Quote Calculator
Let a visitor answer a few questions and get an honest price estimate on the spot.
What it adds
A guided question flow that produces a priced estimate from server-held rules, with a saved copy for follow-up.
What your agent is told to do
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What your agent is told to do
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Build the question flow on the app's existing Multi-Step Form and Conditional Form Fields rather than a new one-off wizard. Showing and hiding questions based on earlier answers is exactly what conditional fields already do.
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Keep every rate, multiplier, minimum, and discount on the server. The browser sends answers and receives a priced breakdown; it never holds the price list and never does the arithmetic that produces the total.
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Show the estimate as itemised lines with a total, not a single number. A visitor who can see which answer added which cost will trust the figure and will adjust an answer instead of leaving.
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State the estimate's status plainly next to it: what it includes, what it excludes, how long it holds, and that it is an estimate rather than a quote. Reuse the app's Number Formatting Component so currency matches the rest of the product.
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Do not let the calculator become a pricing admin tool as well. Ship it reading rules that an operator edits in one defined place, and defer a visual rule builder until the pricing model has actually stopped changing.
Edge cases it handles
8
Edge cases it handles
8- Changing an earlier answer must recompute the whole estimate from scratch, not patch the previous total. Incremental adjustment accumulates error and leaves stale line items attached to answers the visitor has since changed.
- Rounding each line item and then summing gives a different total than summing and rounding once. Pick one rule, apply it in a single place, and make sure the displayed lines add up to the displayed total exactly.
- Some answer combinations genuinely cannot be priced to a single figure. Return a range with the reason rather than a falsely precise number, and make the range visibly a range so nobody quotes the lower bound back to you.
- Pricing rules held in the browser can be read and edited by anyone who opens the developer tools. Keep them server-side and treat any price arriving from the client as untrusted input to be recomputed, never as a value to store.
- Most visitors abandon partway. Save partial answers against the session so returning resumes where they stopped, and if an email has been captured, keep the partial estimate retrievable for follow-up.
- An estimate the visitor saw must remain reproducible after the rates change. Store the rule version alongside each saved estimate so a follow-up conversation is about the same numbers the visitor was shown.
- A calculator that emails or stores results is a spam target. Apply the app's existing Rate Limiting to submissions and validate the email before sending anything to it.
- Free-text and open numeric inputs invite absurd values. Clamp them server-side to a sane range and explain the limit rather than producing an estimate of several million.
Definition of done
9
Definition of done
9- A visitor completes the questions and receives an itemised estimate with a total.
- All pricing rules and arithmetic execute on the server; no rates are present in client code.
- Editing an earlier answer recomputes the full estimate and the visible lines sum exactly to the total.
- Under-specified inputs produce a labelled range rather than a single figure.
- Partial answers survive abandonment and resume on return.
- Every saved estimate records the pricing version used to produce it.
- Submissions are rate limited and out-of-range inputs are rejected with an explanation.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
Link Shortener
Link Shortener
Turn long URLs into short branded links and see how many people actually clicked.
What it does
A short-link service with custom or generated slugs, a redirect endpoint, and per-link click counts.
How it works
- 1 The app already has Shareable Deep Links and Signed Share Links. Extend that machinery with a short-slug alias rather than standing up a second, parallel link table that will drift out of sync with it.
- 2 Let a user accept a generated slug or type their own. Validate a custom slug on the server against reserved application routes, existing slugs, and profanity, and say which rule failed rather than silently generating a different one.
- 3 Record a click on the redirect itself: timestamp, referrer, coarse device type, and coarse location. Feed those into the app's existing Event Tracking so the numbers appear beside the rest of the analytics instead of in an isolated counter.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/link-shortener
Social Proof Notifications
Social Proof Notifications
Show visitors that other people are genuinely signing up and buying, without inventing it.
What it does
A small recurring toast on public pages announcing recent, real signup or purchase activity.
How it works
- 1 Draw every message from real records the app already stores. Never seed the queue with sample or placeholder activity, and never fabricate a purchase that did not happen.
- 2 Render the toast through the app's existing Toast Notifications region rather than adding a second floating layer, so stacking, dismissal, and screen reader announcement already behave correctly.
- 3 Reduce each event to the least identifying form that still reads as real: a first name or initial, a region no finer than country or state, and a relative time.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/social-proof-notifications
Waitlist
Waitlist
Capture demand before you're ready to open the doors.
What it does
An email capture that gates access and lets you admit people in batches.
How it works
- 1 Add an email capture on the landing page, storing entries with a timestamp and source.
- 2 Give yourself an admin way to admit people, individually or in batches.
- 3 Send an email when someone is admitted, with a unique access link.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/waitlist
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.