# Threshold vs SpiritTrace

Threshold and SpiritTrace are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support 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. Threshold sells 1 one-off in-app purchase and SpiritTrace sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Threshold | SpiritTrace |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spirittrace-ghost-emf-meter/id6799577491/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Monetization | — | Subscription |
| Size | 4 MB | 16 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Brandon Romero](https://appshunter.io/developer/1891387344) | [617SW, LLC](https://appshunter.io/developer/6791188705) |

## What reviewers say

### Threshold

[App page](https://appshunter.io/ios/app/threshold-spirit-box-lab/id6783039005)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spirit Box Lab Pro | $9.99 | one-time |


### SpiritTrace

[App page](https://appshunter.io/ios/app/spirittrace-ghost-emf-meter/id6799577491)

This app uses your iPhone's magnetometer to detect and display magnetic field changes in real-time. Explore different visual outputs, capture evidence clips, and enhance your paranormal investigations with optional audio and haptic feedback.

**Highlights:** Real-time magnetic field detection, Four sensor-driven display modes, 15-second evidence clip export, Geiger-style audio feedback, Haptic feedback intensification, Built for paranormal experiments

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SpiritTrace EMF Pro Monthly | $3.99 | per month |
| SpiritTrace EMF Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is Threshold free?

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

### Is SpiritTrace free?

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

### Do Threshold or SpiritTrace have ads?

Neither Threshold nor SpiritTrace shows ads.

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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.*