# 100 Small Web App Ideas

A hundred little apps you can build just by describing them to an AI like Claude, no coding required. Each one is a single page that runs in a web browser. They are grouped into ten themes, and every idea is tagged by how much work it takes to build.

This pairs well with the "Building with AI" workshop: pick any idea, describe it, and refine it.

## Difficulty legend

- **(easy)**: one screen, works right away, nothing is saved.
- **(medium)**: remembers your information in the browser between visits.
- **(hard)**: saves or shares data with other people (uses a small database).

## How to build any of these

Give Claude the five-part recipe: who it is for, what it should do, a few details, how it should look, and then "build it." Start with an easy one, then change and add things until it feels right.

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## 1. Everyday utilities

1. **Bill and tip splitter**: split a restaurant bill and the tip among friends. (easy)
2. **Unit converter**: switch between length, weight, temperature, and volume. (easy)
3. **Countdown to any date**: show the days left until an event you choose. (easy)
4. **Decision spinner**: type in options and let a wheel pick one. (easy)
5. **QR code maker**: turn a link or note into a scannable code. (easy)
6. **Multi-timer**: run several labeled timers at once (laundry, parking, tea). (easy)
7. **Passphrase generator**: create strong, memorable passwords and rate them. (easy)
8. **Discount calculator**: work out a sale price and how much you saved. (easy)
9. **Timezone meeting helper**: find a good time across a few cities. (medium)
10. **Text tidy tool**: fix capitals and strip out extra spaces or line breaks. (easy)

## 2. Home, kitchen, and garden

11. **Recipe box**: save, search, and scale your favorite recipes. (medium)
12. **Dinner picker**: choose a random meal from your own list. (easy)
13. **Pantry tracker**: log what is in the cupboard and flag what expires soon. (medium)
14. **Aisle-sorted grocery list**: add items and group them by store section. (medium)
15. **Weekly meal planner**: slot meals into each day and build a shopping list. (medium)
16. **Plant watering log**: track when each plant was last watered. (medium)
17. **Planting calendar**: see what to sow or plant by season. (medium)
18. **Home upkeep reminders**: nudge for filters, smoke-alarm batteries, and gutters. (medium)
19. **Cost-per-serving calculator**: price a recipe and divide by portions. (medium)
20. **Use-it-up helper**: suggest meals from ingredients you already have. (medium)

## 3. Health, fitness, and wellness

21. **Water tracker**: tap to log glasses and see your daily total. (easy)
22. **Walk log**: record daily steps or minutes with a weekly chart. (medium)
23. **Habit tracker**: check off a few daily habits and keep a streak. (medium)
24. **Medication schedule**: list doses and when to take them. (medium)
25. **Mood journal**: note how you feel each day and watch the trend. (medium)
26. **Routine timer**: run a stretch or exercise routine with timed steps. (easy)
27. **Sleep log**: record bedtime, wake time, and how you slept. (medium)
28. **Breathing guide**: follow an animated box-breathing pattern. (easy)
29. **Gratitude journal**: jot one good thing a day. (medium)
30. **Heart-rate zone calculator**: work out target zones from your age. (easy)

## 4. Money and budgeting

31. **Budget snapshot**: compare a month's income against spending. (medium)
32. **Expense tracker**: log purchases by category and total them. (medium)
33. **Savings goal**: set a target and watch a progress bar fill. (medium)
34. **Loan calculator**: estimate monthly payments on a loan or mortgage. (easy)
35. **Savings projector**: see how a monthly amount grows over years. (easy)
36. **Subscription tracker**: list what you pay each month and the yearly total. (medium)
37. **Travel currency converter**: convert amounts for a country you pick. (medium)
38. **Group expense splitter**: track a trip's costs and who owes whom. (medium)
39. **Allowance tracker**: log pocket money in and out for a child. (medium)
40. **Cost-per-use calculator**: decide whether a purchase is worth it. (easy)

## 5. Travel and the outdoors

41. **Packing checklist**: a reusable list that remembers what you tick. (medium)
42. **Trip itinerary**: plan each day of a trip with times and notes. (medium)
43. **Trip countdown**: count down to your next trip with a favorite photo. (easy)
44. **Daily travel spend**: log expenses against a trip budget. (medium)
45. **Jet-lag helper**: compare home and destination time at a glance. (easy)
46. **Bucket list**: tick off places and experiences you want. (medium)
47. **Hiking log**: record trails, distance, and how they went. (medium)
48. **What-to-wear helper**: paste a forecast and get an outfit suggestion. (easy)
49. **Road-trip planner**: map out stops and build a playlist. (medium)
50. **Gift and souvenir list**: track what to buy for each person. (medium)

