Open Markdown, JSON, CSV, YAML, Mermaid and Graphviz diagrams, Jupyter notebooks and PDFs as clean, readable documents on iPhone, iPad, Mac, Vision Pro and Android. Sign any PDF, and redact PDFs on iPhone, iPad, Mac and Android, into a new file.
This page is designed to help you find out whether hYYa ink is good and if it is the right choice for you.
A .md file. A JSON export. A notebook, a diagram, a contract to sign. hYYa ink opens them as clean, readable documents instead of walls of raw text, on your Mac, iPhone, iPad and Apple Vision Pro.
READ WHAT YOU'RE SENT
• Markdown — clean headings, lists, tables and links • JSON, YAML and TOML — tidy trees you can fold and explore • CSV and TSV — a real table, not a wall of commas • Mermaid and Graphviz — diagrams drawn instantly, offline • LaTeX — math that looks right • Jupyter notebooks — cells, code and text outputs, easy to read • AsciiDoc, Org-mode, XML, diffs and logs — readable at last
FIX IT WHERE YOU SEE IT
Change a JSON value or a table cell right on the page, and only that changes. Sort, filter and find & replace in any table. Write Markdown with a simple toolbar. Edit any text file and see it as a clean document.
SIGN, MARK UP AND REDACT PDFS
Tap the spot and type. Draw your signature, then place, resize and rotate it. It's a visual signature, not a certified one. Add stamps such as Approved or today's date. Highlight, underline or mark up by hand.
Find any word in a PDF, browse by page or contents, and open password-protected files. Make a scan searchable, right on your device. Reorganize, split, compress, protect or watermark, and each one saves a new file. Compare two PDFs to see which pages differ.
TURN ONE FORMAT INTO ANOTHER
Save JSON, YAML, TOML and XML as one another, tables as CSV or TSV, notebooks and Org files as Markdown, Markdown and AsciiDoc as web pages, and diagrams as SVG or PNG. If something can't carry over exactly, hYYa ink tells you first.
ASK AI, WITH YOUR OWN KEY
Explain, summarize or translate a document, PDFs included. Fix errors, reformat, or turn an idea into a diagram. Connect OpenRouter, Groq, Together AI or a compatible service. Your key stays on your device. Only the open document's text is sent, and only when you run an AI action. Every AI result says it was written by AI.
Listed in
16 formats
Markdown, JSON, YAML, CSV, Mermaid, LaTeX, Jupyter, PDF and more, rendered as documents
PDF tools
Fill in, sign and mark up PDFs, always saving a new file
Works offline
Every format renders on the device, with no plugins and no account
hYYa ink opens the files developers and writers deal with every day, such as Markdown, JSON, YAML, CSV, Mermaid, LaTeX, Jupyter and PDF among 16 formats. It shows them the way they're meant to look instead of as walls of raw text. It is a viewer and editor in one native app, on Mac, iPhone, iPad, Apple Vision Pro and Android.
The idea behind hYYa ink is simple: the files people work with every day should read like documents, not raw syntax. It comes from hYYa, one studio behind a family of private-by-default apps. Like each of them, it does one job well and keeps your information yours.
You don't need an IDE, a cloud or an account: you open a file and read it. Everything renders on the device and works offline, and your documents never leave it unless you run the optional AI assistant with your own key. Reading every format, Preview, saving as PDF and printing are free forever. Editing and the PDF tools come with a 7-day free trial, then a one-time Pro unlock instead of a subscription.
Developers, writers and anyone who opens Markdown, data files, diagrams, notebooks or PDFs. They want to read them as documents, fill and sign a form, or mark up a PDF without opening a heavyweight tool.
A native app on each platform. Every format renders locally with no plugins: Mermaid and Graphviz diagrams are drawn offline and LaTeX maths is typeset with KaTeX. On the Mac there is a Quick Look extension. The optional AI uses a provider the user connects with their own key, or on the Mac a local model through Ollama or LM Studio.
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Is hYYa ink good? This is an informative page that will help you find out. Moreover, you can review and discuss hYYa ink here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
