# IntervalTimer Duo vs Circuit Timer

IntervalTimer Duo and Circuit Timer 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. IntervalTimer Duo sells 1 one-off in-app purchase and Circuit Timer sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

IntervalTimer Duo ships an update every 2 weeks, Circuit Timer monthly. The most recent releases landed on September 7, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | IntervalTimer Duo | Circuit Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Size | 10 MB | 7 MB |
| Requires iOS | 26.1 | **26.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [kosuke konuma](https://appshunter.io/developer/1767116232) | [Lawman Services, LLC](https://appshunter.io/developer/446643752) |

## What reviewers say

### IntervalTimer Duo

[App page](https://appshunter.io/ios/app/intervaltimer-duo/id6753626424)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


### Circuit Timer

[App page](https://appshunter.io/ios/app/circuit-timer/id6759834943)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Core | $2.99 | one-time |
| Pro | $4.99 | one-time |


## Frequently asked questions

### Is IntervalTimer Duo free?

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

### Is Circuit Timer free?

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

### Do IntervalTimer Duo or Circuit Timer have ads?

Neither IntervalTimer Duo nor Circuit Timer shows ads.

### Which is updated more often, IntervalTimer Duo or Circuit Timer?

IntervalTimer Duo ships an update every 2 weeks, and Circuit Timer monthly. Most recently, IntervalTimer Duo was updated on September 7, 2026 and Circuit Timer on September 3, 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.*