twilight ventures

tools for data files, where you already work

At twilight ventures we make tools for data files. Each one opens a file in the IDE, the editor, a Confluence page or a Jira issue, and reads the part on screen first, so the first page of a 10 GB Parquet dataset, a multi-gigabyte log or a 500,000-row sheet is up while the rest is still being read. From there the file can be searched, sorted and filtered, profiled, exported, converted and compared, as far as each product goes. Viewing is free on the ten products in the stores; the two Atlassian apps are in review on the Atlassian Marketplace. None of the products sends a file's contents anywhere. The plugins and extensions read the file on your machine, and the two Atlassian apps read an attachment inside your own Atlassian site, as the person viewing it, with nothing leaving that site; the security policy has the detail.

what we make

jetbrains ides

• JSONL Lens

  JSON Lines and NDJSON files of any size, gzipped included

  filter, export, stats in Pro

• Log Lens

  multi-gigabyte plain, JSON lines, logfmt and ANSI logs, followed as they grow

  filter, statistics, export in Pro

• Parquet Lens

  Parquet, Avro, TFRecord, Arrow and Feather datasets, straight off disk

  filter, sort, export, profile in Pro

• SQLite Lens

  read-only browser for SQLite database files, no lock taken

  SQL console, export, diff, profile in Pro

• XLSX Lens

  Excel workbooks streamed read-only, sheets of any size

  export, sort, filter, diff, profile in Pro

• Notebook Lens

  Jupyter notebooks rendered as documents, outputs included, no kernel

  diff, search, export in Pro

• DuckDB Lens

  read-only browser for DuckDB database files, every schema in a tree

  SQL console, export, diff, sort in Pro

• Heap Dump Lens

  JVM heap dumps, thread dumps and GC logs, parsed in the editor

  retained sizes in Pro

vs code

• JSONL Lens for VS Code

  JSON Lines and NDJSON files of any size as a grid

  Open VSX and the Visual Studio Marketplace

• Parquet Lens for VS Code

  Parquet, Avro, TFRecord, Arrow IPC and Feather v2 files as a table

  Open VSX and the Visual Studio Marketplace

confluence and jira

• Lens File Viewer for Confluence

  CSV, JSONL, Parquet, Excel and, from the 2.4.0 build under review, log attachments as paged tables on the page

  Atlassian Marketplace, in review

• Lens File Viewer for Jira

  logs, CSV, JSONL, Parquet and Excel attachments as paged tables on the issue

  Atlassian Marketplace, in review

what opens where

Twenty-one file formats across twelve products, the two Atlassian apps in review among them, in one table. Pick a format to land on its row.

• JSONL
• NDJSON
• gzipped JSONL
• plain logs
• logfmt
• ANSI logs
• CSV
• TSV
• Parquet
• Avro
• TFRecord
• Arrow IPC
• Feather
• SQLite
• DuckDB
• XLSX
• XLSM
• Jupyter notebooks
• HPROF heap dumps
• thread dumps
• GC logs

what's new

• 

  Parquet Lens 1.8.0published 2026-09-11

  The profile report, a Pro export. full note

• 

  SQLite Lens 1.4.0published 2026-09-11

  A column profile report, the second Pro export. full note

• 

  XLSX Lens 1.4.0published 2026-09-11

  The column profile report, a second Pro export for the open sheet. full note

The newest note of every product, newest first.

free and pro

On the ten products in the stores viewing is free, and the free tier is the complete viewer rather than a demo. Pro is the paid tier of each of those ten and holds the heavier work: a filter or a sort over every record, the exports, the profile report on the products that have one, the SQL consoles. On the JetBrains Marketplace Pro is a subscription per plugin, and every plugin starts its own 30-day trial of it. For VS Code, Pro is one key from Polar, bought once, that serves both extensions, and each machine gets a 14-day trial with no key to enter. The two Atlassian apps have no Pro tier; they are in review on the Atlassian Marketplace and their listings are not public yet.

support and security

• support
• security policy
• privacy
• guides

Write to [email protected] about a product or a purchase, to [email protected] about pricing, invoices and licensing, and to [email protected] about a security problem only.