To-Do List
An online to-do list for making simple checklists. Items are auto-saved in this browser only and never sent to a server.
No tasks yet. Add one above.
How to use
- Select a list and enter a task, due date, repeat schedule, and priority.
- Use Today, Open, and Done views to quickly find the tasks you need.
- Uncheck a completed task to restore it; recurring tasks automatically create the next occurrence.
- Reorder tasks with the up/down buttons or Alt+arrow keys, and back them up to a file.
Frequently asked questions
Is the list saved on a server?
No. Items are saved only in this browser (localStorage) and are never sent to a server.
Do I need to log in?
No. You can use it as soon as you open the page, and your list stays when you return.
Does it sync across devices?
Syncing isn't supported. It saves only in the browser you used.
Practical example and verification criteria
To-Do List: First distinguish whether you need calculation, recording, timing, audio, or a screen check, then set units, intervals, repetitions, volume, and storage options for the real environment. Locally saved data may exist only in the current browser and device and can disappear when browser data is cleared, private mode is used, or the device changes.
To-Do List: For a quick check, start with 3 tasks − 1 complete → 2 as a small input whose result relationship you can verify directly. Confirm that the input summary, units, and options match your intent before applying the tool to real values or a copy of the source; this reduces setup mistakes.
To-Do List: Before relying on a timer or alert, test sound, volume, screen lock, and background behavior over a short interval, and also register important schedules in an operating-system alarm. Reopen exported files to verify saved results. Audio and screen results depend on hearing, ambient light, and device settings and do not replace professional measurement or long-term storage.
To-Do List · Work record: For real work, record the input conditions, selected options, and result together. Do not assume the same state will remain after a refresh or device change. Preserve important results separately using copy, download, a screenshot, or another method the page supports, then reopen them in the target environment.
To-Do List · Error check: If an error or unexpected result appears, reduce the input, run again with default options, and then change one condition at a time. Recording error messages and boundary values helps distinguish format issues, unsupported cases, and browser resource limits, and prevents an empty result from being mistaken for success.
To-Do List · Scope of use: Check the page guidance for browser processing versus server lookup, storage location, and supported scope. Use sensitive source material or secrets only when strictly necessary. High-impact work such as legal, financial, or medical decisions or changes to an operational system requires current authoritative information and a separate verification process.