Notes Calculator vs opchat

Notes Calculator is a smart text calculator: a notepad that does the math as you type. Write your calculations in plain language, one line at a time, and the answer appears inline: - Currencies: 100 USD to EUR - Units: 3 km + 500 m in miles - Dates: today + 3 days, or the days between two dates - Percentages: 20% of 250, or 80 + 15% - Variables: give a value a name and reuse it - Running totals: total, sum, average, previous, and line references Everything updates live as you edit, so you can play with the numbers and watch the results follow. Works on iOS, iPadOS, MacOS and other platforms as well. What do I get extra with Lifetime access (single-time purchase)? - Unlimited notes - Sync notes across devices - Premium support Questions or feedback? support@mariuti.com. We read every message. Privacy Policy: https://notescalculator.com/privacy-policy Terms and Conditions: https://notescalculator.com/terms-and-conditions

opchat lets you chat with all major AI models in one place — using your own API keys or running models directly on your device. Your API keys stay on your device, encrypted with secure storage. Your conversations go directly to the AI provider you choose and never pass through our servers. No middleman, no subscriptions, no ads. BRING YOUR OWN KEYS Connect OpenAI (GPT), Anthropic (Claude), Google (Gemini), DeepSeek, OpenRouter, Straico, Azure, Ollama, or any OpenAI-compatible endpoint. Switch between models mid-conversation or set a default per persona. ON-DEVICE MODELS Run AI models directly on your device — completely offline, no API key needed. Browse and download models from Hugging Face. Your data never leaves your phone. Perfect for privacy-sensitive use or when you're offline. YOUR PHONE, YOUR APPS • Calendar — ask what's on your schedule or add events, across every calendar on your phone (Google, Outlook, iCloud) • Reminders & Contacts — add to your lists, look up a number or a birthday • Notion, Google Workspace, Todoist, Linear, Jira & Confluence — connect in a tap • MCP servers — add any tool server by URL • Your own skills — describe an API and the AI builds the connector BUILT-IN TOOLS • Web search and page reading with your own Serper, Tavily or Firecrawl key • Image generation & editing • Memory — the AI remembers what matters across conversations • Reminders and to-do lists • Dictation and read-aloud CUSTOM PERSONAS Create AI assistants tailored to your needs. Set a system prompt, personality, speaking style, knowledge areas, and conversation starters. ORGANIZE YOUR WORK Group conversations into projects. Pin important chats. Search across all your history. Export conversations as Markdown or JSON. FULLY CUSTOMIZABLE Choose from multiple themes or create your own with custom colors. Pick from 23 fonts. Adjust message density, roundness, and font size. FREE AND PRO Free forever: chat with one cloud AI provider of your choice, on-device models, web search, memory, reminders, dictation and one persona. Pro is a one-time purchase — no subscription: all your AI providers at once, Standby and hands-free voice mode, integrations and MCP, your own skills, image generation, unlimited personas, all themes and fonts. PRIVATE BY DESIGN No ads and no data selling. Your API keys are encrypted on-device, and your conversations go straight to your chosen AI provider — we never see them. The app sends anonymous usage statistics and crash reports to help us improve it. Use on-device models or Ollama for fully local AI with no data leaving your phone. AI-GENERATED CONTENT All responses are generated by third-party AI models and may be inaccurate or incomplete. Content safety is enforced by each provider's built-in policies. You can report any AI-generated response directly within the app. Terms of Use: https://opchat.app/terms Privacy Policy: https://opchat.app/privacy