Hamsoo (هم‌سو) by NaxonM

AI assistants write Persian well. They display it badly.

Chat interfaces are built for left-to-right text. When the answer comes back in Persian, the page keeps its Latin assumptions: paragraphs stay left-aligned, lines are cramped together, list bullets end up on the wrong margin, and the period at the end of a sentence jumps to the wrong side. The words are right. Everything around them is wrong.

Hamsoo fixes the typography in place, in your browser. It never edits, rewrites, or sends your text anywhere.

WHAT IT FIXES

• Direction — Persian and Arabic paragraphs get the right base direction, decided by the first strong character, the same way the web standard's own automatic mode works.
• Punctuation — sentence-ending periods and colons stay where they belong instead of jumping to the wrong end of the line.
• Lists and tables — mirror as a whole, so bullets share one margin instead of splitting between both.
• Mixed content — English terms inside a Persian sentence keep their own direction, and Persian words inside an English sentence do not flip the paragraph.
• Code stays code — code blocks, inline code, and links are never flipped.
• The typing box — your composer gets the right direction from the very first character you type, even while empty.

TYPOGRAPHY

• Six bundled Persian fonts: Vazirmatn, Estedad, Sahel, Shabnam, Samim, Gandom.
• Or load your own — up to 12 custom font files (.woff2, .ttf, .otf).
• Independent control of size, line height, weight, letter spacing, alignment, and reading column width.
• Localized digits: Persian ۱۲۳ or Arabic-Indic ١٢٣, reversible instantly.
• Per-site settings — different typography for each site, saved separately.

CONTROL

• Instant on/off. Switching Hamsoo off completely undoes everything it added — no page reload needed.
• Keyboard shortcut (Alt+Shift+R), remappable.
• Works on any website, not just the built-in list — add the site you are on straight from the popup.
• Element picker — right-click any element to fix it permanently on that site.
• Full options page, settings backup export/import, and sync across your devices.
• Interface in Persian, English, and Arabic.

WORKS OUT OF THE BOX ON

ChatGPT, Claude, Gemini, DeepSeek, Grok, Perplexity, Microsoft Copilot, Google AI Studio, Qwen, Kimi, Poe, and NotebookLM — plus any other site you add yourself.

PRIVACY

Everything runs locally in your browser. No analytics, no telemetry, no remote servers, no network requests of any kind. Your settings and fonts stay in your own browser profile. Hamsoo never reads, stores, or transmits the content of your conversations.

Broad site access is NOT granted at install time. Permission is requested only for the specific site you choose to add, at the moment you add it.

Free and open source, licensed under AGPLv3.
Source code: https://github.com/NaxonM/hamsoo