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About this tool
Turn a project's before/after numbers into a case study prompt built on STAR, CARE, Double Diamond or Problem-Process-Outcome.
The Portfolio Writeup Prompt Builder takes a project's before and after numbers, works out the real percentage change and multiple in the direction that counts as success, then writes an AI prompt that turns them into a case study built on a named structure — STAR, CARE, Problem-Process-Outcome or the Design Council's Double Diamond. It sizes each section against your target word count and estimates reading time at 238 words per minute. For designers, engineers and marketers who have the work but not the writeup.
Open Portfolio Writeup Prompt Builder on AltFTool — it loads instantly in your browser.
Enter the Project name, Your role on it, the Headline metric and its Before and After values, then set 'Which way is good?' so a fall in bounce rate scores as an improvement.
Choose the Case-study structure — STAR, CARE, Problem → Process → Outcome or Double Diamond — and set Target length (words) between 150 and 3000; sections are sized against it and a reading time computed at 238 words per minute.
Check the percentage change and multiple shown above the results list, then press 'Copy prompt' to take the generated prompt from the 'Your prompt' panel.
Tell it whether higher or lower is better and a fall in bounce rate is scored as a win, not a loss.
Target word count is split across the structure's sections and converted into a reading time.
The prompt forbids the model from adding any figure that is not in the facts you supplied.
At minimum: the problem, your specific role, what you actually did, and one measurable outcome with a before and after value. Recruiters skim, so the outcome sentence belongs at the top — this tool's prompt forces the opening line to state the number before any background.
Around 400-700 words is enough for most roles, which at 238 words per minute is a two- to three-minute read. Longer writeups are worth it only for a senior or lead role where the reader wants the reasoning behind each decision.
STAR (Situation, Task, Action, Result) is an interview answer format that keeps you accountable for your own contribution, while the Double Diamond (Discover, Define, Develop, Deliver) is the UK Design Council's process model and shows how you diverged and converged. Use STAR when the reader wants outcomes, Double Diamond when they want to see your process.
Percentage change is (after − before) ÷ before × 100, and when lower is better you flip the sign so a reduction reads as a positive improvement. A change from 4.2s to 1.4s is a 66.7% reduction, which is the same thing as 3x faster — quote whichever is less flattering to your own claim if you want to stay credible.