# Slatemath - Calculator — Editable tape. Pay once.

> Editable tape. Pay once. (iPhone/iPad app by 焕 徐.)

- Source: https://appshunter.io/ios/app/slatemath-calculator/id6767100280 (this page in markdown: same URL + `.md`)
- Developer: [焕 徐](https://appshunter.io/developer/1896342391)
- Category: Utilities, Productivity
- Price: $4.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-05-12
- Data updated: 2026-07-30
- User reviews in markdown: https://appshunter.io/ios/app/slatemath-calculator/id6767100280/reviews.md

## What is Slatemath?

$4.99. ONCE. FOREVER.
No subscription. No ads. No "free trial" that auto-charges.

Built for people who think with numbers.

• Edit any step in your tape — everything below auto-recalculates.
• Scientific mode in one tap (no rotating).
• Multi-sheet workflows: separate boards for groceries, contracts, projects.
• Variables: define `tax = 0.08` and reuse across calculations.
• Aggregate bar: sum, average, max, min, count, std on selected lines.
• Currency snapshots (100+ fiat + Bitcoin, offline) and unit conversion (length, weight, temperature, speed, data, energy, pressure, time).
• Time math: today + 30 days, 3h45min + 1h30min, time-zone conversion.
• PDF / CSV export with multipage table layout.
• Widgets — small, medium, large, lock screen.
• Live Activities + Dynamic Island for long edit sessions.
• Works perfectly on iPhone and iPad.
• iCloud sync across all your Apple devices.
• 100% offline, 100% private — zero analytics, zero ads.

Universal Purchase: pay $4.99 once, unlock Pro on iPhone and iPad forever.

## Pricing and in-app purchases

Base price: $4.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Slatemath Pro | $4.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-05-13

No release notes.

## More apps by 焕 徐

- [Footing: Construction Calc](https://appshunter.io/ios/app/footing-construction-calc/id6767874256)
- [Compresso: Photo Compress](https://appshunter.io/ios/app/compresso-photo-compress/id6772483158)
- [VizPeek: Magnifier & Reader](https://appshunter.io/ios/app/vizpeek-magnifier-and-reader/id6772536369)
- [SoniMeter: Sound Level Meter](https://appshunter.io/ios/app/sonimeter-sound-level-meter/id6772677494)
- [Metronome: PureBeat](https://appshunter.io/ios/app/metronome-purebeat/id6772968913)

All apps by 焕 徐: https://appshunter.io/developer/1896342391

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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 2026-07-30.*