Call Deck vs Altos
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Call Deck
Organize contacts into shareable groups called "Decks." Choose to make your Decks public or private, inviting specific users to private groups. Easily share and access contact lists on your mobile device.
- Create contact groups (Decks)
- Public and private sharing options
- Invite users to private Decks
- Search and add public Decks
- Access shared contacts on mobile
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Call Deck allows you to create groups of contacts and then share with others publicly or privately using the Call Deck Mobile App. Simply create your contact groups and start sharing immediately. Your contact groups which are called “Decks” are first created by naming the Deck and determining if your Deck will be available publicly to the world or kept private to be shared only with those you invite. The steps in this process are simple! 1. Create and name your Deck. 2. Decide if your new Deck is going to be made available privately or to the public. 3. Add records to your Deck. 4. If you’ve created a private Deck invite other to view. The Call Deck App Call Deck Website. To Just View Decks If you have been invited to view a private Deck simply download the App for free and register using the same email where your invitation was sent and your private invite appears instantly within your Call Deck App. To view Public Decks simply download the Call Deck App for free and search Public Decks from within the App and add to your Call Deck App.
Altos
Monitor your indoor air quality to optimize your environment for better focus and well-being. This app connects to a CO2 meter to provide real-time data and alerts, helping you maintain optimal air for productivity and rest.
- Real-time CO2 level updates
- Brain Fuel graph visualization
- Fresh air push notifications
- Real-time home screen widget
- CO2 concentration statistics
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Air composition is crucial for your wellbeing and office productivity – the more CO2 is in the air you breathe, the worse your brain capabilities are. Fortunately, it’s easy to control: just open the window to let some air in, and you’re all set for productivity at work, good sleep, and effective workouts. Connect the app to your Altos CO2 meter so that you’ll always know how much Brain Fuel – useful for your brain performance air – is around you. App features: - Real-time updates of current CO2 level - Easy-to-read Brain Fuel graphs - Push notifications sent every time you might need some fresh air - Real-time widget right on your phone’s screen - CO2 concentration stats over time
Screenshots
Verdict
The clearest difference is rating: Call Deck at 5.0 against Altos's 1.0. Call Deck also leads on iOS requirement (10.0 vs 14.4). Altos's advantage is update cadence (every 3 weeks vs every 3 months). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Call Deck holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Call Deck ships an update every 3 months, Altos every 3 weeks. Both last shipped on November 3, 2026.
| Parameter | Call Deck | Altos |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 1.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 10.0 — better | 14.4 |
| Further details — not scored | ||
| Size | 19 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Flatzap, LLC | Woodenshark LLC |
In-app purchases
Call Deck
No in-app purchases
Altos
No in-app purchases









