Narrow the strongest direction
Compare multiple hypotheses and keep the business direction with the clearest signal.
PrototypeR
For solo founders and early builders
Turn your idea intoa stronger business direction
Use simulated market validation and automated improvement loops to pressure-test your idea before you build.
50 free credits for new signups
Log in when you are ready to start the full workflow.
What you get before you build
See what to improve next
Find the main blockers lowering buyer intent and focus on the next fix that matters.
Move straight into design
Carry the validated direction directly into prototype-ready product design.
The flow is simple
You can review the detailed workflow below.
01
Input the idea
Start with the problem, audience, and value you want to validate.
02
Run market validation
Use AI-generated customer reactions to check whether the idea has traction.
03
Improve and move into design
Strengthen the idea with the feedback loop and turn it into a handoff-ready plan.
8-step workflow
Open the full 8-step flow before you start.
Details
8-step workflow
Open the full 8-step flow before you start.
8-step workflow
Open the full 8-step flow before you start.
01Idea Input
Idea Input
Describe the problem, audience, and value proposition you want to test.
02Interview Design
Interview Design
Generate the questions and decision criteria for customer discovery.
03Persona Build
Persona Build
Create simulated customer segments for the validation panel.
04Market Selection
Market Selection
Compare candidate directions and narrow the strongest business angle.
05Strategy Canvas
Strategy Canvas
Clarify positioning, pricing, and the go-to-market structure.
06Product Blueprint
Product Blueprint
Turn the strategy into features, UX flows, and system requirements.
07Validation Loop
Validation Loop
Run automated market validation with 3 initial loops and 2 bonus loops when available.
08Prototype Package
Prototype Package
Generate the implementation-ready handoff materials for the next build step.
Step 01
Idea Input
Describe the problem, audience, and value proposition you want to test.
Step 02
Interview Design
Generate the questions and decision criteria for customer discovery.
Step 03
Persona Build
Create simulated customer segments for the validation panel.
Step 04
Market Selection
Compare candidate directions and narrow the strongest business angle.
Step 05
Strategy Canvas
Clarify positioning, pricing, and the go-to-market structure.
Step 06
Product Blueprint
Turn the strategy into features, UX flows, and system requirements.
Step 07
Validation Loop
Run automated market validation with 3 initial loops and 2 bonus loops when available.
Step 08
Prototype Package
Generate the implementation-ready handoff materials for the next build step.
How PrototypeR differs from general AI tools
For people who want the decision criteria before they start.
Details
How PrototypeR differs from general AI tools
For people who want the decision criteria before they start.
How PrototypeR differs from general AI tools
For people who want the decision criteria before they start.
Evaluation method
Generative AI
Depends on response quality in chat
PrototypeR
Uses quantitative signals from a simulated market
Improvement process
Generative AI
Manual re-prompting
PrototypeR
Built around automated improvement loops
Implementation handoff
Generative AI
Needs manual restructuring
PrototypeR
Moves from validation into design deliverables
Team sharing
Generative AI
Chat-log centric
PrototypeR
Structured outputs that are easier to share
Pricing model
Credits are prepaid. Execution stops when the balance is insufficient.
Details
Pricing model
Credits are prepaid. Execution stops when the balance is insufficient.
Pricing model
Pay only for the runs you execute.
- Credits are prepaid. Execution stops when the balance is insufficient.
- Planning, validation, and prototype generation consume credits only when you run them.
Light Mode
Faster and cheaper for idea shaping and quick iteration.
Planning (Step1-6)
3 credits
Charged on the initial generation only.
Validation (Step7 session)
8 credits
Charged only when buyer intent reaches 60%. Includes automated improvement cycles.
Prototype generation (Step8)
3 credits
Charged per generation.
Think Mode
Higher precision for deeper validation and richer prototype outputs.
Planning (Step1-6)
15 credits
Charged on the initial generation only.
Validation (Step7 session)
40 credits
Charged only when buyer intent reaches 60%. Includes automated improvement cycles.
Prototype generation (Step8)
9 credits
Charged per generation.
1 credit is approximately JPY 10 in prepaid value.
Common questions
Review the common questions before you start.
Details
Common questions
Review the common questions before you start.
Common questions
How does pricing work?
