# Soso vs Flow

The clearest difference is in-app purchases: Flow at none against Soso's 5. Soso's advantage is device support (4 vs 1) and iOS requirement (15.1 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Soso sells 5 in-app purchases, starting at $9.99 per month. Flow asks for nothing beyond the download.

Soso ships an update every 9 days, Flow every 3 weeks. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Soso | Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (854 ratings)](https://appshunter.io/ios/app/soso-first-period-tracker/id6757295825/reviews)** | — |
| Number of ratings | **854** | — |
| Positive reviews | 92.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 77 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Beyond Analytics Ltda](https://appshunter.io/developer/1707208777) | [拥军 刘](https://appshunter.io/developer/1896777340) |

## What reviewers say

### Soso

[App page](https://appshunter.io/ios/app/soso-first-period-tracker/id6757295825)

This app helps young girls understand puberty and track their menstrual cycles. It provides age-appropriate information, predicts the first period, and logs symptoms and moods without pressure.

**Highlights:** Predicts first period arrival, Tracks puberty stages, Logs cycle flow and spotting, Records moods and symptoms, Provides age-appropriate explanations, Offers daily check-ins and prompts, Visual calendar and history view

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Soso Plus: Monthly | $9.99 | per month |
| Soso Plus: Monthly | $9.99 | per month |
| Soso Plus: Yearly | $49.99 | per year |
| Soso Plus: Yearly | $49.99 | per year |
| First Period Prediction | $9.99 | one-time |


### Flow

[App page](https://appshunter.io/ios/app/flow-period-tracker/id6791552767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Soso free?

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

### Is Flow free?

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

### Do Soso or Flow have ads?

Neither Soso nor Flow shows ads.

### Which is updated more often, Soso or Flow?

Soso ships an update every 9 days, and Flow every 3 weeks. Most recently, Soso was updated on November 9, 2026 and Flow on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*