THE EVERYDAY COLLECTION
Free
For the question in front of you.
$0/ month
Core calculators remain free.
- All standard calculators
- Formula explanations and worked examples
- Local history and favorites
- Export and delete your own work
A GOOD ANSWER. A USEFUL PLACE TO KEEP IT.
Keep the work
behind the number.
Free tools for everyday questions. Thoughtful memberships for the calculations, collections, and decisions you come back to.
Membership previewProposed launch prices. Billing is not active, and no purchase is available.
All proposed prices are in USD. Applicable taxes would be shown before purchase.
YOUR RETURN-TO SPACE
Plus
For the numbers you come back to.
$5/ month
$60 per year · save $12
- Private calculator sets
- Saved inputs, results, and revisions
- Revocable snapshot sharing
- Organize recurring personal workflows
YOUR REPEATABLE WORK
Studio
For work worth making repeatable.
$15/ month
$180 per year · save $36
- Everything proposed for Plus
- Reusable custom calculators
- Advanced version comparisons
- Branded published calculator embeds
PLUS / WHAT IT IS FOR
Keep a collection of useful decisions.
The proposed Plus membership is for recurring work: a project, household, shop, or plan that brings several calculators and results together.
Try calculator sets- Organize calculator sets around a purpose.
- Keep the inputs and results that explain a decision.
- Share a selected snapshot while keeping later changes separate.
A CLEARER LOOK
The proposed shape of membership.
Allowances are product hypotheses, not current billing limits.
Final terms will be shown before any paid launch.
| Capability | Free | Plus | Studio |
|---|---|---|---|
| Standard calculator collection | Included | Included | Included |
| Export and delete your own work | Always | Always | Always |
| Proposed saved-set allowance | 3 | 100 | 1,000 |
| Proposed revisions per set | 5 | 100 | 500 |
| Proposed published calculators | — | 5 | 50 |
| Branded embeds | — | — | Planned |
| Team roles and approvals | Separate future offering | Separate future offering | Separate future offering |
THE THINGS WE KEEP SIMPLE
Your work remains your work.
Accuracy stays available.
Paying changes how much work you can organize and publish. It does not unlock a more accurate version of the same formula.
Keep a portable copy.
Export and deletion remain available. A downgrade should preserve access to existing work while limiting new paid activity.
Know what changed.
Versions, inputs, assumptions, and rule context belong with a saved result. Sharing should make the selected snapshot clear.
A few useful details.
Can I subscribe today?
No. This is a preview of the proposed membership model. Billing is not connected and no payment is collected. The calculator collection and current product preview remain available.
What does the prompt builder do today?
It creates editable drafts for supported calculation patterns and explicit formulas. You review the meaning, inputs, and method, then check a known example. A personal review is not professional or regulatory certification.
Explore the builder →Does a language preference choose my tax rules?
No. Display language is separate from jurisdiction, tax year, currency, and industry. A rule-dependent tool needs the right context and an applicable reviewed rule set.
See how rule context works →Will there be advertisements or affiliate links?
They are possible future revenue sources. There are no advertising scripts or active affiliate programs in this release. Future placements must be clearly labeled, and commercial relationships must not change a calculation.
Read the partnership principles →Will team access be included?
Shared team ownership, role permissions, approval flows, and organization billing are a separate future offering. A share link alone does not provide those controls.