OneThing vs Taskdan
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OneThing
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OneThing cuts through the ADHD fog and shows you one thing at a time. It's an ADHD focus & task planner. You have tasks in Google Tasks, events in Google Calendar, emails in Gmail, reminders in Apple Reminders, items in Todoist — and a brain that freezes when choosing where to start. OneThing reads all of it, scores by urgency, and hands you a single swipe card: the one thing to do right now. HOW IT WORKS Swipe right to commit and mark done. Swipe left to defer. Swipe up to delete. Swipe down to pin as your Do Now. Each swipe brings the next card — no lists, no overwhelm. WHAT YOU GET • Decision queue that merges calendar events, tasks, and emails into one prioritised stack • AI assistant you can voice-ramble to — it turns your thoughts into tasks and actions • Google Calendar, Google Tasks, and Gmail sync — see your whole day without switching apps • Apple Reminders sync • Todoist sync • Do Now mode: one thing, front and centre, for the next hour BUILT FOR ADHD No lists. No folders. No endless settings. Just one card, one choice, one tap. PRIVACY OneThing reads your calendar events, tasks, and email metadata (subject, sender, date). We never read email bodies without your explicit opt-in. Your data is never sold and never used for advertising.
Taskdan
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TaskDan is a task manager where you complete tasks by flicking cards upward into the completion zone. Instead of tapping a checkbox, send a finished task flying with your finger. TaskDan adds a satisfying physical gesture to the everyday act of getting things done. Create separate projects for work, household tasks, shopping, personal projects, or anything else. Swipe between projects and keep each set of tasks organized. Main Features ・Organize tasks by project ・Add, edit, and delete tasks ・Save a title and memo for each task ・Complete tasks with an upward flick ・Enjoy completion animations, sound, and haptic feedback ・See cards return to their original position when a flick is not completed ・Check the number of tasks completed today ・View completed tasks by date ・Undo completed tasks ・Back up your data ・Restore data from a backup file Task and project data is stored locally on your iPhone. No account registration is required, and the app can be used without an internet connection. Add a task, then flick its card upward. When the gesture has enough distance or speed, the card flies into the completion zone and the task is completed.
Screenshots
Verdict
The clearest difference is iOS requirement: OneThing at 15.1 against Taskdan's 17.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | OneThing | Taskdan |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 10 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 45 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | mirre snelting | Daisaku Mori |
In-app purchases
OneThing
No in-app purchases
Taskdan
No in-app purchases









