# CalcFlex vs Tip Calculator SDG

The clearest difference is in-app purchases: Tip Calculator SDG at none against CalcFlex's 6. Tip Calculator SDG also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.0). CalcFlex's advantage is ads (none vs shown) and update cadence (every 9 days vs every 12 months). On price there is nothing between them.

Both are free to download. CalcFlex sells 3 one-off in-app purchases. Tip Calculator SDG asks for nothing beyond the download.

CalcFlex ships an update every 9 days, Tip Calculator SDG every 12 months. Both last shipped on October 25, 2026.

## The numbers

| Metric | CalcFlex | Tip Calculator SDG |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 9 days** | Every 12 months |
| Size | 2 MB | 12 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Chiu Loong Ng](https://appshunter.io/developer/1755978644) | [SDG CODE DOO NIS](https://appshunter.io/developer/1343251532) |

## What reviewers say

### CalcFlex

[App page](https://appshunter.io/ios/app/calcflex-calculator/id6520389768)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +3 New Variables | $1.99 | one-time |
| +20 New Equation Slots | $1.99 | one-time |
| +1 New Calculator | $3.99 | one-time |


### Tip Calculator SDG

[App page](https://appshunter.io/ios/app/tip-calculator-sdg/id6741415779)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CalcFlex free?

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

### Is Tip Calculator SDG free?

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

### Do CalcFlex or Tip Calculator SDG have ads?

Tip Calculator SDG shows ads; CalcFlex does not.

### Which is updated more often, CalcFlex or Tip Calculator SDG?

CalcFlex ships an update every 9 days, and Tip Calculator SDG every 12 months. Most recently, CalcFlex was updated on October 25, 2026 and Tip Calculator SDG on October 25, 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.*