# Crumb — Baker's Math — Sourdough & bread calculator

> Sourdough & bread calculator (iPhone/iPad app by Sangwon Kim.)

- Source: https://appshunter.io/ios/app/crumb-bakers-math/id6816087992 (this page in markdown: same URL + `.md`)
- Developer: [Sangwon Kim](https://appshunter.io/developer/1677937052)
- Category: Food & Drink, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 26 MB
- Languages: American English, Korean
- Released: 2026-10-14
- Data updated: 2026-10-18

## What is Crumb?

Baker's percentages, total hydration and water temperature, worked out as you type.

Crumb is a formula calculator for sourdough and home bakers. Enter a formula in grams or in percentages, and the other column updates as you go.

■ Features
• Baker's percentages and grams, editable in either direction
• Total hydration that counts the water in your levain and in wet add-ins such as egg, milk, butter and honey
• Prefermented flour percentage, pinned at the top of the formula
• Scale a batch by number of pieces and piece weight, or by total dough weight, with an optional loss percentage
• A measuring sheet in grams, ounces or pounds
• Water temperature for your desired dough temperature (DDT), with hand and mixer friction presets
• Celsius or Fahrenheit

■ Free
The whole calculator and 3 saved formulas. A banner ad appears on the formula list only. The formula editor and the water temperature screen have no ads.

■ Crumb Pro (one-time purchase)
• Unlimited saved formulas, plus Duplicate
• Share the measuring sheet as an image
• No ads

Pro is a single purchase, not a subscription. You can restore it on other devices signed in with the same Apple Account.

■ Just the math
Crumb calculates and nothing else: no timers, no reminders, no account. Your formulas stay on your device.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Crumb Pro | $3.99 | one-time |


## Is Crumb safe?

Not enough ratings yet to assess Crumb.

## Is Crumb legit?

Crumb — Baker's Math appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Crumb is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0.0 — 2026-10-14

No release notes.

## More apps by Sangwon Kim

- [Build Ur: Build your Life](https://appshunter.io/ios/app/build-ur-build-your-life/id6450644562)
- [seizetheday - Routine & Habit](https://appshunter.io/ios/app/seizetheday-routine-and-habit/id6754905920)
- [Runsheet — Presenter Timer](https://appshunter.io/ios/app/runsheet-presenter-timer/id6790088291)
- [Cadence: Minimal Routine](https://appshunter.io/ios/app/cadence-minimal-routine/id6790137139)
- [Gridline: Grid & Value Study](https://appshunter.io/ios/app/gridline-grid-and-value-study/id6816087951)

All apps by Sangwon Kim: https://appshunter.io/developer/1677937052

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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 2026-10-18.*