Complete AI Training

AI app for product development · no coding needed

Assumption-driven project plan and cost workspace

Reduce rework in project scoping while keeping every estimate traceable to its assumptions.

Made for: Agencies, consultancies and internal product teams scoping custom software work

What Assumption-driven project plan and cost workspace looks like
Open the demo For members · a working demo with sample data

What it does for you

The problem

Brief project descriptions become inconsistent plans, cost estimates and timelines that change silently as details shift.

What it gives you

Reviewed project plan with cost estimates, timelines and named-owner approval

What you give it

Brief project descriptionrate cardsteam constraintshistorical delivery data

Build your own version of CostGPT AI, CostGPT.ai and more

One app with what these 5 AI tools do, yours to keep and change: CostGPT AI, CostGPT.ai, EstimateAI, Quoai, Plander.ai.

Everything these tools do, in one app

  • Project plan generation Creates a structured project plan from a brief description.Found in CostGPT AI
  • Cost estimation Estimates project costs based on input parameters and data.Found in CostGPT AI, CostGPT.ai, EstimateAI and 1 more
  • Timeline generation Produces a timeline or schedule for the project.Found in CostGPT AI, EstimateAI
  • Feature breakdown Lists essential features and dependencies for development.Found in CostGPT AI
  • Sitemap and user flow Outlines product structure and user journeys.Found in CostGPT AI
  • User stories and milestones Creates user stories and suggests sprint plans.Found in CostGPT AI
  • Customizable templates Provides templates that can be tailored to different project types.Found in CostGPT.ai, EstimateAI
  • Real-time updates Adjusts estimates and plans as project details change.Found in CostGPT.ai, EstimateAI
  • Reporting and visualizations Generates detailed reports and visual aids for planning.Found in CostGPT.ai, EstimateAI
  • Integration with other tools Connects with accounting or project management software.Found in CostGPT.ai, EstimateAI
  • Quote generation Produces professional quotes quickly.Found in Quoai
  • AI recommendations Suggests optimal team configurations and cost structures.Found in Quoai
  • Cost breakdown Shows detailed breakdowns of costs, taxes, and profit margins.Found in Quoai
  • Export options Allows exporting estimates or quotes in various formats.Found in Quoai, EstimateAI
  • Goal decomposition Breaks down high-level goals into actionable tasks.Found in Plander.ai
  • Calendar integration Syncs tasks and deadlines with a calendar.Found in Plander.ai
  • Adaptive planning Updates plans when priorities or dates change.Found in Plander.ai
  • Progress tracking Provides indicators to track task completion.Found in Plander.ai

How it works, step by step

  1. Generate a structured project plan from a brief description
  2. Estimate project costs from input parameters and historical data
  3. Produce a timeline or schedule for the project
  4. List essential features and their dependencies
  5. Outline sitemap and user flows
  6. Draft user stories and suggest sprint milestones
  7. Apply customizable templates by project type
  8. Update estimates and plans as project details change
  9. Generate reports and visual aids for planning
  10. Connect with accounting and project management tools
  11. Produce professional quotes quickly
  12. Suggest team configurations and cost structures
  13. Show cost breakdowns with taxes and profit margins
  14. Export estimates and quotes in common formats
  15. Break high-level goals into actionable tasks
  16. Sync tasks and deadlines with a calendar
  17. Update plans when priorities or dates change
  18. Track task completion indicators
  19. Compare the reviewed result with the recorded baseline and value assumptions
  20. Capture corrections and named-owner approval before consequential use
  21. Export a versioned reviewed project plan with cost estimates, timelines and named-owner approval with source references and unresolved questions

Build it yourself with your AI system

Build this app yourself, no coding needed

Start with a quick version you can try in a few minutes. Like it? Then build the full app by copying and pasting our step-by-step instructions: everything is prepared for you.

Sign in to see how to build it yourself

Build a quick version to try, or get the full app pack for Assumption-driven project plan and cost workspace with the step-by-step building instructions. You don't need any technical skills: you copy, paste and answer a few questions. Both are included in the membership.

Sign in Become a member

4 Have it built for you days to a few weeks

Rather not do it yourself, or want it fully tailored to your data, your way of working and your brand? Nexibeo builds Assumption-driven project plan and cost workspace with you.

Have Nexibeo build it

What's in the app pack

Included in the Complete AI Training membership.

