# Contrigraph vs 20% Tip Calculator

The clearest difference is in-app purchases: 20% Tip Calculator at none against Contrigraph's 1. 20% Tip Calculator also leads on update cadence (every 2 weeks vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Contrigraph sells 1 one-off in-app purchase. 20% Tip Calculator asks for nothing beyond the download.

Contrigraph ships an update every 6 weeks, 20% Tip Calculator every 2 weeks. The most recent releases landed on October 25, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Contrigraph | 20% Tip Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/20-tip-calculator/id6769680069/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 1 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hajime Nakamura](https://appshunter.io/developer/1011217140) | [Jonathan Cho](https://appshunter.io/developer/1896678883) |

## What reviewers say

### Contrigraph

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

Focus on a single habit with a visual year-long tracker. Log your daily progress with five effort levels and receive timely, non-intrusive reminders. Available in English and Japanese with dark mode support.

**Highlights:** Track a single habit, Year-long visual progress strip, Monthly calendar view, Five effort levels for logging, Dedicated button for today's entry, Smart, context-aware notifications

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

**In-app purchases (1)**

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


### 20% Tip Calculator

[App page](https://appshunter.io/ios/app/20-tip-calculator/id6769680069)

Instantly calculate and split bills with custom tip percentages. This app simplifies tipping for locals and travelers in the US, ensuring fair contributions without complex calculations.

**Highlights:** Instant 20% tip calculation, Adjustable tip percentage, Even bill splitting, Simple bill entry

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

**In-app purchases:** none


## Frequently asked questions

### Is Contrigraph free?

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

### Is 20% Tip Calculator free?

20% Tip Calculator is free to download, with no in-app purchases.

### Do Contrigraph or 20% Tip Calculator have ads?

Neither Contrigraph nor 20% Tip Calculator shows ads.

### Which is updated more often, Contrigraph or 20% Tip Calculator?

Contrigraph ships an update every 6 weeks, and 20% Tip Calculator every 2 weeks. Most recently, Contrigraph was updated on October 25, 2026 and 20% Tip Calculator on October 19, 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.*