Costan vs Perch Door Sim
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Costan
Learn everyday greetings in 14 languages to connect with people worldwide. This app promotes a peaceful, borderless world through simple, friendly communication.
- Learn greetings in 14 languages
- Promotes cross-cultural communication
- Focuses on everyday phrases
- Aims for a peaceful world
- Simple and friendly interface
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In Costan, you also Cosmopolitan from today! From "Time" and "Hello" First. Acquire the voice of the 14 languages of everyday greeting to dodge with a smile. A peaceful world without boundaries in heart!
Perch Door Sim
Transform your apartment's intercom experience with this smart solution. It offers a virtual intercom system, eliminating the need for hardware upgrades. Connect two devices to simulate a modern, functional intercom.
- Virtual intercom system
- No hardware needed
- Connects two devices
- Smart intercom simulation
- Apartment building solution
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Whether you live in an apartment building with an awful intercom or you manage one... we think that you should try our new smart intercom free (no hardware needed). Download Perch on one device and our Whoo Intercom App on a second device and see what your intercom ought to be.
Screenshots
Verdict
The clearest difference is update cadence: Costan at every 6 weeks against Perch Door Sim's every 4 months. Perch Door Sim's advantage is iOS requirement (12.1 vs 15.6). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Costan ships an update every 6 weeks, Perch Door Sim every 4 months. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.
| Parameter | Costan | Perch Door Sim |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 6 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.1 — better |
| Further details — not scored | ||
| Size | 7 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Shinichi Aokawa | Mnemo Corp |
Customer experience
Costan
Perch Door Sim
In-app purchases
Costan
No in-app purchases
Perch Door Sim
No in-app purchases
