Fast on real data
Not demo data. A 500,000-row CSV opens on a phone, scrolls without stutter, and sorts without a spinner. If it can't hold up on the real file, it doesn't ship.
4 apps, one standard
Small apps that do the heavy work.
Small enough to open in a second. Heavy enough for half a million rows. No ads, no accounts, no tracking — and everything you make exports.
mygems — catalogue
$ mygems list --what-it-does
smart-mind ai mind maps that never leave your device
csv-editor opens the csv files other apps choke on
csv-viewer read, query and chart any csv — ai assistan…
habit-tracker build habits on paper you can't lose
$ mygems list --what-it-costs-you
ads none
accounts none
analytics none
your data stays on the device, exports on request
The standard
Different jobs, same three rules.
Honest about what's free
No ads, no accounts, no analytics, no upsell theatre. What you make stays on your device — nothing is uploaded, synced, or read by anything.
Nothing gets trapped
PDF, PNG, Markdown, OPML, CSV, plain text. Importing is always free, so a backup taken today still opens on another device years from now.
The catalogue
Four apps, so far.
Each one started as a file that wouldn't open, a note that wouldn't stay put, or a habit that wouldn't stick.
Mind Map: Smart Mind
AI mind maps that never leave your device.
- AI generate & expand
- 8 layouts, 18 themes
- PDF, PNG, Markdown, OPML
- No ads, no account
Smart Mind is a fast, private mind mapping app for capturing ideas, planning projects, studying and thinking out loud. Everything you write stays on your device — no ads, no account, no tracking.
START WITH AI, FINISH BY HAND
Describe what you're thinking about in one sentence and Smart Mind builds a structured map from it. Tap any topic to expand it into sub-topics. AI topics arrive as ordinary editable text — nothing is locked or watermarked, and undo works normally.
BUILT FOR REAL MAPS
- Unlimited topics on an unlimited canvas that grows with your thinking.
- Several mind maps side by side on one page.
- Drag and drop to re-parent a topic or re-order siblings.
- Checkboxes with progress that rolls up from the branch below.
- Auto-numbering, crosslinks between any two topics, labels and call-outs.
- Images from camera or gallery, notes on any topic, emoji and stock icons.
- Collapse, hide branches, autofocus one branch, branch and group borders.
- Editable outline view — type a list, see a map.
- Search in a map and across your library, organised into folders.
LAYOUTS AND STYLE
Eight layouts: horizontal, vertical, top-down org chart, linear timeline, radial, matrix, list, and free-form. Eighteen built-in themes, eight of them dark. Style any topic — fill, text, border, shape, font — and any branch line's colour and pattern.
TAKE IT ANYWHERE
Export to PDF, PNG, HTML, Markdown, OPML or plain text outline. Print from the app. Present a map branch by branch as an animated slideshow. Back up everything to one file and restore it on another device — importing is always free, so your maps are never trapped.
PRIVACY, PLAINLY
No ads. No account. No analytics. No tracking. Your maps live on your device and are never uploaded, synced or read by anything.
Read the full description
START WITH AI, FINISH BY HAND
Describe what you're thinking about in one sentence and Smart Mind builds a structured map from it. Tap any topic to expand it into sub-topics. AI topics arrive as ordinary editable text — nothing is locked or watermarked, and undo works normally.
BUILT FOR REAL MAPS
- Unlimited topics on an unlimited canvas that grows with your thinking.
- Several mind maps side by side on one page.
- Drag and drop to re-parent a topic or re-order siblings.
- Checkboxes with progress that rolls up from the branch below.
- Auto-numbering, crosslinks between any two topics, labels and call-outs.
- Images from camera or gallery, notes on any topic, emoji and stock icons.
- Collapse, hide branches, autofocus one branch, branch and group borders.
- Editable outline view — type a list, see a map.
- Search in a map and across your library, organised into folders.
LAYOUTS AND STYLE
Eight layouts: horizontal, vertical, top-down org chart, linear timeline, radial, matrix, list, and free-form. Eighteen built-in themes, eight of them dark. Style any topic — fill, text, border, shape, font — and any branch line's colour and pattern.
