COMPARE
Ischys compared with Hevy and Strong
Checked: 13 October 2026
The short version: all three log sets, reps and rest timers. Ischys differs in three ways. It is free with no paid tier, it is open source, and your training log stays on your phone, with no Ischys server holding a copy.
Every statement about Hevy and Strong below comes from that company's own website, help centre or App Store listing, linked in the sources. Prices are the United States App Store prices in US dollars and vary by region. If you are choosing between them, read their pages too.
| Ischys | Hevy | Strong | |
|---|---|---|---|
| Price | Free. There is no paid tier. | Free version. Hevy Pro is listed at $2.99 or $3.99 a month, $23.99 a year or $74.99 for lifetime.[1] | Free version. Strong PRO is $4.99 a month or $29.99 a year; the listing also shows a one-time "Strong PRO Forever" purchase at $79.99 and at $99.99.[8] |
| Limits on the free version | None. | 4 routines, 7 custom exercises and 3 months of statistics history. Body measurements other than weight and waist need Pro.[2][5] | 3 custom routines; unlimited workouts can be saved.[8] Access to all charts, the plate calculator, the warm-up calculator and body-part measurements are listed as PRO features.[9] |
| Where your workouts are stored | On your phone. Ischys has no server. | On Hevy's servers.[3] | On Strong's servers, in the United States and other countries.[10][11] |
| Account | None. | Workouts are saved to your Hevy profile.[3] | Users are prompted to sign up before using the app.[10] |
| Source code | Open source under the MIT licence, on GitHub. | Proprietary: the terms grant only a "limited, non-exclusive, nontransferable license" to use the app.[4] | Proprietary: the terms call the service "the exclusive property of Strong Fitness PTE. Ltd. and its licensors".[12] |
| Platforms | iPhone and Apple Watch. Android is in closed testing on Google Play; the Wear OS app is awaiting Google's review. Neither is public yet. | iPhone, iPad, Android, web browser, Apple Watch and Wear OS.[1][5] | iPhone, Android and Apple Watch.[13] |
| Lock Screen Live Activity | Yes. | Yes.[1] | Yes, for rest timers.[8] |
| Apple Health | Yes. | Yes.[1] | Yes.[14] |
| Export | CSV and JSON. | CSV.[6] | CSV.[15] |
| Import | A workout CSV, or an Ischys JSON export. | CSV files exported from Strong.[7] | Exported files cannot be imported back.[15] |
| Ads | None. | None.[1] | None.[16] |
Where Hevy and Strong are ahead
- Android today. Both have public Android apps.[5][13] Ischys for Android is still in closed testing.
- More platforms. Hevy also runs in a web browser, on iPad and on Wear OS.[1][5]
- History that follows your account. Because both keep your workouts on their servers, your log is there when you sign in on a new device.[3][5][10] Ischys has no sync: your data moves with your normal device backup, or with an export.
Where Ischys is different
- Nothing to pay for. Every feature is in the free app, including routines, charts, personal records, the Apple Watch app and the Live Activity. There are no limits to unlock.
- Your data stays with you. Workouts are rows in a database on your phone. There is no account and no server, so Ischys never holds a copy of your data.
- You can read the code. The whole app is on GitHub under the MIT licence, so the privacy claims can be checked instead of trusted.
Moving your history
Both Hevy and Strong can export your workouts as a CSV file.[6][15] Ischys imports a workout CSV with one row per set and recognises the common column names. If a file does not import cleanly, open an issue with its header row and it will be looked at. You can take your workout history back out of Ischys as CSV or JSON at any time.
Sources
All pages were read on 13 October 2026.
- Hevy, App Store listing (United States): https://apps.apple.com/us/app/hevy-workout-tracker-gym-log/id1458862350
- Hevy help centre, switching from Pro to the free version: https://help.hevyapp.com/hc/en-us/articles/38279350428695-What-will-happen-to-my-account-if-I-switch-from-Pro-to-the-free-version
- Hevy help centre, uninstalling and reinstalling: https://help.hevyapp.com/hc/en-us/articles/38223672272791-What-will-happen-to-my-information-if-I-uninstall-and-reinstall-the-Hevy-app
- Hevy, terms and conditions: https://www.hevyapp.com/legal/terms-and-conditions/
- Hevy help centre, features guide: https://help.hevyapp.com/hc/en-us/articles/33106320824727-Everything-You-Need-to-Know-About-the-Hevy-App-2026-Features-Guide
- Hevy help centre, exporting your data: https://help.hevyapp.com/hc/en-us/articles/43708290987415-Exporting-Your-Data-from-Hevy
- Hevy help centre, importing CSV files: https://help.hevyapp.com/hc/en-us/articles/38001424401943-How-to-Import-Strong-App-CSV-Files-and-Export-Your-Data-in-Hevy
- Strong, App Store listing (United States): https://apps.apple.com/us/app/strong-workout-tracker-gym-log/id464254577
- Strong help centre, Strong PRO: https://help.strongapp.io/article/132-strong-pro
- Strong help centre, Strong account: https://help.strongapp.io/article/143-strong-account
- Strong, privacy policy: https://help.strongapp.io/article/232-privacy-policy
- Strong, terms of service: https://help.strongapp.io/article/179-strong-terms-of-service
- Strong, website: https://www.strong.app/
- Strong help centre, sync with Apple Health: https://help.strongapp.io/article/147-sync-with-apple-health
- Strong help centre, export workout data: https://help.strongapp.io/article/235-export-workout-data
- Strong help centre, what is Strong: https://help.strongapp.io/article/228-what-is-strong
Corrections
Ischys is an independent project. It is not affiliated with, endorsed by or connected to Hevy or Strong, and those names belong to their respective owners. Apps change: if anything on this page is out of date or wrong, open an issue and it will be corrected.