# Undercurrent vs Symptom Log

Undercurrent and Symptom Log are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Undercurrent sells 1 one-off in-app purchase and Symptom Log sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Undercurrent ships an update weekly, Symptom Log every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Undercurrent | Symptom Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/symptom-log-symptom-tracker/id6759680681/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Freemium |
| Size | 73 MB | 43 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Lloyd Rowat](https://appshunter.io/developer/1166734628) | [AlgoSoft Technologies Limited](https://appshunter.io/developer/1799406712) |

## 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 |


### Symptom Log

[App page](https://appshunter.io/ios/app/symptom-log-symptom-tracker/id6759680681)

This app helps individuals manage chronic conditions by logging daily symptoms, moods, and potential triggers. It provides insights into trends and allows for easy sharing of health data with doctors. The app focuses on private, on-device storage for user peace of mind.

**Highlights:** Daily symptom logging, Mood tracking, Trigger identification, Doctor reports (PDF), Data export (CSV), Customizable symptom list, On-device data storage

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $2.99 | per 7 days |
| Annual Plan | $39.99 | per year |
| Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is Undercurrent free?

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

### Is Symptom Log free?

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

### Do Undercurrent or Symptom Log have ads?

Neither Undercurrent nor Symptom Log shows ads.

### Which is updated more often, Undercurrent or Symptom Log?

Undercurrent ships an update weekly, and Symptom Log every 2 weeks. Most recently, Undercurrent was updated on October 24, 2026 and Symptom Log 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.*