New Jobs that fill in thousands of rows while you work

Ask what’s going on.Or say what to fix.

Spreadsheets, exports and logs. Now also Postgres, MySQL, MariaDB, SQLite and Google Cloud logs. Ask in plain English. Your file never leaves your machine.

Download for Mac — Free Watch a 25-second run
  • No card
  • 30 requests a month, free
  • Nothing is uploaded
  • Mac and Windows
  • Excel
  • CSV
  • JSON
  • Parquet
  • Postgres
  • MySQL
  • SQLite
  • Web APIs
  • Google Cloud logs
Weaver's answer in Dataweaver: 9 unpaid invoices totalling ₹129,000, listed in a table
Recorded in Dataweaver with sample data. Every company, name and amount is invented.

Ask once. Weaver works until it’s done.

There is no plan to approve and no wizard. Weaver looks, works something out, looks at what came back, and goes again until it has your answer.

  1. 1

    Open it

    A spreadsheet, an export, a log, or a database you connect to.

  2. 2

    Say what you want

    In your own words. No formulas, no code, no menus to learn.

  3. 3

    Weaver works

    Every pass has the same shape. Weaver says what it will try, runs one thing on your machine, reads what came back, and decides the next pass. It can draw a chart, query your database, call a web API, or stop and ask you. This is the run at the top of this page, pass by pass.

    1. 1Looked at the paid column.9 of 25 are empty. The rest are dates in three formats.
    2. 2Wrote Python and ran it on the file.9 unpaid rows. The total came back as text, because one amount was typed as ₹23,900.
    3. 3Read that. Stripped the ₹ and the commas, ran it again.₹129,000.
    4. 4Wrote the answer.Nine invoices in a table. 36 seconds from send to answer.
  4. 4

    Take the result

    A written answer, plus any chart or file it made, on the shelf above your chat.

  • Quick, Standard or Expert. Three different models, from the fast one to the strongest. The stronger the model, the better it plans, uses its tools and writes the answer.
  • Ask again while it runs. Requests queue, and you can edit one before it starts.

Opens spreadsheets, databases, logs and APIs.

Spreadsheets and files

  • Excel
  • CSV
  • JSON
  • Parquet
  • TSV
  • JSON Lines
  • Arrow
  • XML
  • Text
  • Logs
  • Markdown
  • SQLite files

Databases

  • Postgres
  • MySQL
  • SQLite
  • MariaDB

Web APIs and logs

  • Web APIs
  • Google Cloud logs

What people ask it, and what comes back.

  • Find every customer that appears twicean answer
  • Which month did returns spike?a chart
  • Standardise every date to DD-MM-YYYYa clean file
  • Fill in the missing pincodes, row by rowfilled-in rows
  • What's in this 900 MB export?an answer

Your file stays here. Only a description leaves.

Every parse, edit, chart and export happens on your own machine. Personal details are replaced here, before anything is sent.

Stays on your machine

invoices-march.csv

  • The file itself, always
  • Every parse, edit, chart and export
  • Code that runs here, with no internet
  • Your database passwords
  • Your messages and every result

Can leave

  • What you type
  • Column names and types
  • Counts, ranges and how many are blank
  • Up to fifty values from ordinary columns
  • Counts only from personal columns, nothing from the most sensitive
  • What the code prints back
  • File and folder names inside your workspace
  • The title and a short summary of each chat

replaced before it leavesarjun@meridian.in[REDACTED:email]

Exactly what goes out, and to whom

Emails, phone numbers, card numbers, ID numbers, IP addresses and access keys are found and replaced on your machine first. That matching works on patterns. It is thorough, not a guarantee.

What leaves goes to us, then to one of several AI providers that work out the steps. Which one depends on the mode you pick and on what is up at the time. The names, as of today, are in the privacy policy. All of them are commercial providers. A model on a server you control, or one that never leaves your country, is planned and not shipped.

Databases you connect are read-only, and there is no setting that changes that.

Read the privacy policy

Why not just use ChatGPT or Claude?

Both open files, run code and hand back a spreadsheet. Both do more than Dataweaver does. What differs is where the work happens, and what leaves your machine.

