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Apps Foundry built, and the words that asked for them

The Foundry team built each app below on the live site while testing the web version, from the request shown word for word. The price is what the build charged, the time runs from pressing Build to Ready, and the tests are the build's last run in a real browser. The pictures are the apps themselves, opened at their private addresses after a few taps.

  1. Guess the Number on a phone: a dark card that says Go HIGHER than 37, a box for the next guess, a yellow Guess button and the count of 3 guesses.

    Guess the Number

    The request, as typed

    A guess the number game on one screen: the app picks a secret number, I type a guess and it says higher or lower. A settings sheet with Save and Cancel sets the highest number. When I win, a button downloads my result as a text file: guesses used and my average distance from the number.

    Size and price
    a small app, 100 tokens
    From Build to done
    28 minutes
    Tests in a real browser
    13 of 13 passed
    Check on the person’s own device
    11 of 11 passed on the device
    Built
    10 November 2026
  2. Trip Ledger on a phone: a Lisbon trip totalling $311.34 of a $1,200 budget, a doughnut chart of spending by category, and a table of lodging, food, activities and transport in US dollars.

    Trip Ledger

    The request, as typed

    A travel expense tracker that runs in your browser on one phone, with everything saved on that device and kept after the app is closed. Create trips; add expenses to a trip with a date, a category, a note, an amount and one of 10 currencies. Before a trip, set a reference rate for each currency against US dollars (rates you type in yourself, saved on the device and easy to update); every expense is then converted to USD automatically at the rate you saved. Each trip shows its total in USD and a doughnut chart of spending by category, and can be exported as a CSV file. To keep your wife's list and yours matching, use Export data / Import data: exporting produces a file or a link that carries all trips and expenses, and importing merges it into what is already on the device, so each of you can share your entries and open the same trip on your own phone. Exchange rates are not typed in by hand: when a trip is created or the app is online, the app fetches the current rates of those 10 currencies against the US dollar from a free public exchange-rate service that needs no account, shows the date of the rates it is using, stores them with the trip, and keeps working offline with the last stored rates.

    Size and price
    a big app, 300 tokens
    From Build to done
    77 minutes
    Tests in a real browser
    21 of 21 passed
    Check on the person’s own device
    19 of 21 passed on the device; the build page said 2 still failed
    Built
    10 November 2026
  3. Tic Tac Toe on a phone: a white board with X and O marks, the line O's turn above it and a Back to Home button.

    Tic Tac Toe

    The request, as typed

    A tic-tac-toe game for two players on one phone. A home screen with Play, Scores and How to play. Play shows the 3x3 board: X goes first, players take turns tapping empty squares, three in a row wins and the line is highlighted, a full board with no line is a draw. A result screen says who won or that it is a draw, with Play again and Home. Scores keeps the count of X wins, O wins and draws, saved on my phone, with a Reset button. How to play explains the rules. The Back button and the menu move between the screens.

    Size and price
    an app with lists and records, 200 tokens
    From Build to done
    39 minutes
    Tests in a real browser
    11 of 11 passed
    Check on the person’s own device
    9 of 9 passed on the device
    Built
    10 November 2026
  4. Memory Match on a phone: twelve purple cards face down on the Easy board, with the move count and a timer at the top.

    Memory Match

    The request, as typed

    A memory card matching game. A home screen with Play, High scores and How to play. Play asks for Easy (4x3 cards) or Hard (4x4 cards), then shows the board: tap two cards to turn them over, a matching pair stays face up, a pair that does not match turns back after a moment. It counts moves and time; when every pair is found it shows a You won screen with the moves and time and buttons for Play again and Home. High scores keeps the best five results for each level, saved on my phone. How to play explains the rules. The Back button and the menu move between the screens.

    Size and price
    an app with lists and records, 200 tokens
    From Build to done
    76 minutes
    Tests in a real browser
    22 of 22 passed
    Check on the person’s own device
    not done: no answer came from the device in time
    Built
    10 November 2026
  5. Currency Converter on a phone: 120 US dollars converted to 107.21 euros at the European Central Bank rate of 9 November 2026, with the conversion saved below.

    Currency Converter

    The request, as typed

    A currency converter with live exchange rates: I type an amount and pick two currencies, and it shows the converted amount at today's rate, with a small list of my last five conversions saved on this device.

    Size and price
    an app with lists and records, 200 tokens
    From Build to done
    140 minutes
    Tests in a real browser
    8 of 8 passed
    Check on the person’s own device
    not asked for
    Built
    9 November 2026
  6. Budget Book on a phone: the November 2026 dashboard with $1,581.30 of expenses, a doughnut chart of spending by category (rent, food, utilities, transport, entertainment) and the last six months below.

    Budget Book

    The request, as typed

    A budget app: accounts, categories, monthly charts of spending, and a screen to add and edit transactions.

    Size and price
    a big app, 300 tokens
    From Build to done
    103 minutes
    Tests in a real browser
    35 of 35 passed
    Check on the person’s own device
    not asked for
    Built
    4 November 2026

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