Σ Sigma: Private Files & SMS

Your phone should work for you, not watch you. Σ Sigma is a file manager, a keyboard, a messaging app, notes, a to-do list and a clipboard — six apps in one, and it never phones home. No cloud. No account. No tracking. No ads. Nothing you type, send, or save ever reaches us — there is no server for it to reach. One app, everything you actually use: 📁 A REAL FILE MANAGER: Browse every folder on your device and manage any kind of file — documents, archives, code, photos, anything. Move, copy, rename, delete. Open archives without unzipping. Compress what you want to send. Undo from the trash. Search across all of it. Share anything to anyone, straight from the file list — text it, or hand it to any app on your phone. And between two devices both running Σ, files go direct over your own network, with no upload and no middleman. ⌨︎ A KEYBOARD WORTH SWITCHING TO: Glide across the keys to type whole words. Real prediction and autocorrect that learn how you write — and never watch a password field. Type actual math — fractions, roots, exponents, Greek — and chemical formulas too, then drop any of it anywhere as a clean image. Long-press ζ for chemistry. Turn a word into an emoji, do "=2+2" inline, convert units as you type, and more. It runs entirely offline, right on your phone. 💬 YOUR REAL MESSAGING APP: Set Σ as your SMS app and text like normal — individual and group threads, pictures you can open full-screen and save, delivery states, the works. Bring your existing conversations with you. Everything Σ holds is encrypted on your device. Σ to Σ, messages are encrypted end to end — nobody in between can read them, not even us. To anyone else you're sending ordinary SMS, which your carrier carries as it always has. 📝 NOTES & ✅ TO-DO, TOGETHER: Write, format, and organize into folders and subfolders. Turn any list into a checklist with due dates. Moving from another notes app? Just share your notes to Σ and they land ready to sort — titles, folders, and checklists intact. 📋 A CLIPBOARD THAT REMEMBERS: Your keyboard keeps a clipboard history you can see — and long-press to hide anything sensitive. 📱 HOME-SCREEN WIDGETS: Pin a note, a to-do checklist you can tick off in place, an unread-message count, or a whole conversation you can reply to — all without opening the app. Every widget sizes however you like. WHY PEOPLE MAKE THE SWITCH: - One app instead of six. Your files, keyboard, texts, notes, and lists — no more juggling apps from five different companies. - Genuinely private. A file manager sees everything you keep. A keyboard sees everything you type. A messaging app sees everyone you know. Σ sees all three and does nothing with any of it. No servers. No analytics. No ad SDKs. No data sold. Not a promise on a policy page — how the app is built. - No ads, no accounts, no sign-up. Install it and it just works. - Yours to keep. Everything lives on your device, in your hands. BUILT DIFFERENTLY: Σ was built from the ground up — its own code, its own tools, no third-party SDKs riding along and no hidden trackers baked in. The privacy isn't a setting you switch on. It's the foundation. Make your phone yours again. — Zeta Systems LLC™