Free trial — $0
Guests get 1 simulation. Signed-in free accounts get 2 simulations. No payment is required.
Plan your first run
An AI simulator for your next decision
Explore how people with different goals might react to a change. Use MiroFish to compare possible responses, find weak assumptions, and decide what to test next.
Choose a question the simulator can explore
A useful fit
Decisions involving people with competing incentives: a product launch, a community rule, a policy proposal, or a negotiation. Supply facts that constrain how participants could respond.
Use another method when needed
Physical engineering calculations need validated numerical models. Measured customer preferences need real research. A language-based simulation cannot establish either by itself.
Run your first scenario
Open the console
Start in your browser. Enter the decision you want to explore; no code is required.
Make the brief specific
Include the options, participant roles, constraints, and time horizon. Check the prepared brief and correct missing or mistaken details.
Follow the simulation
Review the relationship graph and the different perspectives as the run progresses. Distinguish supplied facts from generated assumptions.
Read the report and choose a next step
Compare the arguments and risks. Identify evidence that would change your decision, then use real observations to test it.
Example: change a community rule
This sample scenario shows how to frame a first run. It does not represent measured results.
Decision
Should a community restrict promotional posts to one weekly thread?
Participants and constraints
Consider new members, regular contributors, moderators, and small business owners. Add the current rules, recent member feedback, moderation capacity, and a four-week trial period.
Question
How could each group react to a weekly thread compared with the current policy? Which exceptions or explanations might reduce friction?
After the run, compare the objections and proposed compromises. Use a real member survey or a limited trial to test the most consequential assumptions.
See the workspace
Try a scenario, then choose a plan
Starter — $9 / month
10 analyses per month. Renews monthly until canceled.
Pro — $29 / month
50 analyses per month. Renews monthly until canceled.
Enterprise — $59 / month
320 analyses per month. Renews monthly until canceled.
Questions before you start
What kind of AI simulator is MiroFish?
MiroFish simulates participant perspectives for decisions and scenarios. It is useful for exploring reactions and tradeoffs; it is not a physics simulator or a source of guaranteed outcomes.
Do I need to install anything or write code?
No installation or code is needed for the hosted workflow. Open the console in your browser and describe the question you want to explore.
What makes a useful first scenario?
Choose one decision with a clear time horizon. Name the affected groups, add the facts and constraints you know, and state which alternatives you want to compare.
How much does it cost to try?
The free trial includes 1 guest simulation or 2 simulations on a signed-in free account. Starter costs $9 per month and includes 10 analyses per month.
What should I do after reading the report?
Review the assumptions and disagreements, choose a claim to test outside the simulation, and add better evidence before rerunning. Do not treat generated reactions as measured customer research.