TAKE IT ANYWHERE
Export to PDF, PNG, HTML, Markdown, OPML or plain text outline. Print from the app. Present a map branch by branch as an animated slideshow. Back up everything to one file and restore it on another device — importing is always free, so your maps are never trapped.
PRIVACY, PLAINLY
No ads. No account. No analytics. No tracking. Your maps live on your device and are never uploaded, synced or read by anything.
Google PlayiOS — in review
CSV Editor - Smart CSV
Opens the CSV files other apps choke on.
- 500,000+ rows
- Excel-style sort & filter
- Formula columns
- Charts in two taps
CSV Editor - Smart CSV opens the CSV files other apps choke on. Files with hundreds of thousands of rows open in seconds, scroll smoothly, and edit like a real spreadsheet — complete with formulas — right on your iPhone or iPad.
EDIT LIKE A SPREADSHEET
- Tap to select, tap again to edit — Excel-style on touch.
- Insert, delete, and reorder rows and columns.
- Undo and redo everything.
- Freeze rows and columns so headers stay put while you scroll.
- Select ranges with drag handles, clear whole ranges at once.
BUILT FOR BIG FILES
- Opens 500,000+ row files without slowing down.
- Background loading with live progress — start reading immediately.
- Smooth flick-scrolling through the whole sheet.
SORT & FILTER
- Excel-style AutoFilter per column.
- Sort text, numbers, and dates the way Excel does.
- Filtered rows are protected: edits and deletes never touch hidden data.
CHARTS
- Turn any selection into a chart in two taps.
- Bar, line, and more.
- Save chart images to your photo library or share them.
FORMULA COLUMNS
- Add a computed column that fills down every row, like a spreadsheet formula.
- Reference other columns by name — e.g. [Price] * [Qty].
- Built-in functions: IF, ROUND, ABS, MIN, MAX, CONCAT, UPPER, LOWER, TRIM, LEN, CONTAINS.
- Live preview and inline error checking while you build the formula.
- Formulas save inside the CSV, so results are readable in any app.
SMART FORMAT HANDLING
- Auto-detects delimiters, headers, and encodings.
- Opens TSV and other delimited files.
- Re-open with custom parse settings when a file is unusual.
Your files are never truncated: even in the free version, every row of your file is preserved when you save.
Read the full description
EDIT LIKE A SPREADSHEET
- Tap to select, tap again to edit — Excel-style on touch.
- Insert, delete, and reorder rows and columns.
- Undo and redo everything.
- Freeze rows and columns so headers stay put while you scroll.
- Select ranges with drag handles, clear whole ranges at once.
BUILT FOR BIG FILES
- Opens 500,000+ row files without slowing down.
- Background loading with live progress — start reading immediately.
- Smooth flick-scrolling through the whole sheet.
SORT & FILTER
- Excel-style AutoFilter per column.
- Sort text, numbers, and dates the way Excel does.
- Filtered rows are protected: edits and deletes never touch hidden data.
CHARTS
- Turn any selection into a chart in two taps.
- Bar, line, and more.
- Save chart images to your photo library or share them.
FORMULA COLUMNS
- Add a computed column that fills down every row, like a spreadsheet formula.
- Reference other columns by name — e.g. [Price] * [Qty].
- Built-in functions: IF, ROUND, ABS, MIN, MAX, CONCAT, UPPER, LOWER, TRIM, LEN, CONTAINS.
- Live preview and inline error checking while you build the formula.
- Formulas save inside the CSV, so results are readable in any app.
SMART FORMAT HANDLING
- Auto-detects delimiters, headers, and encodings.
- Opens TSV and other delimited files.
- Re-open with custom parse settings when a file is unusual.
Your files are never truncated: even in the free version, every row of your file is preserved when you save.
CSV File Viewer - Smart CSV
Read, query and chart any CSV — AI assistant included.
- AI assistant
- SQL queries
- Visual filters
- Chart & PDF export
Effortlessly explore CSV: AI assistant, PDF/chart, filter, SQL queries, and more.
