# 034SPI vs Calendus

The clearest difference is in-app purchases: 034SPI at none against Calendus's 4. 034SPI also leads on iOS requirement (12.2 vs 15.1). Calendus's advantage is update cadence (every 5 days vs every 2 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Calendus sells 4 in-app purchases, starting at $12.00 per month. 034SPI asks for nothing beyond the download.

034SPI ships an update every 2 weeks, Calendus every 5 days. The most recent releases landed on October 7, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 034SPI | Calendus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (42 ratings)](https://appshunter.io/ios/app/034spi/id6468930588/reviews)** | — |
| Number of ratings | **42** | — |
| Positive reviews | 55.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 124 MB | 58 MB |
| Requires iOS | **12.2** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [034motorsport Industries, LLC](https://appshunter.io/developer/1699254218) | [Carlos Gasperi Ramirez](https://appshunter.io/developer/1883109349) |

## What reviewers say

### 034SPI

[App page](https://appshunter.io/ios/app/034spi/id6468930588)

This app allows users to flash their car's ECU/TCU, change fuel maps, and configure live data displays. It also provides diagnostic tools like reading and clearing DTC codes. Compatible with Dynamic+ ECU/TCU tunes and the Dynamic+ End User Flashing Dongle.

**Highlights:** Flash ECU/TCU tunes, Change fuel octane/transmission files, Configure live data displays, High-speed data logging, Read & clear DTC codes, Perform adaptations/recalibrations

**Features:** macOS Compatibility

**In-app purchases:** none


### Calendus

[App page](https://appshunter.io/ios/app/calendus/id6760194897)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calendus Monthly | $12.00 | per month |
| Calendus Pro Monthly | $25.00 | per month |
| Calendus Yearly | $119.99 | per year |
| Calendus Pro Yearly | $250.00 | per year |


## Frequently asked questions

### Is 034SPI free?

034SPI is free to download, with no in-app purchases.

### Is Calendus free?

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

### Do 034SPI or Calendus have ads?

Neither 034SPI nor Calendus shows ads.

### Which is updated more often, 034SPI or Calendus?

034SPI ships an update every 2 weeks, and Calendus every 5 days. Most recently, 034SPI was updated on October 7, 2026 and Calendus on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*