# Custom Thoughts vs Big Data Knowledge Test

The clearest difference is in-app purchases: Custom Thoughts at none against Big Data Knowledge Test's 2. Custom Thoughts also leads on update cadence (every 3 days vs every 3 months) and device support (4 vs 1). On price and ads there is nothing between them.

Both are free to download. Big Data Knowledge Test sells 2 in-app purchases, starting at $13.99 per month. Custom Thoughts asks for nothing beyond the download.

Custom Thoughts ships an update every 3 days, Big Data Knowledge Test every 3 months. The most recent releases landed on June 8, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Custom Thoughts | Big Data Knowledge Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (7 ratings)](https://appshunter.io/ios/app/custom-thoughts/id1582733520/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 months |
| Monetization | Free | — |
| Size | 4 MB | 9 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Caleb Greer](https://appshunter.io/developer/1582708638) | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) |

## What reviewers say

### Custom Thoughts

[App page](https://appshunter.io/ios/app/custom-thoughts/id1582733520)

This app provides a personalized space for self-expression and emotional exploration through journaling. It offers extensive customization options and a unique approach to personal reflection.

**Highlights:** Personalized journaling, Emotional exploration, Customization options, Self-expression tools, Playful secrets feature

**In-app purchases:** none


### Big Data Knowledge Test

[App page](https://appshunter.io/ios/app/big-data-knowledge-test/id6740737722)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly subscription | $13.99 | per month |
| Lifetime version | $24.99 | one-time |


## Frequently asked questions

### Is Custom Thoughts free?

Custom Thoughts is free to download, with no in-app purchases.

### Is Big Data Knowledge Test free?

Big Data Knowledge Test is free to download, with in-app purchases available.

### Do Custom Thoughts or Big Data Knowledge Test have ads?

Neither Custom Thoughts nor Big Data Knowledge Test shows ads.

### Which is updated more often, Custom Thoughts or Big Data Knowledge Test?

Custom Thoughts ships an update every 3 days, and Big Data Knowledge Test every 3 months. Most recently, Custom Thoughts was updated on June 8, 2026 and Big Data Knowledge Test on September 27, 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.*