# Plier vs UniSum

The clearest difference is in-app purchases: UniSum at none against Plier's 2. Plier's advantage is update cadence (weekly vs every 2 months) and iOS requirement (15.0 vs 18.2). On price, ads and device support there is nothing between them.

Both are free to download. Plier sells 2 in-app purchases, starting at $6.99 per 7 days. UniSum asks for nothing beyond the download.

Plier ships an update weekly, UniSum every 2 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Plier | UniSum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (15 ratings)](https://appshunter.io/ios/app/plier-car-maintenance-tracker/id6742336175/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 54 MB | 5 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heap Labs LLC](https://appshunter.io/developer/840318089) | [Omer Yasir Onal](https://appshunter.io/developer/1797082029) |

## What reviewers say

### Plier

[App page](https://appshunter.io/ios/app/plier-car-maintenance-tracker/id6742336175)

Transform your iPhone into an AI-powered car diagnostic tool. Connect to your vehicle via an OBD2 device to understand its health, diagnose issues, and estimate repair costs.

**Highlights:** AI-driven diagnostic reports, Real-time OBD2 data and graphs, Check engine light insights, Repair cost estimation, ELM327 Bluetooth compatibility, Troubleshoot engine codes

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Weekly) | $6.99 | per 7 days |
| Pro ( 1 Year ) | $49.99 | per year |


### UniSum

[App page](https://appshunter.io/ios/app/unisum/id6742401580)

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

**In-app purchases:** none


## Frequently asked questions

### Is Plier free?

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

### Is UniSum free?

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

### Do Plier or UniSum have ads?

Neither Plier nor UniSum shows ads.

### Which is updated more often, Plier or UniSum?

Plier ships an update weekly, and UniSum every 2 months. Most recently, Plier was updated on November 4, 2026 and UniSum on October 30, 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.*