# Relationship Decoder vs STEM FLEX

The clearest difference is in-app purchases: STEM FLEX at none against Relationship Decoder's 3. STEM FLEX also leads on update cadence (every 5 days vs every 7 months) and iOS requirement (14.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. Relationship Decoder sells 3 in-app purchases, starting at $11.99 per month. STEM FLEX asks for nothing beyond the download.

Relationship Decoder ships an update every 7 months, STEM FLEX every 5 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Relationship Decoder | STEM FLEX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 days** |
| Size | 38 MB | 30 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Laurent Bottigliengo](https://appshunter.io/developer/1233984041) | [FableVision, INC](https://appshunter.io/developer/330019981) |

## What reviewers say

### Relationship Decoder

[App page](https://appshunter.io/ios/app/relationship-decoder/id1444353072)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $11.99 | per month |
| Perform 1 relationship Study | $5.99 | one-time |
| Unlimited Access | $299.99 | one-time |


### STEM FLEX

[App page](https://appshunter.io/ios/app/stem-flex/id6744830195)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Relationship Decoder free?

Relationship Decoder is free to download, with in-app purchases available.

### Is STEM FLEX free?

STEM FLEX is free to download, with no in-app purchases.

### Do Relationship Decoder or STEM FLEX have ads?

Neither Relationship Decoder nor STEM FLEX shows ads.

### Which is updated more often, Relationship Decoder or STEM FLEX?

Relationship Decoder ships an update every 7 months, and STEM FLEX every 5 days. Most recently, Relationship Decoder was updated on October 26, 2026 and STEM FLEX on October 28, 2026.

---

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