Number Formatting Component
Format every count, percentage, and total the same way, without rounding away meaning.
What it adds
One shared path for displaying numeric values, covering precision, abbreviation, locale separators, and the values that are not numbers.
What your agent is told to do
5
What your agent is told to do
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1
Find every numeric value the app renders — counts, totals, percentages, durations, file sizes, ratios — and give each a declared type so the display rules follow from what the number is rather than from where it appears.
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Set precision per type and never abbreviate a value the user must act on. A summary tile can say 1.2k, but a quantity someone is about to reconcile or pay must show in full.
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Keep the exact value available even where a shortened one is displayed, on hover and to assistive technology, so a rounded figure can always be checked.
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Format separators, decimal marks, and percentage placement from the viewer's locale rather than hardcoding a convention, and align numeric columns on the decimal so magnitudes can be compared down a column.
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Do not sort or filter on the formatted string. An abbreviated or separated value sorts as text, which puts 9 after 1.2k; keep the raw number for every comparison and use the formatted form only for display.
Edge cases it handles
7
Edge cases it handles
7- Rounding must not change what the number means. A 99.6 per cent success rate displayed as 100 per cent hides every failure, so round toward the honest side for values where the difference matters.
- The value used for sorting, filtering, and thresholds must be the raw number, never the rendered string.
- Separators and decimal marks differ by locale — the same characters mean opposite things in different regions — so they must come from the viewer's locale rather than the developer's.
- Null, infinity, not-a-number, and negative zero each need a defined rendering. A missing value shown as 0 is a false statement about the data, and negative zero must display as zero.
- Very large and very small values need a defined ceiling and floor rather than an unbounded string that breaks the column width.
- A percentage must be unambiguous about whether it is already scaled; a ratio of 0.5 rendered as 0.5 per cent is a hundredfold error.
- Dates, times, and durations expressed as timestamps belong to Date and Time Display Component; this component owns quantities only.
Definition of done
9
Definition of done
9- Every numeric display in the app goes through the shared formatting path with a declared value type.
- Precision and abbreviation rules are defined per type and applied consistently.
- Sorting, filtering, and comparison always use the raw value, never the formatted string.
- Separators and decimal marks follow the viewer's locale.
- Null, infinity, not-a-number, and negative zero each render a defined state.
- The exact value is reachable wherever an abbreviated or rounded one is shown.
- Numeric columns align on the decimal point.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
Feedback Widget
Feedback Widget
Let anyone report a bug or send a comment from the page they are looking at.
What it does
An always-available launcher that opens a short feedback form and submits it with page context attached.
How it works
- 1 Put a single persistent launcher in one corner of the app and open a compact form in place. Do not route the user to a separate feedback page and lose the context they were about to describe.
- 2 Attach the current URL, the app version, the viewport size, the signed-in account, and a short trail of recent client errors automatically, so the reporter does not have to describe where they were.
- 3 Show the captured context to the user before they send it, in a collapsible section, and let them remove it. Silent collection of screen state is a trust problem.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/feedback-widget
Interactive Transcript
Interactive Transcript
Put the transcript next to the player so clicking any line jumps playback to that moment.
What it does
A time-aligned transcript panel beside the audio or video player, with click-to-seek, a moving highlight, and in-transcript search.
How it works
- 1 Render the transcript from the timestamps the app already stores. If Voice Transcription exists, extend its output and its data model rather than producing a second transcript with its own timings.
- 2 Make every line a real seek target: clicking or pressing enter on a line moves playback to that time and keeps focus where the user left it.
- 3 Highlight the line currently being spoken and keep it in view as playback advances, using the player's own time updates rather than a separate timer.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/interactive-transcript
Reschedule and Cancel Links
Reschedule and Cancel Links
Give every booking confirmation a link the person can use to move or cancel it.
What it does
Tokenised self-service links in booking confirmations and reminders that let the attendee change or cancel without signing in.
How it works
- 1 Put the two links in the booking confirmation, in every reminder, and on the confirmation screen itself. A person looking for the link is usually looking in the last message they received.
- 2 Land the link on a page that restates the booking in plain terms before offering any action, so someone who opened it by accident can see what they are about to change and back out.
- 3 Reuse the app's existing Signed Share Links mechanism for token generation, expiry, and revocation rather than inventing a second token scheme. If the app has Magic Link Sign-In, note that this link grants access to one booking only and must never establish a full session.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/reschedule-and-cancel-links
How it works
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1
Copy the link
Grab the Markdown instruction URL for this feature.
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2
Give it to your AI
Paste it into Claude Code, Cursor, v0, Lovable — whatever you build with.
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3
It inspects, then implements
Your agent reads your existing app first, then adds the feature to fit it.
Works with your stack
These instructions are written to adapt. They tell the agent to detect your framework, match your existing design system, and reuse what you already have — rather than assuming a particular stack.
Need it tighter than that? Customize the feature and tell it exactly what you're running.