# Formula Book: Hair Formulas — Color formulas & client notes

> Color formulas & client notes (iPhone/iPad app by Ho Van Dai.)

- Source: https://appshunter.io/ios/app/formula-book-hair-formulas/id6810034654 (this page in markdown: same URL + `.md`)
- Developer: [Ho Van Dai](https://appshunter.io/developer/1572981836)
- Category: Business, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: Russian, Vietnamese, American English, Dutch, European Spanish, Italian, Korean, German (Germany), Brazilian Portuguese, Chinese (Traditional, Taiwan) and 3 more
- Released: 2026-09-13
- Data updated: 2026-11-12

## What is Formula Book?

Keep the last formula ready when your client returns.

Save client cards, hair color formulas, client notes and before-and-after photos in one place. Built for independent stylists and colorists working behind the chair.

WRITE THE MIX YOUR WAY
Record each bowl with brand, line, shade, grams, developer, ratio, processing time and placement. Use the built-in shade catalog, add your own shades or write a formula in your own words.

START WITH LAST TIME
Open a client's history and repeat their last visit. Adjust the formula for today, save photos and leave a note for the next appointment. Keep your go-to formulas as reusable templates.

KEEP CLIENT DETAILS TOGETHER
Find clients by name, phone or tag. Keep allergy notes and dated patch test records on the client card. Bring your client list over from Contacts or a CSV file.

TAKE YOUR RECORDS WITH YOU
Your client records work offline, without an account. Export the whole book as one backup file, keep it wherever you like and restore it on a new iPhone. Automatic daily backup keeps a fresh copy in your own iCloud, next to backups you name yourself. Create client PDFs and share before-and-after photo pairs. Protect access with Face ID.

Keep using the booking tools you already know. Formula Book holds the record of your work.

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 |
| --- | --- | --- |
| Formula Book Premium Yearly | $9.99 | per year |
| Formula Book Premium Monthly | $0.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Formula Book Premium Lifetime | $39.99 | one-time |


## Is Formula Book safe?

Not enough ratings yet to assess Formula Book.

## Is Formula Book legit?

Formula Book: Hair Formulas appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Formula Book is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.6.0 — 2026-11-11

Improved backups and bug fixes.

### 1.5.1 — 2026-10-24

Bug fixes and stability improvements.

### 1.5.0 — 2026-10-18

Bug fixes and stability improvements.

### 1.4.2 — 2026-10-11

Bug fixes and stability improvements.

### 1.4.1 — 2026-10-10

Bug fixes and stability improvements.

## Apps similar to Formula Book

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Tonebook: Hair Color Formulas](https://appshunter.io/ios/app/tonebook-hair-color-formulas/id6800564333) | — | Free | Business |
| [Formula Log: Hair Color Notes](https://appshunter.io/ios/app/formula-log-hair-color-notes/id6789181898) | — | Free | Business |
| [StrandNotes: Hair Formulas](https://appshunter.io/ios/app/strandnotes-hair-formulas/id6785344196) | — | Free | Business |
| [HueBook: Hair Color Formulas](https://appshunter.io/ios/app/huebook-hair-color-formulas/id6780090899) | — | Free | Business |
| [Salon Appointments – ChairBook](https://appshunter.io/ios/app/salon-appointments-chairbook/id6769815041) | — | Free | Business |
| [Color Master Pro Hair Formulas](https://appshunter.io/ios/app/color-master-pro-hair-formulas/id6754916829) | — | Free | Business |

## More apps by Ho Van Dai

- [Line 98 Classic: Amazing Ball](https://appshunter.io/ios/app/line-98-classic-amazing-ball/id6787416787)
- [Memento: Anniversary Countdown](https://appshunter.io/ios/app/memento-anniversary-countdown/id6787834446)
- [Moodee: Mood Tracker](https://appshunter.io/ios/app/moodee-mood-tracker/id6788285478)
- [Shelf Life: Book Journal & TBR](https://appshunter.io/ios/app/shelf-life-book-journal-and-tbr/id6790657863)
- [Plant Journal: Grow Diary](https://appshunter.io/ios/app/plant-journal-grow-diary/id6791094256)
- [Ouch Log: Pain Tracker & Diary](https://appshunter.io/ios/app/ouch-log-pain-tracker-and-diary/id6792059742)

All apps by Ho Van Dai: https://appshunter.io/developer/1572981836

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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 2026-11-12.*