# Formula Conversion vs Noah's Rainbow | Bible Stories

The clearest difference is update cadence: Noah's Rainbow | Bible Stories at fortnightly against Formula Conversion's every 26 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Formula Conversion sells 1 one-off in-app purchase and Noah's Rainbow | Bible Stories sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Formula Conversion ships an update every 26 months, Noah's Rainbow | Bible Stories fortnightly. The most recent releases landed on October 27, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Formula Conversion | Noah's Rainbow | Bible Stories |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/noahs-rainbow-bible-stories/id6739274573/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 40 MB |
| Requires iOS | **14.1** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Janek Soomets](https://appshunter.io/developer/1315295062) | [Noahs Rainbow LLC](https://appshunter.io/developer/1799722025) |

## What reviewers say

### Formula Conversion

[App page](https://appshunter.io/ios/app/formula-conversion/id1586539965)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Formula Conversion | $3.99 | one-time |


### Noah's Rainbow | Bible Stories

[App page](https://appshunter.io/ios/app/noahs-rainbow-bible-stories/id6739274573)

This app offers audio Bible stories for all ages, featuring professional narration and peaceful background music. It includes a wide range of Old and New Testament stories, plus coloring pages for kids. New episodes are added weekly, making it a comprehensive resource for faith-based learning and family devotionals.

**Highlights:** Professionally narrated audio Bible stories, Peaceful background music, 100% Kid-Safe and ad-free, Extensive collection of Old and New Testament stories, Bible coloring pages for kids, New episodes added weekly

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Join the Club(Monthly) | $2.99 | per month |
| Join The Club! (Yearly) | $24.99 | per year |
| Join The Club! (Yearly) | $24.99 | per year |


## Frequently asked questions

### Is Formula Conversion free?

Formula Conversion is free to download, with in-app purchases available.

### Is Noah's Rainbow | Bible Stories free?

Noah's Rainbow | Bible Stories is free to download, with in-app purchases available.

### Do Formula Conversion or Noah's Rainbow | Bible Stories have ads?

Neither Formula Conversion nor Noah's Rainbow | Bible Stories shows ads.

### Which is updated more often, Formula Conversion or Noah's Rainbow | Bible Stories?

Formula Conversion ships an update every 26 months, and Noah's Rainbow | Bible Stories fortnightly. Most recently, Formula Conversion was updated on October 27, 2026 and Noah's Rainbow | Bible Stories on October 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*