Simply Fast vs The Compound
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simply Fast
This minimalist app helps you achieve time-restricted fasting goals with a simple, intuitive interface. Configure fasting start times and durations, and receive timely notifications for your fasting and eating windows. No account or sign-in is required.
- Simple and easy-to-use design
- Customizable fasting start times
- Adjustable fasting durations (12-23 hours)
- Fasting and eating window notifications
- No sign-in or account required
- Privacy-focused, no data collection
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Simply Fast is a beautifully simple, no-frills companion for time-restricted eating. Rebuilt from the ground up for the latest iPhone and Apple Watch, it keeps the same clean, one-glance design while feeling right at home on today's devices. Set your window, glance at your progress, and get on with your day. [Features] • Clean, distraction-free design for iPhone and Apple Watch. • Set your fasting start time to any half hour of the day. • Choose a fasting duration from 12 to 23 hours. • A live progress bar shows your current fasting or eating window, with the time remaining at a glance. • Apple Watch complications for modern watch faces, so your window is always one look away. • A notification at the start of each fasting and eating window. • Your schedule stays in sync across iPhone and Apple Watch. • No sign-in, no account, no ads, and no pop-ups. • Private by design: the app collects nothing and sends us no information. [Important] You should consult your doctor before starting or changing a fasting schedule. Simply Fast supports time-restricted eating only, not full-day fasting such as 5:2, and it does not track or store a history of your fasts. [Feedback] We would love to hear from you. Please reach us through the app support page (https://www.mpathy.tech/contact-us). If you find Simply Fast useful, please tell a friend and leave a rating on the App Store. Your support keeps the app going.
The Compound
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You're already on a peptide protocol. What you need now is a tracker built for it — not another calorie counter. The Compound is built for people on semaglutide, tirzepatide, or retatrutide, whether you're getting pre-filled pens from a telehealth provider or working with compounded peptides. It handles everything generic health apps don't: titration schedules, injection timing, and side effect logging — all offline, all on your device. PROTOCOL ENGINE Set your compound and start date. The app calculates your titration schedule automatically — standard or slow pace — based on published clinical schedules. Every week you'll see your current dose, your next titration date, and what dose comes next. When life happens, you stay in control. Hold your dose for a week if side effects are rough. Titrate early if you're tolerating the current step well. Step back a dose if you need to. Switch between standard and slow titration at any point. When you reach your goal, enter maintenance mode — keep your dose weekly or stretch to bi-weekly injections. INJECTION LOG Tap once to log an injection. The app tracks every dose, timestamps each one, and tells you exactly how many days until your next shot — or flags it if you're overdue. Your full log is chronological, editable, and stays on your device. SIDE EFFECT LOG Log nausea, fatigue, constipation, vomiting, headache, and more — with severity and optional notes. Side effect history is charted alongside your dose progression so you can spot patterns. PROGRESS Weight, body fat, dose progression, and symptom history — charted over time against your protocol timeline. The data lives on your device. WHO IT'S FOR — Telehealth patients on Ozempic, Wegovy, Mounjaro, or Zepbound who want more than a paper schedule. — Self-administering users on compounded peptides who need a precise protocol tracker. — Anyone who wants a clinical-grade tool instead of a wellness app with motivational quotes. Note: retatrutide is Phase 3 and not FDA-approved. The app supports tracking it for research purposes only. The Compound does not provide medical advice. It is a tracking tool for people who already know what they're doing. $7.99/month or $54.99/year. No free tier. Your data stays on your device. Terms of Use: https://compoundprotocol.com/terms
Screenshots
Verdict
The clearest difference is price: The Compound at Free against Simply Fast's $0.99. Simply Fast's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
The Compound is free to download; Simply Fast costs $0.99 up front. The Compound sells 2 in-app purchases, starting at $7.99 per month. Simply Fast asks for nothing beyond the download.
| Parameter | Simply Fast | The Compound |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.5 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, Apple Watch — better | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 2 MB |
| Age rating | 4+ | 17+ |
| Developer | Mpathy Tech | Zach Johnson |
In-app purchases
Simply Fast
No in-app purchases
The Compound
- The Compound Monthly$7.991 Month
- The Compound Annual$54.991 Year
Questions
Is Simply Fast free?
Is The Compound free?
Do Simply Fast or The Compound have ads?
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