# Undercurrent vs Flarely

The clearest difference is update cadence: Undercurrent at weekly against Flarely's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Undercurrent sells 1 one-off in-app purchase and Flarely sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Undercurrent ships an update weekly, Flarely every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Undercurrent | Flarely |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 73 MB | 66 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Lloyd Rowat](https://appshunter.io/developer/1166734628) | [Mouemen Derbass](https://appshunter.io/developer/1888327322) |

## What reviewers say

### Undercurrent

[App page](https://appshunter.io/ios/app/undercurrent-symptom-log/id6759209174)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Undercurrent Health: Pro | $19.99 | one-time |


### Flarely

[App page](https://appshunter.io/ios/app/flarely-symptom-tracker/id6761229209)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flarely Premium | $4.99 | per month |
| Flarely Premium | $29.99 | per year |
| Flarely Premium Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Undercurrent free?

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

### Is Flarely free?

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

### Do Undercurrent or Flarely have ads?

Neither Undercurrent nor Flarely shows ads.

### Which is updated more often, Undercurrent or Flarely?

Undercurrent ships an update weekly, and Flarely every 3 weeks. Most recently, Undercurrent was updated on October 24, 2026 and Flarely on October 24, 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.*