# Interval Flow vs TEHLIN NExT

The clearest difference is in-app purchases: TEHLIN NExT at none against Interval Flow's 10. TEHLIN NExT also leads on iOS requirement (15.0 vs 18.6). Interval Flow's advantage is update cadence (fortnightly vs every 23 months). On price, ads and device support there is nothing between them.

Both are free to download. Interval Flow sells 10 in-app purchases, starting at $4.99 per 3 months. TEHLIN NExT asks for nothing beyond the download.

Interval Flow ships an update fortnightly, TEHLIN NExT every 23 months. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Interval Flow | TEHLIN NExT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (168 ratings)](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987/reviews)** | — |
| Number of ratings | **168** | — |
| Positive reviews | 48.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 23 months |
| Monetization | Subscription | — |
| Size | 20 MB | 59 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bence Kaposzta](https://appshunter.io/developer/1650069302) | [TEH LIN PROSTHETIC & ORTHOPAEDIC INCORPORATED](https://appshunter.io/developer/1725403438) |

## What reviewers say

### Interval Flow

[App page](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987)

This app revolutionizes fitness routines with deep customization and advanced tracking for various activities like HIIT, Yoga, and CrossFit. It allows users to create, share, and follow personalized workouts with features like color-coded intervals, real-time progress tracking, and voice assistance.

**Highlights:** Color-coded intervals, Customizable circuits, Real-time progress tracking, Voice assist and search, Exercise library, Workout sharing

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Month | $4.99 | per 3 months |
| 1 Month | $9.99 | per month |
| 1 Month, 3 day trial | $9.99 | per month |
| Annual | $14.99 | per year |
| 1 Year discounted | $25.95 | per year |
| 1 Year, 3 day trial | $39.99 | per year |
| 1 Year | $39.99 | per year |
| 1 Year Intro month | $39.99 | per year |
| Free Lifetime subscription | Free | one-time |
| Lifetime | $24.99 | one-time |

**What reviewers like**

- 👍 Nicely designed with good features
- 👍 Unique and brilliantly for keeping fit
- 👍 Simplicity gets it done

**What reviewers complain about**

- 🐛 App crashes on launch
- 🐛 App doesn't remember interval settings
- 🐛 App rearranges workout order
- 🐛 Cannot see questionnaire properly
- 🐛 Robot voice with no visual instructions

**Reported bugs**

- Programs deleted after update
- App crashes when adding a program
- Show/Hide Instructions adds time to interval
- App defaults to unused workout
- Cannot permanently skip to end of timed activity

**Requested features**

- Increase repetitions to 20
- Streamline adding intervals
- Make it possible to hide unused workouts
- Add music integration or option
- Provide visual instructions for moves


### TEHLIN NExT

[App page](https://appshunter.io/ios/app/tehlin-next/id6475913564)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interval Flow free?

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

### Is TEHLIN NExT free?

TEHLIN NExT is free to download, with no in-app purchases.

### Do Interval Flow or TEHLIN NExT have ads?

Neither Interval Flow nor TEHLIN NExT shows ads.

### Which is updated more often, Interval Flow or TEHLIN NExT?

Interval Flow ships an update fortnightly, and TEHLIN NExT every 23 months. Most recently, Interval Flow was updated on October 15, 2026 and TEHLIN NExT on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*