PMI Atom vs MarkBuy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PMI Atom
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The PMI Atom application is used in conjunction with the Atom Environmental Sensor from Power Monitors, Inc. With this application, users can download time-series measurements from their Atoms, take real-time spot measurements and more! The PMI Atom application also allows users to integrate seamlessly with PQ Canvass, PMI's flag-ship time-series analysis platform.
MarkBuy
Easily track, analyze, and manage all your digital subscriptions in one secure place. Get a clear overview of your spending, receive timely renewal reminders, and gain insights into your financial habits with customizable settings and multi-currency support.
- Comprehensive subscription management
- Spending overview and analytics
- Calendar renewal reminders
- Biometric data protection
- Multi-currency support
- iCloud sync across devices
- Smart app store lookup
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MarkBuy — Your all-in-one subscription manager. Track, analyze, and manage all your subscriptions in one place. With smart features and flexible customization, MarkBuy helps you stay in control of your spending — easily, securely, and intuitively. Key Features • Comprehensive Subscription Management Add, edit, and delete digital subscriptions with ease. Customize names, categories, billing cycles, and amounts to match your needs. • Spending Overview View total monthly and yearly subscription costs at a glance to better manage your finances. • Calendar Reminders Visual calendar shows upcoming renewals and payments so you never miss a charge. • Detailed Analytics Understand your spending patterns and discover saving opportunities through visual charts and insights. • Biometric Protection Secure your data with Face ID, Touch ID, or passcode. • Multi-Currency Support Manage subscriptions in multiple currencies or token systems with smart rate conversion. • Payment History Keep track of every payment — clear, complete, and organized. • Customizable Settings Personalize notifications, renewal options, default pages, and more. • iCloud Sync Sync data across devices — manage anywhere, anytime. • Smart App Store Lookup Search for apps directly while adding a subscription, with auto-filled names and icons. • Local Data Storage Your data stays on your device by default. iCloud sync is optional — privacy first. • Clean, Native Interface Designed with iOS in mind — smooth, intuitive, and user-friendly. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: PMI Atom at none against MarkBuy's 4. PMI Atom also leads on update cadence (every 5 days vs fortnightly). On price, 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
Both are free to download. MarkBuy sells 4 in-app purchases, starting at $1.99 per month. PMI Atom asks for nothing beyond the download.
PMI Atom ships an update every 5 days, MarkBuy fortnightly. The most recent releases landed on October 27, 2026 and October 20, 2026 respectively.
| Parameter | PMI Atom | MarkBuy |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (9 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 9 — better |
| Update frequency | Every 5 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 23 MB | 56 MB |
| Age rating | 17+ | 4+ |
| Developer | Power Monitors, Incorporated | 舟 徐 |
In-app purchases
PMI Atom
No in-app purchases
MarkBuy
- Monthly Subscription$1.991 Month
- Quarterly Subscription$3.993 Months
- Annual Subscription$6.991 Year
- MarkBuy 高级功能$6.99









