# Interval Flow vs Anchor

Interval Flow and Anchor 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. Interval Flow sells 1 one-off in-app purchase and Anchor sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Interval Flow ships an update every 2 weeks, Anchor every 3 weeks. The most recent releases landed on October 27, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Interval Flow | Anchor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/anchor-stress-awareness/id6754856656/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | — | Subscription |
| Size | 8 MB | 71 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Tegyaan](https://appshunter.io/developer/1711584632) | [Contextual North](https://appshunter.io/developer/1850540521) |

## What reviewers say

### Interval Flow

[App page](https://appshunter.io/ios/app/interval-flow/id6469113776)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multiple Programs | $3.99 | one-time |


### Anchor

[App page](https://appshunter.io/ios/app/anchor-stress-awareness/id6754856656)

This app uses Apple Watch data to provide real-time nudges, helping you recognize and manage rising stress before it impacts your focus or reactions. It tracks stress patterns and recovery over time, offering insights into emotional triggers and body responses.

**Highlights:** Real-time stress detection, Gentle haptic nudges, Daily Calm Score tracking, Stress and recovery pattern analysis, Emotional trigger identification, Privacy-first design

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart Monthly | $6.99 | per month |
| Smart Yearly | $59.99 | per year |


## Frequently asked questions

### Is Interval Flow free?

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

### Is Anchor free?

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

### Do Interval Flow or Anchor have ads?

Neither Interval Flow nor Anchor shows ads.

### Which is updated more often, Interval Flow or Anchor?

Interval Flow ships an update every 2 weeks, and Anchor every 3 weeks. Most recently, Interval Flow was updated on October 27, 2026 and Anchor on November 5, 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.*