K for Contact vs EspBlufi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K for Contact
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With K for Contact you share your information safely and securely. In return you will also have access to the latest information about your contacts. You will have full control over your information and which piece of information you decide to share with whom. You can at any time change, update or remove the information. K for Contact is an address book like no other. You can only change your own information. All the other contacts in the address book is handled by each owner itself. K for Contact will NOT upload any of your existing contacts to our servers. Only the profile data you submit yourself will be uploaded. With K for Contact each person only updates their own information - just as it should be! The information is then shared between contacts.
EspBlufi
This utility app facilitates communication with IoT devices using BLE data. It enables device distribution and custom data transmission, requiring the external device to be powered on for connection.
- BLE communication with IoT devices
- Device distribution
- Custom data transmission
- Custom data reception
- Search and connect functionality
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EspBlufi is based on the Blufi protocol and communicates with IOT devices via BLE data to implement device distribution and custom data transmission and reception. The system can search successfully and connect only after the external device is started.
Screenshots
Verdict
The clearest difference is iOS requirement: EspBlufi at 10.0 against K for Contact's 15.1. On price, update cadence, 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.
K for Contact ships an update every 5 months, EspBlufi every 2 months. The most recent releases landed on October 26, 2026 and October 21, 2026 respectively.
| Parameter | K for Contact | EspBlufi |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.3 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.1 | 10.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | New Seed IT Solutions AB | ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD. |
In-app purchases
K for Contact
No in-app purchases
EspBlufi
No in-app purchases
Questions
Is K for Contact free?
Is EspBlufi free?
Do K for Contact or EspBlufi have ads?
Which is updated more often, K for Contact or EspBlufi?
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