HAYAH

Independent studio · Windows apps

Small, sharp Windows apps that just work.

HAYAH makes focused Windows apps for the Microsoft Store: convert photos and audio, edit spreadsheets, read books and chat with AI. Each one is free to download, with optional upgrades.

Get an app straight from the Microsoft Store

What we do

One job, done well

Each app is built around one job, not a do-everything suite.

Made for Windows

File Explorer integration: right-click conversion for photos and audio, and Open with for books and spreadsheets.

Delivered by the Store

Install and update through the Microsoft Store. No separate installer, and no account with us.

Our apps

Five apps, all free to download. Upgrade only if you need more.

HEIC Converter app icon

HEIC Converter - HEIC to JPG, Viewer & Batch

Open and convert HEIC photos on Windows, from a single photo to whole folders. Photos are processed on your PC and never uploaded.

  • View .heic, .heif and .hif files with a double-click
  • Convert to JPG or PNG, keeping date, camera and location data
  • Right-click convert in File Explorer; originals are never touched

Free: unlimited viewing and up to 5 files per conversion batch. Pro: unlimited batch size, subfolders, WebP, TIFF and BMP output, resize and rename.

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XLSX Editor app icon

XLSX Editor - Spreadsheet, CSV Editor & XLSX to PDF

Open, edit and print everyday spreadsheets without an Office subscription or an account.

  • Opens .xlsx, .xls and .csv; saves .xlsx, .xls and .csv
  • Live print preview; XLSX to PDF export with Pro
  • Automatic recovery copy after a crash or power cut

Free: open, edit and print, unlimited CSV saves, and 3 workbooks a day saved as .xlsx or .xls. Pro: no daily limit, PDF export, full page setup, dark theme.

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Audio Converter app icon

Audio Converter - MP3, M4A, WAV, FLAC & CD Ripper

Convert audio, pull soundtracks out of videos and rip CDs. Files are converted on your PC and never uploaded.

  • MP3, M4A, WAV, FLAC and OGG output, with batch conversion
  • Take audio from MP4, MOV, MKV, WebM and more
  • Rip audio CDs, with track names looked up on MusicBrainz

Free: 5 files at a time to the five main formats. Pro: no limit, Opus, ALAC, AIFF and WMA output, trim, normalize, tag editor.

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EPUB Reader app icon

EPUB Reader - eBook, MOBI, AZW3, Comic & EPUB to PDF

Read eBooks and comics in one library, with highlights, search and EPUB to PDF. Books are read on your PC and never uploaded.

  • EPUB, MOBI, AZW3, FB2, PDF and CBZ in one library (DRM-free books only)
  • White and dark pages, your font, size and margins
  • Bookmarks, four highlight colors and full-book search

Free to read, with 3 EPUB to PDF exports. Pro: unlimited EPUB to PDF, read aloud, highlight export, sepia, own fonts, CBR.

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AI Chat app icon

AI Chat – AI Assistant & Chatbot

An AI assistant for Windows that keeps your chat history on your PC. It needs an internet connection and uses Anthropic's Claude models.

  • Quick, Balanced and Deep answer modes, switched from a menu
  • Search all your chats, group them in projects, attach images, or chat incognito
  • No sign-up or password; light and dark themes

Free: a limited allowance of Quick answers. Pro (subscription for 1, 3, 6 or 12 months): Balanced and Deep modes and more messages. Fair-use limits apply.

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Why HAYAH

Your files stay on your PC

HEIC Converter, XLSX Editor, Audio Converter and EPUB Reader never upload your files; each app's privacy page says so. AI Chat stores your chats on your PC and sends the relevant part of a conversation to its AI service to get an answer.

Free first, upgrade later

Every app is free to download. The four file apps have one-time upgrades (HEIC Converter and Audio Converter also sell a 7-day pass); none of them renews. AI Chat is the only subscription, because every answer has a running cost.

No ads, no accounts

None of the five apps shows ads or asks you to create an account.

Honest about data

The apps send anonymous usage events (which features were used, never your files) to help us fix and improve them. You can turn them off in Settings. Each app's privacy page lists what is sent.

Say hello

Questions, bug reports or ideas? Write to support@hayah.dev. We reply as soon as we can.