# The Book I Wrote vs Planned Experiment

The Book I Wrote and Planned Experiment are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. The Book I Wrote sells 1 one-off in-app purchase and Planned Experiment sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 4 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | The Book I Wrote | Planned Experiment |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Size | 12 MB | 7 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Miroslav Pulik](https://appshunter.io/developer/6800069890) | [Ilya Obraztsov](https://appshunter.io/developer/1499085877) |

## What reviewers say

### The Book I Wrote

[App page](https://appshunter.io/ios/app/the-book-i-wrote/id6801027635)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro | $39.99 | one-time |


### Planned Experiment

[App page](https://appshunter.io/ios/app/planned-experiment/id6804523091)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $17.99 | one-time |


## Frequently asked questions

### Is The Book I Wrote free?

The Book I Wrote is free to download, with in-app purchases available.

### Is Planned Experiment free?

Planned Experiment is free to download, with in-app purchases available.

### Do The Book I Wrote or Planned Experiment have ads?

Neither The Book I Wrote nor Planned Experiment shows ads.

### Which is updated more often, The Book I Wrote or Planned Experiment?

The Book I Wrote ships an update every 4 days, and Planned Experiment every 4 days. Most recently, The Book I Wrote was updated on October 25, 2026 and Planned Experiment on October 25, 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.*