## 6. Family, kids, and pets

51. **Family trivia quiz**: test how well everyone knows each other. (easy)
52. **Chore chart**: assign tasks and award stars or points. (medium)
53. **Reward tracker**: save up points toward a treat. (medium)
54. **Pet care log**: track feeding, walks, and vet dates. (medium)
55. **Baby tracker**: note feeds and naps through the day. (medium)
56. **Reading log for kids**: log books read and unlock stickers. (medium)
57. **Shared family recipes**: a collection everyone can add to. (hard)
58. **Birthday and event board**: keep the family's important dates. (medium)
59. **Chore-of-the-day picker**: randomly assign the day's job. (easy)
60. **Grandkids' art gallery**: upload drawings with captions. (medium)

## 7. Productivity and organizing

61. **To-do list**: tasks with priorities and a "done" view. (medium)
62. **Daily planner**: block out your day hour by hour. (medium)
63. **Focus timer**: a Pomodoro clock with work and break rounds. (easy)
64. **Sticky-note board**: pin quick notes you can rearrange. (medium)
65. **Reading list**: keep track of what you want to read next. (medium)
66. **Bookmark dashboard**: your favorite links on one tidy page. (medium)
67. **Meeting notes template**: an agenda and notes layout you reuse. (easy)
68. **Decision matrix**: score options against criteria to compare them. (medium)
69. **Weekly review checklist**: run through the same questions each week. (easy)
70. **Keep-in-touch reminder**: nudge you on who to call or message. (medium)

## 8. Learning, memory, and language

71. **Flashcards**: study cards that resurface the ones you miss. (medium)
72. **Math practice**: timed drills for kids (times tables and more). (medium)
73. **Word a day**: build vocabulary with a new word each visit. (medium)
74. **Typing speed test**: measure words per minute and accuracy. (easy)
75. **Quiz maker**: write your own questions, then take the quiz. (medium)
76. **Travel phrasebook**: handy phrases for a language you pick. (easy)
77. **Memory match**: flip cards to find pairs and beat your time. (easy)
78. **Study timer**: focus sessions with reminders to take breaks. (easy)
79. **Explain-it-simply playground**: ask an AI to explain any topic plainly. (hard)
80. **On this day**: show facts or events for today's date. (medium)

## 9. Hobbies, making, and creativity

81. **Book and film log**: rate and review what you read and watch. (medium)
82. **Tasting journal**: notes and scores for wine, coffee, or beer. (medium)
83. **Craft project tracker**: follow progress on knitting or other makes. (medium)
84. **Photo gallery**: a simple grid of pictures with captions. (medium)
85. **Quote of the day**: show a fresh quote or poem each visit. (easy)
86. **Color palette maker**: generate color schemes for a project. (easy)
87. **Doodle pad**: a blank canvas to sketch in the browser. (easy)
88. **Practice log**: track instrument practice by piece and minutes. (medium)
89. **Collection catalog**: list a collection (stamps, coins, records). (medium)
90. **Story prompt generator**: spark ideas for writers. (easy)

## 10. Games, quizzes, and just-for-fun

91. **Word ladder puzzle**: change one letter at a time to reach a target word. (medium)
92. **Number guessing game**: guess the hidden number with hot-or-cold hints. (easy)
93. **Trivia game**: answer questions and keep score. (medium)
94. **Dice and card roller**: rolls and draws for board-game night. (easy)
95. **Would you rather**: a deck of fun either-or questions. (easy)
96. **Bingo card maker**: generate cards for the screen or printing. (easy)
97. **Rock paper scissors**: play against the computer. (easy)
98. **Affirmation generator**: a kind message at the press of a button. (easy)
99. **Tic-tac-toe**: classic noughts and crosses versus a friend or the computer. (medium)
100. **Magic 8-ball**: shake for a playful answer to any question. (easy)

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*100 ideas, grouped into 10 themes. To build one, describe it to Claude and refine from there. Start easy.*