# Super CDI vs Callstack

The clearest difference is in-app purchases: Super CDI at none against Callstack's 2. Super CDI also leads on iOS requirement (13.0 vs 16.4). Callstack's advantage is update cadence (every 4 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Callstack sells 2 in-app purchases, starting at $5.99 per month. Super CDI asks for nothing beyond the download.

Super CDI ships an update every 3 months, Callstack every 4 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Super CDI | Callstack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 31 MB | 57 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [ECU=SHOP](https://appshunter.io/developer/1389703440) | [Leon Gremer](https://appshunter.io/developer/6819024923) |

## What reviewers say

### Super CDI

[App page](https://appshunter.io/ios/app/super-cdi/id6751292922)

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

**In-app purchases:** none


### Callstack

[App page](https://appshunter.io/ios/app/callstack-cold-call-lists/id6819024921)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Callstack Pro Monthly | $5.99 | per month |
| Callstack Pro Yearly | $59.99 | per year |


## Frequently asked questions

### Is Super CDI free?

Super CDI is free to download, with no in-app purchases.

### Is Callstack free?

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

### Do Super CDI or Callstack have ads?

Neither Super CDI nor Callstack shows ads.

### Which is updated more often, Super CDI or Callstack?

Super CDI ships an update every 3 months, and Callstack every 4 days. Most recently, Super CDI was updated on October 28, 2026 and Callstack on October 31, 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.*