# Steadyline vs Stack

The clearest difference is update cadence: Stack at every 3 days against Steadyline's every 9 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Steadyline sells 4 in-app purchases, starting at $7.99 per month and Stack sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Steadyline ships an update every 9 days, Stack every 3 days. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Steadyline | Stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (9 ratings)](https://appshunter.io/ios/app/steadyline-bipolar-tracker/id6763089476/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 70 MB | 9 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Ravi Mishra](https://appshunter.io/developer/1895157347) | [Henry Hinge](https://appshunter.io/developer/6784458312) |

## What reviewers say

### Steadyline

[App page](https://appshunter.io/ios/app/steadyline-bipolar-tracker/id6763089476)

This app helps individuals with bipolar disorder track their moods, symptoms, and medication adherence. It provides visual charts and reports to identify patterns and prepare for discussions with healthcare professionals. Optional AI features offer further insights into logged data.

**Highlights:** Mood and symptom logging, Medication adherence tracking, Sleep duration and quality logging, Pattern analysis charts, Psychiatrist report generation, Optional AI reflection, Educational guides on bipolar disorder

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Steadyline Premium Monthly | $7.99 | per month |
| Steadyline Core | $7.99 | per month |
| Steadyline Core Yearly | $39.99 | per year |
| Steadyline Premium Yearly | $39.99 | per year |


### Stack

[App page](https://appshunter.io/ios/app/stack-supplement-tracker/id6784458310)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Pro | $5.99 | per month |
| Stack Pro | $39.99 | per year |


## Frequently asked questions

### Is Steadyline free?

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

### Is Stack free?

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

### Do Steadyline or Stack have ads?

Neither Steadyline nor Stack shows ads.

### Which is updated more often, Steadyline or Stack?

Steadyline ships an update every 9 days, and Stack every 3 days. Most recently, Steadyline was updated on November 11, 2026 and Stack on November 10, 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.*