Comparison

Contact Separator vs OT Subnet Calculator

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

Head to head
About

Contact Separator

This utility app allows you to separate your contacts into distinct lists, such as business and personal, and protects them from unauthorized third-party access. It also provides caller identification and identifies calls within your call history.

Highlights
  • Separate contacts from standard list
  • Caller Identification
  • Call History Identification
  • vCard Import
  • Privacy protection for contacts
Read full description

Isolate your contacts from the standard contact list and protect them from access by third-party apps. For example, maintain business contacts separately from private contacts and you will still be informed who is currently calling. Calls in the call history are also identified. • Separate contacts from standard contacts • Caller Identification • Call History Identification • vCard Import Privacy Policy: https://it-service-schneider.de/norobots/website-privacy-policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OT Subnet Calculator

This app offers advanced IP subnet calculations and comprehensive IP address management (IPAM) tools. It helps organize networks, devices, and reservations with features like visual address maps, conflict checks, and collaboration options. Learn network concepts through guides and interactive examples.

Highlights
  • IPv4 subnet calculations
  • IP address management (IPAM)
  • Network and device organization
  • Conflict detection
  • Collaboration via iCloud sync
  • CSV and PDF reporting
  • IPv6 exploration
Features
Read full description

IPAM PRO – MORE THAN A SUBNET CALCULATOR Build a central source of truth for sites, customers, and projects. Manage folders, networks, VLANs, devices, reservations, and multiple addresses per device. The visual address map finds free IPs, while conflict checks, smart groups, and audit history keep data reliable. Share folders with roles, collaborate automatically through iCloud, and protect documentation with snapshots, backups, CSV, and PDF reports. IP Subnet Calculator combines fast IPv4 calculations with professional network planning and a compact IPAM. Calculate network addresses, broadcasts, host ranges, subnet masks, and CIDR prefixes—or document complete sites, customers, and devices. FAST AND ACCURATE • Enter an IPv4 address or CIDR directly • Network, broadcast, first and last host • Usable host count and address classification • Quick selection for common prefixes • Copy and export results IPAM FOR YOUR NETWORKS • Folders and subfolders for sites, customers, or projects • Networks with CIDR, VLAN, location, status, and notes • Devices with hostname, IP, and MAC address • Complete CSV export • iCloud sync across your devices • Share your IPAM and collaborate with others PRO TOOLS • Overlap checks for conflicting networks • VLSM and VLAN planning • CIDR aggregation • IPv6 explorer and prefix comparison • Favorites, history, and folders LEARN AND UNDERSTAND Bit visualization, step-by-step guides, practical scenarios, interactive examples, a quiz, and a cheatsheet help both beginners and network professionals. Core calculators are free. IPAM, collaboration, and advanced tools are available permanently with Pro—no subscription.

Screenshots

Contact Separator4 screens
OT Subnet Calculator4 screens

Verdict

The call

The clearest difference is update cadence: Contact Separator at every 9 days against OT Subnet Calculator's every 3 weeks. Contact Separator also leads on iOS requirement (17.0 vs 26.2). On price, review sentiment, 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. Contact Separator sells 2 in-app purchases, starting at $0.99 per month and OT Subnet Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Contact Separator ships an update every 9 days, OT Subnet Calculator every 3 weeks. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

Scorecard2 real differences · 8 level
Contact Separator versus OT Subnet Calculator: the parameters behind the verdict, then further details
ParameterContact SeparatorOT Subnet Calculator
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 9 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhoneiPhone
Requires iOS17.0 — better26.2
Further details — not scored
Size11 MB8 MB
Age rating4+4+
DeveloperLars HerresDominik Gausmann

Customer experience

Contact Separator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

OT Subnet Calculator

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Contact Separator

Subscriptions1
  • Monthly Abo$0.991 Month
One-time1
  • Lifetime$5.99
1 purchases

OT Subnet Calculator

One-time1
  • IP Calc Profi Features$2.99

Questions

Is Contact Separator free?
Contact Separator is free to download, with in-app purchases available.
Is OT Subnet Calculator free?
OT Subnet Calculator is free to download, with in-app purchases available.
Do Contact Separator or OT Subnet Calculator have ads?
Neither Contact Separator nor OT Subnet Calculator shows ads.
Which is updated more often, Contact Separator or OT Subnet Calculator?
Contact Separator ships an update every 9 days, and OT Subnet Calculator every 3 weeks. Most recently, Contact Separator was updated on November 4, 2026 and OT Subnet Calculator on November 5, 2026.

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