About

Manual list management in spreadsheets or plain text files introduces formatting errors, lost items, and version confusion. This tool provides structured list creation with persistent storage, drag-and-drop reordering, and deterministic export to 5 output formats. Each item supports a checked/unchecked state and one of 8 color categories for visual grouping. All data persists in your browser's LocalStorage. The tool approximates a lightweight database with O(n) lookup and O(1) insertion. Note: LocalStorage is capped at roughly 5 MB per origin, so extremely large lists (over 10,000 items) may approach that limit.

Pro Tip: Use color categories to separate priority tiers before exporting. The export function preserves item order exactly as displayed, so drag items into your desired sequence first. Checked items can be filtered out or kept depending on your workflow. For collaborative use, export as JSON and share the file.

Formulas

Item storage uses a flat array structure where each element is an object with 4 properties. The total storage size S in bytes can be estimated:

S ≈ n × (36 + L + 12) bytes

Where n = number of items, 36 = UUID length in characters, L = average text length per item, and 12 = overhead for color string and boolean flag. For a list of 500 items averaging 80 characters each: S ≈ 500 × 128 = 64,000 bytes ≈ 62.5 KB. Well within the 5 MB LocalStorage cap.

Drag-and-drop reordering uses an index-swap operation. When item at index i is dropped at position j, the array performs a splice-insert:

splice(i, 1) → splice(j, 0, item)

This preserves all other item positions with O(n) complexity per operation.

Reference Data

Feature	Description	Limit
Items per list	Maximum individual entries in a single list	500
Characters per item	Maximum text length for each list entry	200
Saved lists	Maximum number of named lists in storage	50
Color categories	Distinct color dots for visual grouping	8
Export: Plain Text	One item per line, no formatting	.txt
Export: Numbered	Prefixed with 1. 2. 3. etc.	.txt
Export: Bulleted	Prefixed with • bullet character	.txt
Export: CSV	Comma-separated with headers: Index, Text, Color, Checked	.csv
Export: JSON	Structured array of item objects	.json
Drag & Drop	Reorder items by dragging the handle	All items
Bulk actions	Check all, uncheck all, delete checked, delete all	Per list
Duplicate detection	Optional warning when adding duplicate text	Case-insensitive
LocalStorage key	Data stored under prefixed key per list name	5 MB total
Import	Paste text (one item per line) or upload JSON	Same limits apply

Frequently Asked Questions

All lists are stored in LocalStorage, which is deleted when you clear browsing data. Export critical lists as JSON files before clearing cache. JSON export preserves all item metadata including colors and checked states, allowing full restoration via the import function.

Export one list as JSON, then switch to the target list and use the Import function to append those items. The import operation adds items to the end of the current list without overwriting existing entries. Duplicate detection will warn you if any imported items match existing text.

In Plain Text, Numbered, and Bulleted exports, color data is not included since these are plain text formats. CSV export includes a Color column with the hex value. JSON export preserves the full color property per item. If you need color information, use CSV or JSON format.

The tool enforces a limit of 50 named lists to prevent LocalStorage overflow. Each list can hold up to 500 items. If you need more capacity, export completed lists as JSON files and delete them from storage to free space.

The tool implements touch-based reordering using long-press on the drag handle followed by vertical dragging. On devices where native HTML5 drag-and-drop is unsupported, the tool falls back to move-up and move-down buttons that appear on each item for reliable reordering.

Duplicate detection performs a case-insensitive comparison of the new item text against all existing items in the current list. When a match is found, a warning toast appears but the item is still added. This is intentional: some lists legitimately contain repeated entries. The warning is informational only.