# Helix Angle Calculator vs Lock Tess

The clearest difference is in-app purchases: Helix Angle Calculator at none against Lock Tess's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Lock Tess sells 1 one-off in-app purchase. Helix Angle Calculator asks for nothing beyond the download.

Helix Angle Calculator ships an update weekly, Lock Tess every 2 weeks. The most recent releases landed on October 28, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Helix Angle Calculator | Lock Tess |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lock-tess/id6762159918/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 41 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 9+ |
| Developer | [SmiCut AB](https://appshunter.io/developer/1813477031) | [Damian McGreevy](https://appshunter.io/developer/1893167989) |

## What reviewers say

### Helix Angle Calculator

[App page](https://appshunter.io/ios/app/helix-angle-calculator/id6745720275)

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

**In-app purchases:** none


### Lock Tess

[App page](https://appshunter.io/ios/app/lock-tess/id6762159918)

Enhance your car's lock sound with a variety of monstrous and satisfying audio options. Test with free sounds, then unlock a vast library and import your own custom audio files. Organize, share, and sync your sounds across all your devices with a single, one-time purchase.

**Highlights:** Over 30 built-in sound effects, Import custom audio files (MP3, WAV, M4A, AIFF, FLAC), Sound trimming and selection, Organize sounds with search, categories, and favorites, iCloud Sync across iPhone, iPad, and Mac, One-time purchase, no subscription

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lock Tess Premium | $2.99 | one-time |


## Frequently asked questions

### Is Helix Angle Calculator free?

Helix Angle Calculator is free to download, with no in-app purchases.

### Is Lock Tess free?

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

### Do Helix Angle Calculator or Lock Tess have ads?

Neither Helix Angle Calculator nor Lock Tess shows ads.

### Which is updated more often, Helix Angle Calculator or Lock Tess?

Helix Angle Calculator ships an update weekly, and Lock Tess every 2 weeks. Most recently, Helix Angle Calculator was updated on October 28, 2026 and Lock Tess on October 17, 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.*