomas Ledger: 2 Dollar FRN feature graphic

For

Collectors of modern U.S. two-dollar Federal Reserve Notes and anyone building a set by series and Federal Reserve district.

Details

Platform
Android
Status
Available on Google Play
Category
Books & Reference
Rating
PEGI 3
Developer
Keep It Simple Software Studio
Languages
English · Ukrainian

Highlights

  • Browse by Federal Reserve District or Series
  • Configurable year range and Series ordering
  • Track owned, graded, owned-without-grade, and missing positions
  • Personal comments and useful reference links
  • Optional tracking of multiple physical specimens per catalog position
  • Serial number recording and Regular/Star Note identification
  • Washington and Fort Worth printing-facility information
  • Grade and comments for individual specimens
  • Statistics for catalog positions, physical banknotes, and collection face value
  • Detailed statistics with drill-down
  • Full printable PDF collection reports and separate missing-only PDF reports
  • Export/import backup and data transfer
  • English and Ukrainian interface
  • Offline collection management
View on Google Play
QR code for Thomas Ledger on Google Play

Screenshots

Thomas Ledger home screen with Federal Reserve districts
Thomas Ledger series list for a Federal Reserve district
Thomas Ledger note details and collection tracking screen
Thomas Ledger collection statistics screen

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US Small Notes Catalog app icon

Android app

US Small Notes Catalog

US Small Notes Catalog is a practical catalog and collection tracker for selected U.S. small-size paper money issued from 1928 to 1963. It covers six groups of Silver Certificates and United States Notes. Track catalog positions or optionally record individual physical banknotes, including multiple specimens for the same position, with separate type, grade, and comments.

US Small Notes Catalog feature graphic

For

Collectors of $1, $2, and $5 United States Notes and Silver Certificates with series dates from 1928 through 1963.

Details

Platform
Android
Status
Available on Google Play
Category
Books & Reference
Rating
PEGI 3
Developer
Keep It Simple Software Studio
Languages
English · Ukrainian

Highlights

  • Six catalog groups: $1, $5, and $10 Silver Certificates; $1, $2, and $5 United States Notes
  • Track owned and missing catalog positions
  • Record grades, comments, and useful reference links
  • Optional tracking of individual physical banknote specimens
  • Multiple specimens per catalog position
  • Regular and Star specimen identification
  • Expanded collection statistics and grade distribution
  • Full printable PDF collection report
  • Separate missing-only PDF report
  • JSON export/import backup and restore
  • English and Ukrainian interface
  • Offline collection management
View on Google Play
QR code for US Small Notes Catalog on Google Play

Screenshots

US Small Notes Catalog home screen
US Small Notes Catalog owned note tracking screen
US Small Notes Catalog comments with link support screen
US Small Notes Catalog collection statistics screen

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