# SIDM vs Flashback by Alfastack

The clearest difference is in-app purchases: SIDM at none against Flashback by Alfastack's 4. SIDM also leads on update cadence (weekly vs every 2 months) and iOS requirement (9.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Flashback by Alfastack sells 4 one-off in-app purchases. SIDM asks for nothing beyond the download.

SIDM ships an update weekly, Flashback by Alfastack every 2 months. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SIDM | Flashback by Alfastack |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | — | Free |
| Size | 68 MB | 50 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Confederation of Indian Industry (CII)](https://appshunter.io/developer/835573828) | [AlfaStack Solution Private Limited](https://appshunter.io/developer/1827885325) |

## What reviewers say

### SIDM

[App page](https://appshunter.io/ios/app/sidm/id1506379689)

**In-app purchases:** none


### Flashback by Alfastack

[App page](https://appshunter.io/ios/app/flashback-by-alfastack/id6757260620)

This app helps you manage professional contacts and nurture your network with an intuitive interface. Easily organize, update, and interact with your connections to build stronger business relationships.

**Highlights:** Contact organization, Professional relationship management, Network interaction tools, Intuitive interface, Seamless updates

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credit 10 | $0.99 | one-time |
| Credit 50 | $0.99 | one-time |
| Credit 100 | $1.99 | one-time |
| Credit 250 | $4.99 | one-time |


## Frequently asked questions

### Is SIDM free?

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

### Is Flashback by Alfastack free?

Flashback by Alfastack is free to download, with in-app purchases available.

### Do SIDM or Flashback by Alfastack have ads?

Neither SIDM nor Flashback by Alfastack shows ads.

### Which is updated more often, SIDM or Flashback by Alfastack?

SIDM ships an update weekly, and Flashback by Alfastack every 2 months. Most recently, SIDM was updated on October 8, 2026 and Flashback by Alfastack on October 7, 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.*