Comparison

Call Deck vs Altos

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Create contact groups (Decks)
  • Public and private sharing options
  • Invite users to private Decks
  • Search and add public Decks
  • Access shared contacts on mobile
Features
Read full description

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.

About

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.

Highlights
  • Real-time CO2 level updates
  • Brain Fuel graph visualization
  • Fresh air push notifications
  • Real-time home screen widget
  • CO2 concentration statistics
Features
Read full description

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

Call Deck4 screens
Altos4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Call Deck ships an update every 3 months, Altos every 3 weeks. Both last shipped on November 3, 2026.

Scorecard3 real differences · 6 level
Call Deck versus Altos: the parameters behind the verdict, then further details
ParameterCall DeckAltos
PriceFreeFree
Rating5.0 (1 ratings) — better1.0 (1 ratings)
Number of ratings11
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS10.0 — better14.4
Further details — not scored
Size19 MB43 MB
Age rating4+4+
DeveloperFlatzap, LLCWoodenshark LLC

In-app purchases

None

Call Deck

No in-app purchases

None

Altos

No in-app purchases

Questions

Is Call Deck free?
Call Deck is free to download, with no in-app purchases.
Is Altos free?
Altos is free to download, with no in-app purchases.
Which has better reviews, Call Deck or Altos?
Call Deck is rated higher. Call Deck averages 5.0 out of 5 from 1 ratings, while Altos averages 1.0 from 1 ratings.
Do Call Deck or Altos have ads?
Neither Call Deck nor Altos shows ads.
Which is updated more often, Call Deck or Altos?
Call Deck ships an update every 3 months, and Altos every 3 weeks. Most recently, Call Deck was updated on November 3, 2026 and Altos on November 3, 2026.

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