Cipher vs Ki
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cipher
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Cipher turns your voice into organized notes — and now into reminders and calendar events too. 100% free. 100% on-device. Speak freely, AI does the rest. No account. No cloud. No subscription. Open the app and talk. WHAT IT DOES Tap record and speak. Cipher transcribes you in real time, then AI structures everything automatically: • A clean title and short summary • A project tag (Personal, Work, Health, Finance, or your own) • Searchable keywords NEW: AI THAT ACTUALLY DOES THINGS Cipher's AI doesn't just read your notes — it acts on them. • "Remind me to call Mom on Friday" → real reminder, on your iPhone • "Schedule a call with Sarah next Tuesday at 3pm" → calendar event, created • "Find me a free hour this week" → AI checks your calendar and suggests slots • Todos with deadlines can become reminders automatically Every action asks for your confirmation first. Nothing happens behind your back. ASK FLOW — CHAT WITH YOUR NOTES A built-in AI chat that already knows what you've recorded. • Ask anything about your past notes — "what did I say about Q3?" • Summarize a day, a week, or a project in one tap • Brainstorm with an AI that builds on your own ideas PRIVATE BY DESIGN • 100% on-device AI — works offline, on a plane, anywhere • No login, no sign-up, no tracking, no analytics • Your voice and notes never leave your phone • Stored in your iPhone's secure storage FREE FOREVER No subscription. No paywall. No in-app purchases. Use every feature, forever, without paying. CHOOSE YOUR AI Pick from a wide range of free open-source AI models that run entirely on your device — from lightweight options that work on any iPhone to larger, higher-quality models for newer devices. Cipher recommends the right one for your phone. Prefer cloud AI? Bring your own key from OpenAI, Anthropic, Google, Groq, DeepSeek, or OpenRouter. Your key, direct to the provider — no middleman, no markup. SMART TODO EXTRACTION AI catches action items from natural speech — "I need to," "remember to," "should," "have to" — and pulls out deadlines automatically. View every todo across every note in one place. PROJECT ORGANIZATION Notes auto-sort into projects. Create your own. See note counts and todo progress at a glance. WHO IT'S FOR • Students capturing lecture thoughts • Founders dumping ideas between meetings • Writers thinking through drafts out loud • Anyone whose best ideas show up while walking, driving, or in the shower Cipher is for people who think out loud. Capture the thought — let AI do the organizing, and now, the scheduling too.
Ki
Capture, organize, and connect all your learning in one place. This app allows you to save notes, links, code snippets, and ideas, then link them together to build a web of knowledge. Find anything fast with full-text search and visual knowledge graphs.
- Capture notes, links, quotes, code snippets, and ideas
- Organize with color-coded tags and custom topics
- Connect notes with bidirectional linking
- Visualize knowledge with interactive graphs
- Full-text search and saved searches
- Quick capture via floating button and widgets
- Review workflow for managing notes
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Ki-note is your personal knowledge base. Capture, organize, and connect everything you learn — all in one place. CAPTURE EVERYTHING • Notes, links, quotes, code snippets, ideas, and references • Quick capture with a floating + button from anywhere in the app • Save source URLs and titles for web content. You can share links from Safari to Ki-note! • Tag code snippets with their programming language (Swift, Python, JavaScript, TypeScript, Go, Rust) • You can insert notes, text, links, into Ki-notes using the Share functionality • You can insert notes using voice in the Control Center widget or using a shortcut with Siri ORGANIZE YOUR WAY • Tags — color-coded labels to categorize your notes • Topics — group related notes under a single theme with custom icons • Smart Collections — automatic filters like Inbox, Favorites, Reading Queue, Unreviewed, Quotes, Ideas, Links, Untagged, and Unlinked • Configurable Quick Access dashboard on the home screen • Pin, favorite, and archive notes • Review workflow — track notes from Inbox → Unreviewed → Reviewing → Reviewed CONNECT YOUR KNOWLEDGE • Link notes together to build a web of ideas • Bidirectional linking — see which notes link to and from each note • Interactive Knowledge Graph — visualize all your notes and their connections • Customizable graph settings for colors, forces, and display options FIND ANYTHING FAST • Full-text search across all notes • Save frequently used searches for quick access • Browse by tags and topics • Filter by note type, status, or collection BUILT FOR YOU • 100% free — no ads, no subscriptions, all features unlocked • Local-first — your data stays on your device with SwiftData • Localized in 6 languages: English, Spanish, French, German, Italian, and Portuguese • Light and dark mode with customizable themes • Optional one-time tip to support development Ki-note is designed for students, researchers, developers, writers, and anyone who wants to build a personal knowledge base that grows with them.
Screenshots
Verdict
The clearest difference is in-app purchases: Cipher at none against Ki's 1. Cipher also leads on iOS requirement (16.0 vs 18.6). Ki's advantage is update cadence (every 2 days vs every 5 weeks). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Ki sells 1 one-off in-app purchase. Cipher asks for nothing beyond the download.
Cipher ships an update every 5 weeks, Ki every 2 days. The most recent releases landed on October 2, 2026 and October 18, 2026 respectively.
| Parameter | Cipher | Ki |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 69 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Agrima Pandey | Juan Casanueva |
In-app purchases
Cipher
No in-app purchases
Ki
- Buy me a coffee$0.99









