Kastemer icon

Kastemer

by Labs Dev Crew · Communication
Manifest V3 in_app
View in Chrome Web Store Data as of 15 Oct 2026

Contact management and Broadcasting message tool

Users
2
−1 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#362K
#274K among extensions
Version
1.0.0
updated 26 Nov 2024

Users

monthly, 2 years
023Nov 2024Nov 2025Oct 2026
Latest, 15 Oct 2026: 2 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years
001Nov 2024Nov 2025Oct 2026
Latest, 15 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Kastemer

Browser extension to manage contact and send messages in bulk

Growth

WindowUsersChangeRatingsRating
7 days−1−33.3%00.00
30 days−1−33.3%00.00
6 months+2–00.00
1 year+2–00.00

Version history

1 versions recorded
1.0.026 Nov 2024

Details

Category
Communication
First seen
26 Nov 2024
Size
225 KB
Languages
en-US
Pricing
in_app
Privacy policy
kastemer.com
Extension ID
ecimbckphddmmgndcogbedhflgefdkfl

Permissions and risk

Low riskimpact 1, likelihood 2
Permissions
storageunlimitedStorage
Site access
*://*.kastemer.com/*

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