# Formula Lab - Calc & Simulator — Custom Formula Calculator

> Custom Formula Calculator (iPhone/iPad app by Yusuke Ishino.)

- Source: https://appshunter.io/ios/app/formula-lab-calc-and-simulator/id6751499997 (this page in markdown: same URL + `.md`)
- Developer: [Yusuke Ishino](https://appshunter.io/developer/1481440351)
- Category: Productivity, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 49 MB
- Languages: American English, Japanese
- Released: 2025-09-18
- Data updated: 2026-09-23
- User reviews in markdown: https://appshunter.io/ios/app/formula-lab-calc-and-simulator/id6751499997/reviews.md

## What is Formula Lab?

For those who demand more than just a simple calculation.
Formula Lab is a next-generation simulation tool that lets you build your own calculation models and instantly visualize complex "what-if" scenarios with countless variables.


◆ Start in One Tap with Templates
Includes a rich library of practical, professional templates like "Compound Interest," "Game Damage (Crit Avg.)," and "Loan Payments." Complex formulas become yours with a single selection. No need to start from scratch.

◆ Build & Grow Your Calculator at Your Fingertips
Freely create and edit your own unique formulas in a powerful editor that supports functions like max(0, {ATK} - {DEF}), min(), and floor(). Parameters can be written simply as {Variable Name}.

◆ Switch Scenarios Instantly with Presets
Save combinations of parameter values as named Presets like "Warrior Lv10" or "Bear Market Scenario." Instantly switch between situations from a dropdown menu to compare how results change.

◆ Discover the Optimal Solution with Dynamic Graphs
Simply choose a parameter for the X-axis to see how results change on a beautiful graph. As you move the sliders, the graph transforms in real-time. Better yet, you can overlay the before-and-after graphs to compare them, allowing you to intuitively find the perfect balance.

◆ Structure Your World with Entities
Individually manage groups of parameters (Entities) like "Player" and "Enemy," or "Product A" and "Product B." Handle complex interactions between entities, such as {Player:Attack} - {Enemy:Defense}, all within this single tool.

◆ Organize Your Thoughts by Reusing Formulas
A formula you create (e.g., Base Damage) can be called from another formula using {f:Base Damage}. Break down complex calculations into reusable components to keep your thoughts clear.

【Perfect for...】

● Gamers pursuing the ultimate build and theorycrafting in RPGs and simulation games.
● Individuals wanting to compare various scenarios for investments or loan repayment plans.
● Business professionals looking for an easy way to perform "What-if analysis" on their smartphone, as a handy alternative to Excel or spreadsheets.
● Students and researchers who want to interactively learn physics and chemistry formulas by adjusting variables.

Unleash your spirit of inquiry.


■ Subscription - Premium Plan
1-Month Plan
Enjoy an ad-free, unrestricted experience for one month.

■ About Auto-Renewable Subscriptions
Your subscription will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period.

■ How to Cancel
You can cancel your subscription by navigating to Settings > iTunes Store & App Store > Apple ID > View Apple ID > Subscriptions.

■ Restoring Purchases
If you have an active subscription, you can restore it via the "Restore Purchase" option.

■ Cancellation Policy
Cancellations can only be made through the method described above.

■ Privacy Policy
https://myappsintro.web.app/page/privacypolicy/

■ Terms of Use (EULA)
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Plan | $1.99 | per month |



## Version history (last 1 release)

### 1.0.0 — 2025-09-18

No release notes.

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## More apps by Yusuke Ishino

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All apps by Yusuke Ishino: https://appshunter.io/developer/1481440351

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-23.*