More than a basic csv reader, it's your comprehensive CSV file explorer. Uncover all this with Smart CSV Viewer:
- Easy to view your CSV file.
- Use AI Assistant to query CSV content.
- Show column image URL as an image.
- Analyzing your data is easy by using visual filters or SQL queries.
- Easy filter data with Visual Filter Editor.
- Generate a chart image.
- Convert to PDF file. A CSV file can be custom data and style to export to a pdf file as you want.
- Manage all the exported files and share them with your friends.
- Easy to search your content.
- Copy the selected rows.
- Support both csv & tsv file format.
- Files open instantly after import, even those of large size.
- and more.
Read the full description
More than a basic csv reader, it's your comprehensive CSV file explorer. Uncover all this with Smart CSV Viewer:
- Easy to view your CSV file.
- Use AI Assistant to query CSV content.
- Show column image URL as an image.
- Analyzing your data is easy by using visual filters or SQL queries.
- Easy filter data with Visual Filter Editor.
- Generate a chart image.
- Convert to PDF file. A CSV file can be custom data and style to export to a pdf file as you want.
- Manage all the exported files and share them with your friends.
- Easy to search your content.
- Copy the selected rows.
- Support both csv & tsv file format.
- Files open instantly after import, even those of large size.
- and more.
Habit Tracker: 30Day Challenge
Build habits on paper you can't lose.
- Hand-drawn interface
- No ads, no reminders
- Drag to reorder
- Streak statistics
Effortlessly track habits, build a better life: Simple and easy.
Welcome to our Habit Tracker app, your companion for effortlessly cultivating new habits. With its intuitive hand-drawn interface, simplicity is key - no notifications, reminders, distractions, or ads to disrupt your focus.
CREATE HABITS
Craft concise and memorable habit names for easy recall. Personalize your experience further by customizing the background paper style to suit your taste.
TRACK YOUR HABIT
Track your progress at your convenience, whether it's a quick check-in during idle moments or a nightly reflection before bed. By integrating seamlessly into your routine, habits become ingrained effortlessly.
ORDER HABIT
Take control of your habits' sequence with ease. Simply navigate to settings, reorder, and rearrange them to your preference with a simple drag-and-drop interface.
STATISTICS
Stay informed with insightful statistics on your habit-building journey. Track your progress by monitoring the number of completed days for each habit.
HABITS INTEGRATED INTO YOUR LIFE
Once a habit becomes second nature, effortlessly remove it from your list to make space for new ones. It's all about continuous growth and improvement.
Embark on your habit-building journey today and unlock your full potential. Let's embark on a journey of continuous improvement, building habits to craft a lifestyle of enduring success!
Read the full description
Welcome to our Habit Tracker app, your companion for effortlessly cultivating new habits. With its intuitive hand-drawn interface, simplicity is key - no notifications, reminders, distractions, or ads to disrupt your focus.
CREATE HABITS
Craft concise and memorable habit names for easy recall. Personalize your experience further by customizing the background paper style to suit your taste.
TRACK YOUR HABIT
Track your progress at your convenience, whether it's a quick check-in during idle moments or a nightly reflection before bed. By integrating seamlessly into your routine, habits become ingrained effortlessly.
ORDER HABIT
Take control of your habits' sequence with ease. Simply navigate to settings, reorder, and rearrange them to your preference with a simple drag-and-drop interface.
STATISTICS
Stay informed with insightful statistics on your habit-building journey. Track your progress by monitoring the number of completed days for each habit.
HABITS INTEGRATED INTO YOUR LIFE
Once a habit becomes second nature, effortlessly remove it from your list to make space for new ones. It's all about continuous growth and improvement.
Embark on your habit-building journey today and unlock your full potential. Let's embark on a journey of continuous improvement, building habits to craft a lifestyle of enduring success!
Found a rough edge? Tell me about it.
One person builds these, and every bug report lands in the same inbox. Feature requests too — plenty of what shipped started as an email from someone using the app on a file I'd never have thought to test.