PrototypeR uses prepaid credits. Planning, validation, and generation each consume credits only when you execute them, and execution stops when the balance is insufficient.
Can I try it before signing up?
Sign up to start the full workflow immediately. You can begin with a narrow scope and expand only where you need more evidence.
Who owns the generated outputs?
The generated deliverables belong to the user.
Are the AI suggestions and scores guaranteed to be correct?
No. They are decision support based on simulated personas, so they should be treated as reference signals rather than guarantees.
Can other users see my content?
No. Other people can view it only if you explicitly share a read-only link.
Can I export the outputs?
Yes. Requirements, validation outputs, and other artifacts can be shared or exported from the product surfaces.
8-step workflow
This section is for readers who want the full step-by-step flow.
01Idea Input
Idea Input
Describe the problem, audience, and value proposition you want to test.
02Interview Design
Interview Design
Generate the questions and decision criteria for customer discovery.
03Persona Build
Persona Build
Create simulated customer segments for the validation panel.
04Market Selection
Market Selection
Compare candidate directions and narrow the strongest business angle.
05Strategy Canvas
Strategy Canvas
Clarify positioning, pricing, and the go-to-market structure.
06Product Blueprint
Product Blueprint
Turn the strategy into features, UX flows, and system requirements.
07Validation Loop
Validation Loop
Run automated market validation with 3 initial loops and 2 bonus loops when available.
08Prototype Package
Prototype Package
Generate the implementation-ready handoff materials for the next build step.
Step 01
Idea Input
Describe the problem, audience, and value proposition you want to test.
Step 02
Interview Design
Generate the questions and decision criteria for customer discovery.
Step 03
Persona Build
Create simulated customer segments for the validation panel.
Step 04
Market Selection
Compare candidate directions and narrow the strongest business angle.
Step 05
Strategy Canvas
Clarify positioning, pricing, and the go-to-market structure.
Step 06
Product Blueprint
Turn the strategy into features, UX flows, and system requirements.
Step 07
Validation Loop
Run automated market validation with 3 initial loops and 2 bonus loops when available.
Step 08
Prototype Package
Generate the implementation-ready handoff materials for the next build step.
How PrototypeR differs from general AI tools
For people who want the decision criteria before they start.
Evaluation method
Generative AI
Depends on response quality in chat
PrototypeR
Uses quantitative signals from a simulated market
Improvement process
Generative AI
Manual re-prompting
PrototypeR
Built around automated improvement loops
Implementation handoff
Generative AI
Needs manual restructuring
PrototypeR
Moves from validation into design deliverables
Team sharing
Generative AI
Chat-log centric
PrototypeR
Structured outputs that are easier to share
Pricing model
Pay only for the runs you execute.
- Credits are prepaid. Execution stops when the balance is insufficient.
- Planning, validation, and prototype generation consume credits only when you run them.
Light Mode
Faster and cheaper for idea shaping and quick iteration.
Planning (Step1-6)
3 credits
Charged on the initial generation only.
Validation (Step7 session)
8 credits
Charged only when buyer intent reaches 60%. Includes automated improvement cycles.
Prototype generation (Step8)
3 credits
Charged per generation.
Think Mode
Higher precision for deeper validation and richer prototype outputs.
Planning (Step1-6)
15 credits
Charged on the initial generation only.
Validation (Step7 session)
40 credits
Charged only when buyer intent reaches 60%. Includes automated improvement cycles.
Prototype generation (Step8)
9 credits
Charged per generation.
1 credit is approximately JPY 10 in prepaid value.
Common questions
How does pricing work?
PrototypeR uses prepaid credits. Planning, validation, and generation each consume credits only when you execute them, and execution stops when the balance is insufficient.
Can I try it before signing up?
Sign up to start the full workflow immediately. You can begin with a narrow scope and expand only where you need more evidence.
Who owns the generated outputs?
The generated deliverables belong to the user.
Are the AI suggestions and scores guaranteed to be correct?
No. They are decision support based on simulated personas, so they should be treated as reference signals rather than guarantees.
Can other users see my content?
No. Other people can view it only if you explicitly share a read-only link.
Can I export the outputs?
Yes. Requirements, validation outputs, and other artifacts can be shared or exported from the product surfaces.
Start with the workflow now
Log in and move directly into the full validation and prototyping flow.