# Contrigraph vs EVA Clock Nixie

The clearest difference is in-app purchases: EVA Clock Nixie at none against Contrigraph's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Contrigraph sells 1 one-off in-app purchase. EVA Clock Nixie asks for nothing beyond the download.

Contrigraph ships an update every 6 days, EVA Clock Nixie every 5 days. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Contrigraph | EVA Clock Nixie |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 5 days** |
| Size | 10 MB | 5 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Hajime Nakamura](https://appshunter.io/developer/1011217140) | [Futoshi Ebata](https://appshunter.io/developer/1896516461) |

## What reviewers say

### Contrigraph

[App page](https://appshunter.io/ios/app/contrigraph-habit-tracker/id6612007595)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### EVA Clock Nixie

[App page](https://appshunter.io/ios/app/eva-clock-nixie/id6794831211)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Contrigraph free?

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

### Is EVA Clock Nixie free?

EVA Clock Nixie is free to download, with no in-app purchases.

### Do Contrigraph or EVA Clock Nixie have ads?

Neither Contrigraph nor EVA Clock Nixie shows ads.

### Which is updated more often, Contrigraph or EVA Clock Nixie?

Contrigraph ships an update every 6 days, and EVA Clock Nixie every 5 days. Most recently, Contrigraph was updated on October 6, 2026 and EVA Clock Nixie on October 15, 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.*