# Techno Rainbow vs BidWise by Eridan

The clearest difference is update cadence: BidWise by Eridan at every 4 weeks against Techno Rainbow's every 2 months. On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Techno Rainbow ships an update every 2 months, BidWise by Eridan every 4 weeks. The most recent releases landed on October 17, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Techno Rainbow | BidWise by Eridan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bidwise-by-eridan/id6504484837/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free | Free |
| Size | 3 MB | 33 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ShenZhen Lenze Technology Co,.Ltd.](https://appshunter.io/developer/1190864538) | [Kostiantyn Ichko](https://appshunter.io/developer/1752462494) |

## What reviewers say

### Techno Rainbow

[App page](https://appshunter.io/ios/app/techno-rainbow/id6453409883)

Control your car's interior lighting and air freshening systems. Customize lighting modes, colors, and brightness, and manage scent intensity and air purification for a personalized driving experience.

**Highlights:** Car interior lighting control, Customizable lighting modes and colors, Rainbow lighting effect, Music synchronization for lighting, Air freshening and ionization control, Adjustable scent intensity

**In-app purchases:** none


### BidWise by Eridan

[App page](https://appshunter.io/ios/app/bidwise-by-eridan/id6504484837)

This tool streamlines U.S. online auto auctions by providing instant vehicle data, lot analysis, and budget estimation. It helps users make faster, more profitable decisions when buying cars at auction.

**Highlights:** Instant vehicle data access, Lot analysis and budget estimation, Seller type and reserve price visibility, VIN decoding, Bid placement and management, Favorite lot tracking, Invoice management

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

**In-app purchases:** none


## Frequently asked questions

### Is Techno Rainbow free?

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

### Is BidWise by Eridan free?

BidWise by Eridan is free to download, with no in-app purchases.

### Do Techno Rainbow or BidWise by Eridan have ads?

Neither Techno Rainbow nor BidWise by Eridan shows ads.

### Which is updated more often, Techno Rainbow or BidWise by Eridan?

Techno Rainbow ships an update every 2 months, and BidWise by Eridan every 4 weeks. Most recently, Techno Rainbow was updated on October 17, 2026 and BidWise by Eridan 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.*