Web app
Data Extractor
from $9.99Finds the tables inside your Word, Excel, PDF, CSV and HTML files and hands them back as a tidy spreadsheet. The files stay on your computer.
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Software for work and study
Kobaltstack
We make easy-to-use software that takes care of everyday tasks, from paperwork and email to writing and homework.
About us
Useful tools, no learning curve
Kobaltstack builds and supports software that runs in the browser. Every product is made to be useful on the first try, with clear pricing and help from the people who build it.
- Each product focuses on one job and gets it done without setup.
- Works on any computer: open it in the browser and start, nothing heavy to install.
- Monthly or yearly plans and a 14-day money-back guarantee.
Our products
Pick a product, start in a minute
Tools for work and study. Open any of them to see how it works.
Web app
WriteHero
from $29Drafts LinkedIn posts in your own voice. It studies what you have already published, so new posts read like you and not like a template.
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Chrome extension
AI Photo Editor for Nano Banana
from $7.99Creates and edits pictures from a short prompt: replace a background, change the light or keep one character the same across a series.
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Chrome extension
Photo Math Solver
$6.99 / monthSelect an equation, graph or word problem anywhere on your screen and get the answer, with every step explained.
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Web app
Chemistry AI
from $5.50Explains chemistry problems step by step. Type the question or upload a picture of it, with subscripts, arrows and Greek letters at hand.
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Web app
Human Type Simulator
$5.99 / monthMakes a video of your text being typed by a person, with an uneven rhythm, pauses and fixed typos, in a document, code editor or chat.
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Chrome extension
Focus Website Blocker
$3.37 / monthBlocks the sites that pull you away from work, by address, category or keyword, on a schedule or during focus sessions with a built-in timer.
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Chrome extension
Gmail App
from $4.99Opens your inbox as a separate desktop window on Windows and Mac, with new-mail alerts, dark mode, AI summaries and replies, and emails saved as PDF.
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Contact us