# JBT PRoLOG vs Trueline

The clearest difference is in-app purchases: JBT PRoLOG at none against Trueline's 1. JBT PRoLOG also leads on ads (none vs shown) and device support (3 vs 1). Trueline's advantage is update cadence (daily vs every 3 months). On price there is nothing between them.

Both are free to download. Trueline sells 1 one-off in-app purchase. JBT PRoLOG asks for nothing beyond the download.

JBT PRoLOG ships an update every 3 months, Trueline daily. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | JBT PRoLOG | Trueline |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Daily** |
| Size | 33 MB | 12 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ESYS Gesellschaft fuer Elektronische Systemtechnik . Hard- und Software mbH](https://appshunter.io/developer/917295043) | [Edge Analytics s.r.o.](https://appshunter.io/developer/1867465595) |

## What reviewers say

### JBT PRoLOG

[App page](https://appshunter.io/ios/app/jbt-prolog/id1401983412)

**Features:** macOS Compatibility

**In-app purchases:** none


### Trueline

[App page](https://appshunter.io/ios/app/trueline-level-tool/id6800032249)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trueline Pro | $6.99 | one-time |


## Frequently asked questions

### Is JBT PRoLOG free?

JBT PRoLOG is free to download, with no in-app purchases.

### Is Trueline free?

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

### Do JBT PRoLOG or Trueline have ads?

Trueline shows ads; JBT PRoLOG does not.

### Which is updated more often, JBT PRoLOG or Trueline?

JBT PRoLOG ships an update every 3 months, and Trueline daily. Most recently, JBT PRoLOG was updated on October 26, 2026 and Trueline on October 24, 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.*