  • The building instructions your AI follows, step by step
  • The questions your AI will ask you about your business before it starts
  • A clickable demo you can open in your browser, to see how it should work
  • A detailed blueprint of the screens, the information it keeps and the checks it runs

Become a member to get the app packAlready a member? Sign in

The files, for the technically curious
  • START-HERE.mdHow to build it with your own AI (read first)3 KB
  • README.mdOverview and links3 KB
  • questions.mdQuestions to answer before you build2 KB
  • prompt-cloudflare.mdThe full build prompt, hosted on Cloudflare24 KB
  • prompt-vps.mdThe same build on your own server (Docker)24 KB
  • spec.jsonData model, API, AI pipeline, acceptance criteria11 KB
  • demo/index.htmlThe working demo on sample data197 KB

Questions

Do I need to know how to code?

No. You copy and paste the prompts on this page into ChatGPT or Claude, and the AI does the building. When it asks you something, you answer in your own words.

What does it cost?

The quick version, the app pack and the step-by-step instructions are for members: you pay the membership price, not a price per app (see the plans). Building the full app uses your own ChatGPT or Claude subscription. Putting it online is often cheap or no cost at the start, and your AI tells you before anything costs money.

How long does it take?

The quick version: about two minutes. The real app: an afternoon for a first version you can use, longer if you want every feature.

Can I change it to fit my business?

Yes. Tell your AI what to change in plain words, like “add a column for the price” or “use our logo and colours”. Or have Nexibeo build and customise it for you.

More detailsHow the AI works, safeguards and what to build first

Reduce rework in project scoping while keeping every estimate traceable to its assumptions. For agencies, consultancies and internal product teams scoping custom software work, convert a brief project description, rate cards, team constraints and historical delivery data into a reviewed project plan with cost estimates, timelines and named-owner approval. The benefit is a testable hypothesis, measured through accepted plans per scoping hour and estimate variance after delivery; do not assume that AI output alone produces business value.

Confirm the buyer's problem and scope, collect a brief project description, rate cards, team constraints and historical delivery data, then follow this sequence: 1. Generate a structured project plan from a brief description. 2. Estimate project costs from input parameters and historical data. 3. Produce a timeline or schedule for the project. Resolve uncertain cases with qualified reviewers, approve reviewed project plan with cost estimates, timelines and named-owner approval, and measure accepted plans per scoping hour and estimate variance after delivery against a documented baseline.

How the AI works

Use AI to interpret permitted inputs, suggest structured mappings and generate candidate outputs for the three stated task modules. Use deterministic code for arithmetic, schema validation, hard constraints and reproducible tests. Review source-linked explanations and uncertainty before accepting results. One fixed rate card and delivery model; final pricing and contractual commitments remain commercial. A model suggestion is never a verified fact, professional decision or authorization to act.

Safeguards

Preserve commercial confidentiality, source attribution, rate accuracy and usage permissions. Named owners approve substantive plan changes and external commitments. One fixed rate card and delivery model; final pricing and contractual commitments remain commercial. Keep all consequential actions under authorized human control and do not fabricate missing inputs, permissions, professional judgments or market evidence.

What to build first

Pilot scope: One fixed rate card and delivery model; final pricing and contractual commitments remain commercial. Implement one approved input format, a bounded representative case set and the first two task modules: generate a structured project plan from a brief description; estimate project costs from input parameters and historical data. Support the third module with operator review: produce a timeline or schedule for the project. Include source references, corrections, basic organization access, approval states, export and value measurement. Use managed operator assistance for unresolved exceptions. The cost estimate covers this narrow prototype, not unrestricted multi-tenant scale, complex production integrations, specialist certification or physical operations.

What it can connect to

Buyer-owned briefs, authorized rate cards and permitted historical delivery data. Accounting, project management and calendar tools. Start with file exchange and validate destination specifications before promising direct publishing. Start with authorized file exchange. Validate current provider access, usage rights and schema behavior before promising a connector.

The screens in detail

Primary screens: Brief intake and assumptions, Editable plan and estimate workspace, Client quote and delivery. Use a thumbnail gallery for projects, a large central planning canvas, and a right-hand panel for assumptions, rate cards and comments. Let users compare plan versions side by side. Display draft, changes requested and approved states. Provide a client preview link with comments anchored to the relevant line item. Make the task-specific outcome reviewed project plan with cost estimates, timelines and named-owner approval visible beside its evidence, review state and value baseline.