Dataweaver
ChatGPT or Claude
Your file is parsed here. It is never uploaded.
Your file is uploaded, or read off your disk into a session on their servers.
The code runs here, on your machine, with no internet.
The code runs on their servers, on their copy of your file.
Emails, phone numbers, card and ID numbers are replaced before anything leaves, and put back when the answer comes home.
Sent as typed. On personal plans, kept and used to train their models unless you turn that off.
Databases are read-only, and the query runs here. There is no setting that changes that.
A connector, and the rows it returns go to their servers.
A job that calls a web API once per row, for a hundred thousand rows, runs here in the background. Quit, and it pauses. Open the app, and it carries on.
Their code sandbox blocks the calls, or an admin has to allow them first.

They also browse, write, draw, remember you across chats and plug into hundreds of apps. Dataweaver does none of that. It does data files and databases, on your machine.

Questions people ask first.

What is Dataweaver?

A privacy-first desktop app for data work. Open a spreadsheet, an export or a database, say what you want in plain English, and Dataweaver works out the steps and runs them on your own machine. The file is never uploaded. What the AI gets is a description of it, and your words with personal details replaced.

What does Dataweaver actually send?

Not your file. The file is never uploaded, and every parse, edit and export runs on your machine. What goes up is a summary: what you typed, your column names and types, statistics like null counts and ranges, and a small sample of values. Emails, card numbers, phone numbers, account IDs and API keys are found and replaced on your machine before anything is sent. Nothing you type and nothing Dataweaver writes is stored on our servers.

Can it answer questions and make charts, or only clean things up?

Both. Ask what is going on and Dataweaver profiles the file and reports what it finds: where the missing data clusters, which columns barely vary, which are skewed, and which two files will join and on what column. Ask for a chart and you get one of fifteen kinds built from real columns in your file, which you can keep on a dashboard that re-reads your data rather than freezing a picture of it.

What if it gets something wrong?

Your original file is never edited in place, so the worst case is a new file you delete. Every save also reports what it could not carry across. Excel formulas, for example, are saved as their last computed value, and Dataweaver tells you that rather than letting you discover it later.

Can it write to my database?

No, and that is enforced rather than promised. Every statement is parsed and checked against a list of read-only shapes, the database session itself is set read-only, and SQLite additionally runs under query_only. Connect Postgres, MySQL, MariaDB or SQLite to browse the schema, search for the tables you need, run SELECT queries and export the results.

How big a file can it open?

There is no row limit and no size tier. Spreadsheets in the millions of rows open, and how far you can go depends on your own machine's memory. Raw text, log and XML files are capped at 50 MB for whole-file operations such as the PII scan.

Do I need to know formulas or code?

No. If you can describe what you want in a sentence, such as remove the duplicates, put the dates in one format, or flag rows where the total is blank, that is enough. Dataweaver writes the code and runs it for you.

Does it work offline?

No. Dataweaver needs you to sign in, and each request needs a connection so it can work out the steps. Your files still stay on your machine, but this is not an offline tool.

What can it open?

Spreadsheets (.xlsx, .xls, .xlsm, .xlsb, .csv, .tsv), data files (.json, .jsonl, .parquet, .arrow, .xml), text and logs (.txt, .log, .md), and SQLite database files. It also connects to Postgres, MySQL and MariaDB, to any REST API with an OpenAPI description, and to Google Cloud Logging. Saving back out gives you Excel, CSV, TSV, JSON, JSONL, Parquet, Arrow or XML.

Is it free?

Thirty requests a month, free, with no card. One request is one thing you ask for, however many steps it takes to finish. Browsing your data, previews and edits you make yourself do not count. Paid plans raise the monthly allowance and, once it is used up, keep working on the faster model rather than stopping you.

Which platforms?

macOS on Apple Silicon, and Windows 10 or later on 64-bit. There is no Intel Mac build and no Linux build yet.

Point it at the file you keep putting off.

Thirty requests a month, free. No card.

Download for Mac

Mac on Apple SiliconWindows 10 or later, 64-bit