One brain for your company's decisions.
Run the free tools first, then choose Starter for saved runs or Pro for shareable Decision Memos, reports, and workflow handoffs.
All prices shown in USD
Billing cycle for the Pro plan
Free
Run every decision tool across 12 industries on your numbers. No account or card.
Try the tools on a few live decisions before you make an account.
- Every structured decision tool across 12 industries — real outputs, full decision trails
- Run in your browser; results stay in this session (no account needed)
See all included details
- 3 free runs per tool per day, no account needed.
- CSV export and saved runs start on Starter; JSON export and tool handoff links start on Pro
BrainStack Studio Starter
Essential tools for growing businesses
14-day trial. No card to start. $29 USD/mo after trial.
Best when you need a private decision log: saved history, CSV exports, and one rewrite per day.
Starter keeps your own work organized. Move to Pro when results need to become reports, follow-ups, reusable handoffs, or connected workflows.
Trial and billing details
No card to start.
- Everything in Free, plus:
- Run every decision tool as often as needed
- CSV export of calculator results
See all included details
- Save your tool runs to your account (reopen with assumptions intact)
- One AI-assisted rewrite per day: turn a dense result into a plain memo
- Monitored email support
BrainStack Studio Pro
14-day trial. No card to start. $99 USD/mo after trial.
Best when decisions need to leave your browser: shareable memos, reusable handoffs, unlimited rewrite help, and tracked workflow access.
$99/mo is for serious follow-through: Pro turns each saved run into shareable reports, unlimited plain-language rewrites, reusable handoffs, JSON exports, and tracked access for internal scripts.
Trial and billing details
No card to start. Pro is $99 USD/mo after trial.
- Everything in Starter, plus:
- Turn every result into a clear memo whenever you need one
- Share board-ready reports and machine-readable exports
See all included details
- Save unlimited runs across every device: reopen any past scenario exactly as you left it
- Carry assumptions between ROI, Cash Flow, Break-Even, and Pricing without retyping
- Connect internal scripts to the tools with tracked usage and 100 authenticated requests per minute
- Turn a described process into draft modules, runbooks, and proof gates
- Draft follow-up emails, summaries, and next steps from every tool result
- Pro support SLA: tracked Pro tickets target support response within 4 hours; billing and access issues are triaged first.
Monthly limits
Free, Starter, and Pro at a glance
Free
$0
- 3 free runs per tool per day
- No account or card required for those runs
- Browser-only result unless you sign up to save it
Starter
$29/mo
- Unlimited decision-tool runs
- Saved run history and CSV export
- One AI-assisted rewrite per day and 3 content drafts per day
Pro
$99/mo
- Everything in Starter
- Unlimited AI-assisted rewrites and content drafts while providers are available
- Board-ready reports, reusable tool handoffs, JSON export, and tracked internal-script access at 100 requests/min
Billing terms
14-day no-card trial
- Starter is $29 USD/mo after trial.
- Pro is $99 USD/mo after trial, or $990 USD/yr on annual billing.
- No card to start. No charge until day 15; cancel anytime.
- If billing is not added before the trial ends, paid access ends instead of auto-billing.
The math is the proof.
Every figure on the /proof page was computed seconds ago by the same engines that power these tools. Re-run any of them with your own inputs and get the identical result.
Deterministic, auditable math
Every result is a pure function of your inputs. Same numbers in, same answer out — re-run it next quarter and reproduce it exactly. No hidden randomness, no model drift.
See it run live →Published formulas, standard citations
NPV, payback, break-even, and contribution margin use textbook definitions — cited to Brealey, Myers & Allen and Horngren. Check the math against any finance reference. That is the point.
Human review gates, not blind automation
Every run shows inputs, assumptions, and decision trail — attached for a teammate to review before any action. These tools never send emails, change policies, or move money on their own.
15
decision tools
Public and paid tool surfaces render from the tool registry.
Source: TOOLS registry
12
industry paths
Explorer routing covers these configured operating contexts.
Source: INDUSTRIES explorer registry
7
workflow examples
Solution pages render from the workflow example registry.
Source: SOLUTIONS registry
What happens after I start Pro?
Quickest path to Pro
Start a free trial, run your first scenario, then decide.
Founder, operator, or finance lead with a live business question
A structured decision memo with assumptions, scenario notes, and next steps
Full 14-day trial access. No card to start.
Security and proof notes
Compare every plan detailOpen the full feature table when you need the fine print.
Plan Comparison
Frequently Asked Questions
Need one last check before choosing?
Ready to build your first Decision Memo?
Start your 14-day free trial. No card to start. No charge until day 15; cancel anytime. If billing is not added before the trial ends, access ends instead of auto-billing. Your first run produces a Decision Memo with assumptions, scenarios, and approval trace.