# TET LITHIUM vs BigRig ELD

The clearest difference is update cadence: BigRig ELD at every 2 months against TET LITHIUM's every 32 months. TET LITHIUM's advantage is iOS requirement (9.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TET LITHIUM ships an update every 32 months, BigRig ELD every 2 months. The most recent releases landed on November 7, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | TET LITHIUM | BigRig ELD |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 2 months** |
| Size | 7 MB | 83 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [宇文 钟](https://appshunter.io/developer/1541529609) | [Radius Limited](https://appshunter.io/developer/953051301) |

## What reviewers say

### TET LITHIUM

[App page](https://appshunter.io/ios/app/tet-lithium/id1542310415)

**Features:** macOS Compatibility

**In-app purchases:** none


### BigRig ELD

[App page](https://appshunter.io/ios/app/bigrig-eld/id6747066986)

**In-app purchases:** none


## Frequently asked questions

### Is TET LITHIUM free?

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

### Is BigRig ELD free?

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

### Do TET LITHIUM or BigRig ELD have ads?

Neither TET LITHIUM nor BigRig ELD shows ads.

### Which is updated more often, TET LITHIUM or BigRig ELD?

TET LITHIUM ships an update every 32 months, and BigRig ELD every 2 months. Most recently, TET LITHIUM was updated on November 7, 2026 and BigRig ELD on November 10, 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.*