Use Adjie Brotools in your AI

13 of these free calculators come with a skill for Claude, ChatGPT, Grok, Gemini and Copilot. Install the ones you need, then ask your question in plain words. Your AI looks up what you did not say, lists every assumption with its source, and replies with one link that opens the tool on your scenario. The tool works out the answer, so the figures you see are the tool's, not the chatbot's.

Each skill is a .zip: SKILL.md (how to answer), references/ (every input, its range and the Quick Starts) and scripts/build_link.py (builds and checks the link). Each tool's AI page has the download.

Install the skill

Pick your assistant. The demo plays the steps; press a step to jump to it.

    Menus move as these apps update: look for Skills (Claude: Settings, Customize; ChatGPT and Grok: Plugins; Gemini: Customise; Copilot: inside an agent). Gemini takes the unzipped folder; the others take the zip as it is. No skill support on your plan? Attach brotools-<tool>.zip or its SKILL.md to the chat and say "use this skill".

    Effective 7 November 2026. AI changes quickly: the UI, plans and features may be different by the time you see this.

    How to use it

    Ask as you would ask a friend. With the skill on, the AI keeps your figures, researches the rest, and hands you the link. It does not give the answer itself: the tool does, once you open the link.

    Should I buy an $800,000 house or keep renting for $700 per week?

    Using skill brotools-rentvsownhouse Searched: Western Australia transfer duty on $800,000 Searched: Average variable mortgage rate in Australia, November 2026 Ran scripts/build_link.py: link checked

    Your inputs

    • Property price: $800,000
    • Rent amount: $700 a week

    Assumptions

    1. Place: you did not say where. A rent quoted per week in dollars is how Australia quotes it, and $800,000 buys a 2-bedroom house in Perth, so the link starts from the Perth 2-bedroom house Quick Start (qs=perth/house-2br). Tell me your city and I will send a new link.
    2. Loan: a 20% deposit and a mortgage at 6.4% a year over 30 years, near the going variable rate for an owner-occupier in November 2026.
    3. Setup cost: 4.4% of the price, for Western Australian transfer duty on $800,000 (about $32,300) plus conveyancing and inspections.
    4. Ongoing costs of owning: $7,500 a year for council and water rates, insurance and upkeep.
    5. Growth and returns, from the Quick Start: house prices 4.5% a year, rent 3.5% a year, spare cash earning 4.6% a year, selling costs of 2.8%, compared over 30 years.

    Your scenario

    Open Rent vs Own on this scenario

    https://tool.adjiebrotots.com/rentvsownhouse/#load&v=1&qs=perth/house-2br&propertyPrice=800000&rentAmount=700&setupCost=4.4&why.setupCost=WA%20transfer%20duty%20on%20$800,000%20%28about%20$32,300%29%20plus%20conveyancing%20and%20inspections&ownOngoingCost=7500&why.ownOngoingCost=Council%20and%20water%20rates,%20insurance%20and%20upkeep%20on%20an%20$800,000%20house,%20about%200.9%25%20a%20year&note=Assumed%20Perth,%20November%202026,%202-bedroom%20house

    Open the link to see the result.

    • Your figures stay yours. Anything you state goes in as you said it; correct any assumption and the AI sends a new link.
    • Checked before you see it. The skill's script checks every input's name, range and choices before the AI sends the link, so it opens the scenario listed.
    • The tool shows what the AI chose. When the link opens, a banner lists each value the AI set and why, with an Undo back to your own inputs.

    Tools with a skill

    Open a tool to use it yourself, or get its skill to use it through your AI. In Copilot, one agent can hold all of them.

    Showing 13 skills.

    Engineering

    • Capacity Expansion Planner

      Free capacity expansion planner in your browser. Find the least-cost size and timing of new solar, wind, gas and batteries for a growing load. PyPSA and HiGHS.

      brotools-capacity-expansion-planner

    • ED/UC Simulator

      Free economic dispatch and unit commitment solver in your browser. Draw a network, solve it hour by hour and read the nodal prices (LMP). PyPSA and HiGHS.

      brotools-ed-uc-simulator

    • Load Flow Simulator

      Free online load flow calculator. Draw a single-line diagram, run an AC Newton-Raphson or DC load flow in your browser and export the animated flows.

      brotools-loadflow-simulator

    • PowerFactory Scripter

      Build DIgSILENT PowerFactory study workflows from blocks: load flow, RMS, EMT, harmonics, loops and result tables, as one ready-to-run Python file.

      brotools-powerfactory-scripter

    • PSCAD Scripter

      Build PSCAD EMT study workflows from blocks: build and run, faults, snapshots, layers, parallel simulation sets, checks and result tables, as one ready-to-run Python file.

      brotools-pscad-scripter

    Finance

    • Borrowing Capacity

      Work out how much an Australian bank would lend you: income shading, tax, HEM living costs, commitments, the APRA buffer, and the DTI, LVR and deposit caps.

      brotools-borrowingcapacity

    • Cost of Living Comparator

      Compare living costs across cities to understand how far your salary goes before relocating or negotiating pay.

      brotools-costofliving-comparator

    • DCA Scenario Explorer

      Compare dollar-cost averaging strategies across securities using market data or custom assumptions.

      brotools-dcasimulator

    • Finance vs Cash

      Compare paying cash versus financing a purchase while investing unused cash. Models flat rate, interest-only, balloon, variable and known-repayment loans.

      brotools-financingvscash

    • Financial Freedom

      Work out the pot you need before you can stop working, and the age you actually reach it. Inflation-adjusted, with a confidence band for good and bad markets.

      brotools-financialfreedom

    • Pisah vs Gabung Harta

      Compare Indonesian PPh 21 personal income tax under separate and joint filing scenarios.

      brotools-pisahvsgabung

    • Rent vs Own

      Model renting versus buying property over time by comparing cash, equity, and net wealth scenarios.

      brotools-rentvsownhouse

    • Valuate Everything

      Is that listing a fair price? Enter listings you have seen, fit a price model to age, kilometres or land size, and check what you want to buy in 2D or 3D.

      brotools-valuateeverything

    Ready to try it?

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