Cellbrook

No. 01 Add-ons for Google Sheets™

Quiet, exact tools for the sheets you run your work on.

Cellbrook makes three small add-ons, each with one job: put addresses on a map, turn rows into calendar events, and print labels. They show their limits, ask for as little access as possible, and never keep a copy of your sheet.

All three are live on the Google Workspace Marketplace: MapRows, CalendarRows and LabelRows.

Your columns stay as they are. MapRows writes only into new ones.Illustrative data

MapRows

350 5th Ave, New York, NY 1011840.74844, -73.98566

CalendarRows

Site visit · 2026-11-10 · 10:00 AMSite visitTue, Nov 10, 10:00–11:30

LabelRows

Space Needle · 400 Broad St · SeattleSpace Needle400 Broad St
Seattle, WA 98109

Contents

Three add-ons. One set of rules.

MapRows Geocoding & maps

Turn a column of addresses into latitude and longitude, reverse-geocode coordinates, get straight-line distances and, with Pro, driving, walking and cycling times. Drop a map of your rows onto its own tab.

Free
100 lookups a day, no card
Pro
$9/month or $59/year, tax included
Can see
Only the spreadsheet you have open
Add to Google Sheets, free
About MapRows

CalendarRows Rows to events

Create, update and delete Google Calendar™ events from the rows of your sheet, or import a calendar into a new tab. Running it again updates the same events, so there are no duplicates and no invitation emails.

Free
50 calendar changes a day
Pro
$9/month or $59/year, tax included
Preview
See every change before it happens
Add to Google Sheets, free
About CalendarRows

LabelRows Labels & badges

Mailing labels and name badges from your list. LabelRows lays your rows out in a new Google Doc sized for your label sheet, including Avery®-compatible sizes such as 5160. Print at 100% and you're done.

Free
5 popular sizes, 60 labels per Doc
Pro
Coming soon. Price posted before sale
Can see
Only the Docs it creates
Add to Google Sheets, free
About LabelRows

Permissions, line by line

Know exactly what each add-on can touch.

Most add-ons leave this to Google's consent screen. Here it is up front. Each add-on asks for the narrowest access that does the job.

AccessMapRowsCalendarRowsLabelRows
The spreadsheet you have openYesMapRowsYesCalendarRowsYesLabelRows
Your other Drive filesNoMapRowsNoCalendarRowsOnly the label Docs it createsLabelRows
Google CalendarNoMapRowsYour events, to send and importCalendarRowsNoLabelRows
Gmail, contacts, email addressNoMapRowsNoCalendarRowsNoLabelRows
Sheet contents stored by CellbrookNeverMapRowsNeverCalendarRowsNeverLabelRows
Sent outside GoogleSelected columns to Geoapify, for lookupsMapRowsNothing from your sheetCalendarRowsNothing from your sheetLabelRows

A summary. A Pro license key, if you have one, is checked with our license server. The full list of permissions and services is in the privacy policy.

How we work

The fine print, printed large.

Most add-ons hide their limits and make leaving hard. We'd rather you knew exactly what you're getting before you install anything.

  1. Your data stays in your sheet

    We run no database of your spreadsheet content. Cells you choose go only to the service that does the job, and every service is named in the privacy policy.

  2. The fewest permissions we can ask for

    Each add-on sees only the spreadsheet you have open. LabelRows uses Google's drive.file permission, so it can open only the Docs it makes.

  3. Limits you can see

    Allowances show in the sidebar as you work. Hit one and the job pauses safely, then resumes from the next unfinished row. No half-written sheet, no surprise bill.

  4. Easy to leave

    Prices include tax. Cancel in one click or with one email. Your first payment comes with a 14-day, no-questions refund.

  5. A real inbox, and no trackers

    Questions go to support@cellbrook.com and get a written answer, usually within two business days. This website sets no cookies and runs no analytics.

Pricing

One price: the total you pay.

MapRows Free

$0

No card. No time limit.

  • 100 lookups per day
  • Geocode & reverse geocode
  • Straight-line distance
  • Maps with up to 25 points

MapRows Pro

$9/month

or $59 a year. Tax included.

  • 2,500 lookups per day (fair use)
  • Driving, walking & cycling times
  • Maps with up to 200 points
  • Use your own Geoapify key
Full pricing & terms

CalendarRows Pro

$9/month

or $59 a year. Tax included. Free plan: 50 changes a day.

  • 2,000 calendar changes per day (fair use)
  • Repeating events
  • Imports of up to 5,000 events
  • LabelRows: free now, Pro coming soon
CalendarRows pricing

Checkout is handled securely by Stripe. We never see your full card number.

Colophon

Who's behind Cellbrook.

Cellbrook is the product brand of MRSLM Group LLC, a Florida limited liability company that builds focused add-ons for Google Sheets. Read more about us.

Company
MRSLM Group LLC
Address
7095 Hollywood Blvd Ste 484
Los Angeles, CA 90028
Support
support@cellbrook.com
Payments
Stripe
Listing
Google Workspace Marketplace: MapRows, CalendarRows and LabelRows

All three are live.

MapRows, CalendarRows and LabelRows are on the Google Workspace Marketplace now, and each one starts free. Install the one you need and it opens right inside Google Sheets.

Add MapRows to Google Sheets