Build a useful free tool to attract customers
Use a coding assistant to build a small free tool that solves a recurring audience problem and introduces your main product.
How this works
Use a coding assistant to build a small free tool that solves a recurring audience problem and introduces your main product. A useful free tool gives the audience a small, immediate result that relates naturally to the main product. Its value must stand on its own; collecting contact details is not a substitute for solving the stated task.
Define one bounded transformation, implement it in a simple interface, and test the result with representative and invalid inputs. Use an available coding assistant within the existing project conventions. Keep lead capture optional where the brief allows and explain what data leaves the browser before integrating external services.
Before you start
Audience problem
Choose a recurring task with an observable result, such as a checklist or a bounded calculator.
Calculation or decision rules
Obtain the authoritative formulas or rubric; do not ask a model to invent business rules.
Product handoff
Define the relevant next action and any approved contact-capture requirement.
Prepare the inputs
- tool_brief
- Required
Problem and user journey
Keep the scope to one useful job.
- input_schema
- Required
Field definitions
Specify types, ranges, required fields, and examples.
- result_rules
- Required
Formulas or rubric
Separate deterministic calculations from generated explanation.
- brand_context
- Required
Approved UI guidance
Use available assets without inventing product claims.
- integration_scope
- Required
Allowed destinations
Identify whether the prototype may store leads or only show results.
Implementation, step by step
Specify the useful result
- Write examples of what a user enters and what a successful output looks like.
- Identify the smallest version that answers the question without login, payment, or unrelated features.
Checkpoint: A bounded acceptance brief.
Design the input contract
- Choose clear labels, defaults, validation messages, and an empty-state explanation.
- Keep unknown values distinct from zero and avoid requiring irrelevant personal details.
Checkpoint: A form specification with valid and invalid examples.
Implement the transformation
- Use deterministic code for arithmetic and explicit rules; reserve AI for explanation or text synthesis where needed.
- If no hosted model or connector exists, provide a local or rules-only prototype and state its limits.
Checkpoint: A working prototype with traceable result logic.
Create the product connection
- Explain how the main product helps with the larger job after the free result.
- Keep the call to action relevant and any lead-capture behavior consistent with the approved brief.
Checkpoint: A useful result screen with an honest next step.
Test representative journeys
- Exercise typical, boundary, blank, and malformed inputs and compare results with hand-calculated expectations.
- Check mobile layout, keyboard operation, and failure handling for any external dependency.
Checkpoint: Recorded acceptance results and corrected defects.
Prepare a bounded launch
- Review claims, data handling, and the authorized deployment destination.
- After an approved release, verify the live input-to-result path and lead receipt separately.
Checkpoint: A reviewed release candidate or verified authorized deployment.
Decisions along the way
Rules are not agreed
Create a clickable mockup with illustrative results clearly labeled; do not present it as a working calculator.
External AI is unavailable
Offer a clear retry or a supported deterministic result instead of fabricated analysis.
Lead capture fails
Preserve the useful result and show the honest submission state.
What you will produce
free-tool-prototype
Project filesA bounded implementation that can be reviewed and tested.
Include: input_schema · result_logic · interface · error_states
acceptance-checks.md
MarkdownDocuments real behavior instead of assuming generated code works.
Include: test_case · inputs · expected · observed · status
Check the result
- Recalculate every example with an independent method.
- Confirm invalid values cannot produce plausible-looking success results.
- Test the complete result and optional lead path on mobile.
- Verify no unapproved endpoint receives user input.
When something goes wrong
Generated code adds unrelated features
Remove them and return to the bounded acceptance brief.
Formula implementation disagrees with the approved rule
Fix the deterministic logic before polishing explanatory text.
Submission times out
Check for an existing receipt before retrying any external write.
A worked example
SYNTHETIC EXAMPLE · NOT A REPORTED BUSINESS RESULT
Request
Build a simple meeting-cost estimator.
Inputs
Synthetic example. Synthetic inputs are 4 attendees, 0.5 hours, and a supplied hourly cost of 40 per attendee.
Expected result
Synthetic expected result. The deterministic estimate is 80, labeled as an estimate based on supplied rates. A missing hourly cost asks for input rather than silently using zero.
Run a small pilot
Start small
One narrow task with a handful of representative prospective users.
Record the baseline
Record current task completion time and common calculation or input mistakes.
Agree success criteria
Agree useful-result completion and error criteria before evaluating conversion.
Stop or revise
Stop release if core results are incorrect or user data reaches an unapproved destination.
Keep the scope clear
- A prototype request does not authorize a public deployment or marketing outreach.
- Do not invent measured savings, conversion rates, or product capabilities.
Check before using
Check results, invalid inputs, and navigation; measure acquisition performance separately.
Business activities
- Handle inbound enquiries
- Build and change software
FROM A RECIPE TO YOUR WORKFLOW
Bring the company context together.
This workflow needs reliable inputs before it needs a better prompt. Moat8 Vault brings working information into a readable archive for the AI tools you use.
For this recipe: Recurring audience task · Input data · Definition of a useful result
Start with one recurring task, agree which sources to use, and review the first result with your team.
Discuss this workflow