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.
About mygems
mygems makes small apps that do heavy work: a CSV viewer and editor that open files with hundreds of thousands of rows, a JSON editor, an AI mind map, a habit tracker and a video trimmer. Next to them are free CSV tools that run in your browser, and guides on the problems the apps were built to solve.
The guides are written by the people who build the apps. When a guide compares one of our apps with others, it says so, and holds ours to the same standard as the rest.
The apps
Video Trim, Flip, ReverseOne video in, five tools, one export.Read more
JSON Editor: Smart JsonOne JSON document, three views that all edit.Read more
Mind Map: Smart MindAI mind maps that never leave your device.Read more
CSV Editor - Smart CSVOpens the CSV files other apps choke on.Read more
CSV File Viewer - Smart CSVRead, query and chart any CSV. AI assistant included.Read more
Habit Tracker: 30Day ChallengeAny goal, turned into a 30-day challenge.Read more
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.