Practical software, built and run by its makers.

AATBIT Labs is a two-person software team in Kolkata, India. We build and run BetterMerge and Tenwrite, and have been shipping since 2021.

See what we make Our story

Rupam Poddar and Aakash HowladerFounders

BetterMergeMail merge for Gmail and Google Sheets.

Send one email as hundreds of personal ones.

BetterMerge fills in names, links and attachments from a Google Sheet, sends from your own Gmail on your schedule, and writes opens and clicks back to the sheet.

The app asks Gmail for permission to send only, so it cannot read your mailbox. Optional reply and bounce tracking runs as a separate script that you authorize yourself.

How reply and bounce tracking works

19,000+installs

4.9 / 5140+ ratings

Google Workspace Marketplace, October 2026

Visit bettermerge.com Read the docs

Q4 outreachGoogle Sheets

First name	Company	Status
Priya	Northwind	Clicked
Marcus	Brightline	Clicked
Elena	Fieldstone	Clicked
Tom	Harbor & Co	Sent
Aisha	Lumen Labs	Opened

To priya@northwind.example, sent from your Gmail

Quick idea for Northwind

Hi Priya, I put together a short proposal for your team. It's attached as Northwind-proposal.pdf

Illustration with example data

TenwritePublish Google Docs to WordPress and Blogger.

Write in Google Docs. Publish to WordPress without copy and paste.

Tenwrite keeps formatting, images and SEO metadata intact when it publishes. Manage posts across client sites in one place, automate publishing from Drive or Sheets, and track how articles perform in search.

Tenwrite publishes a data processing agreement and the list of sub-processors it uses.

Data processing agreement Sub-processors

1,000+installs

4.9 / 58 ratings

Google Workspace Marketplace, October 2026

4.2 / 510 reviews

Trustpilot, October 2026

Visit tenwrite.com Read the docs

Content calendarGoogle Docs

How to plan a quarterly content calendar

Site: Client blog
Category: Guides
Status: Publish

Export to WordPressExporting…Exported

clientblog.exampleWordPress

Waiting for an export

How to plan a quarterly content calendar

Guides

Published

Illustration with example data

Shipped recently

The latest entries from our product changelogs. Two people, both still writing the code.

BetterMerge changelog Tenwrite changelog

Two engineers, no investors

We are old college friends. Today Rupam leads BetterMerge and Aakash leads Tenwrite, and the only people we answer to are the ones using them.

We do not sell user data, and we ask for as little access to your Google account as each product needs. How our products handle your data

Rupam PoddarFounder, builds BetterMerge
Aakash HowladerCo-founder, leads Tenwrite

More about us

Late 2021
Rupam ships the first version of the mail merge add-on for Google Sheets.
2021 to 2025
He builds and runs BetterMerge and Tenwrite on his own.
Early 2026
Aakash joins as co-founder and takes over Tenwrite.
Mid 2026
Both products come together under one name: AATBIT Labs.

Open source

Trimwise is an open-source Python library and free API that uses query-aware extractive compression to trim long documents to fit an LLM prompt budget. We wrote and use it internally; anyone can use it for free.

Try the demo Source on GitHub