Compound vs Calla
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Compound
This workout app simplifies strength training with a single, progressive routine. It automatically tracks your progress, adjusts weights, and includes warm-ups and cool-downs. Log workouts precisely as you perform them, with Apple Watch integration for seamless tracking.
- Automated double progression weight increases
- Automatic warm-up and cool-down routines
- Customizable rep ranges and weight jumps
- Real-time Apple Watch mirroring
- Flexible logging for various exercise types
- Private, on-device data storage
Read full descriptionHide full description
Compound is a workout app with exactly one workout in it. NO MORE BOOKKEEPING Compound runs on double progression, a tried-and-true method for getting stronger. We just handle the bookkeeping. Hit your target reps, and the app bumps the target up for next time. Hit the top of the rep range? The weight goes up (5 lbs for big lifts, 2.5 lbs for accessories) and your reps reset. If you miss a set, just long-press to log what you actually did, and the app holds the weight steady until you're ready. No spreadsheets, no thinking. If you want a slower climb, you can tell the app to require up to five successful sessions before it forces a weight jump. MORE THAN JUST MOVING WEIGHT Every workout starts with an actual warm-up: three minutes of timed cardio, dynamic movements, and ramp-up sets calculated directly from your first working weight. Rest timers kick in automatically between sets. Ten minutes of guided mobility wraps up the day. You can tweak or turn off any of this, but the defaults are designed to give you a complete, balanced program. TRACKS LIKE REAL LIFE Not every exercise fits perfectly into a generic "reps and weight" counter. Tap to log your squats. Run the built-in stopwatch for dead hangs and let it save your PR. Use the countdown for planks. Every exercise is tracked exactly the way you actually do it. LEAVE YOUR PHONE IN YOUR POCKET The Apple Watch app mirrors your session in real time. Log sets, skip rests, and adjust the weight on the bar right from your wrist. Your phone and watch stay perfectly synced, and everything gets sent straight to Apple Health, complete with your heart rate and active calories. YOURS, PRIVATELY No account. No sign-up. Nothing is uploaded to a server that reads your training. Your history is stored on your device, full stop, and you can export the whole of it as a file at any time, subscribed or not. Start by entering the weights you lift today, or start everything at zero and let the progression build. Either way, the next session is always ready. SUBSCRIPTION Compound Standard unlocks the whole app and comes in two terms, monthly and annual, both opening with a 14-day free trial. Prices are shown in your own currency on the subscription screen inside the app before anything is charged. Payment is charged to your Apple Account at confirmation. It renews automatically unless auto-renew is switched off at least 24 hours before the current period ends, and can be managed or cancelled any time in Settings › Apple Account › Subscriptions. Privacy Policy: https://trycompound.cc/privacy Terms of Use: https://trycompound.cc/terms Terms of Use (Apple standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Calla
Read full descriptionHide full description
Calla is a private perimenopause and menopause tracker for iPhone. Keep a daily diary of symptoms, hot flashes, sleep and hormone replacement therapy (HRT). Calla Pro adds insights and PDF reports for your next medical appointment. MADE FOR THIS STAGE • 25+ symptoms with severity, plus your own custom symptoms and notes • One-tap hot flash log with time of day, night sweats and sleep • Works whether your periods are regular, irregular or gone – including after a hysterectomy or with an IUD • Tracks the gap since your last period and flags bleeding after 12 months HRT, PROPERLY • Patches, gels, sprays, tablets, pessaries, testosterone and more • Daily, twice-weekly, weekly and cyclical schedules with reminders that respect Focus modes • Log dose changes and see how your symptoms compared before and after SEE THE PATTERNS • Calendar heatmap and 7/30/90-day trends • Which triggers (alcohol, caffeine, stress, poor sleep) go with worse days • Adherence vs symptoms, hot flash frequency by time of day BRING PROOF TO YOUR APPOINTMENT • PDF report with charts, your HRT regimen and adherence, bleeding pattern, labs and your questions • Share from the app or print PRIVATE BY DESIGN • No account, no sign-up, no email • Data stays on your iPhone; optional iCloud backup and full export (CSV, JSON, PDF) • Optional Face ID lock • Writes symptoms to Apple Health and imports your cycle history Daily logging, medication reminders and JSON/CSV exports are available without a subscription. Calla Pro unlocks Insights and creation of PDF reports. Calla Pro is available as a subscription: $39.99/year after a 7-day free trial, or $7.99/month. Payment is charged to your Apple ID account. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in Settings › Apple ID › Subscriptions. Calla is a tracking tool, not a medical device. It does not diagnose or treat conditions. Always talk to your healthcare provider about symptoms and treatment. Privacy Policy: https://callatracker.app/privacy Terms of Use: https://callatracker.app/terms Support: https://callatracker.app/support
Screenshots
Verdict
Compound and Calla 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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Compound sells 3 in-app purchases, starting at $4.99 per month and Calla sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
Compound ships an update weekly, Calla every 4 days. Both last shipped on October 2, 2026.
| Parameter | Compound | Calla |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 17 MB | 69 MB |
| Age rating | 4+ | 12+ |
| Developer | SCOTT BERKLEY SHUMAKER | Arman Malkhasyan |
In-app purchases
Compound
- Progression · Monthly14 Days trial$4.991 Month
- Progression · Annual14 Days trial$29.991 Year
- Progression · Lifetime$99.99
Calla
- Calla Pro - Monthly$7.991 Month
- Calla Pro - Yearly7 Days trial$39.991 Year





