CyberTools vs Letrin

CyberTools is an iOS network utilities app that brings common “power-user” diagnostics into one clean interface. From the Home screen, you get a quick list of tools—each designed with the same workflow: simple inputs at the top, a clear primary action (Run/Start), and a scrollable, selectable output area for results, logs, and responses. You can also copy results to the clipboard and share them when needed. The app includes the following capabilities: Ping: Test reachability to a host with configurable packet count and an option to prefer IPv6. Results are shown live as output text. Traceroute (with map view): Trace the route to a target with a max-hop limit and IPv6 preference. You can view hops as a list and visualize them on a map, including RTT/timeout per hop. Public hop locations are geolocated for the map (with private addresses filtered out). DNS Lookup: Resolve domains to records with a selectable record type and an optional custom name server (falling back to system DNS when left blank). Outputs A/AAAA-style results as text. Host Location: Resolve a host name or IP (IPv4/IPv6 supported) and display its location on a map. It also shows distances to each resolved address and draws great-circle paths from your current location when available. iPerf3 (network performance testing): Run iPerf3 in server or client mode to measure throughput. The client supports a configurable duration and an optional reverse mode. TCP Tool (client/server): Test TCP connectivity and messaging. In client mode, connect to a TCP server, send an optional message, and receive data until you disconnect. In server mode, CyberTools listens for incoming connections and can send messages back to the connected client. UDP Tool (client/server): Test UDP messages reachability to remote peers. HTTP Tool (client/server/proxy): A full HTTP testing suite: - Client: Build requests with method, URL, headers/cookies, and body content; send requests and inspect responses (Body/Headers/Raw). - Server: Run an HTTP echo server with configurable routes and responses, logging incoming requests. - Proxy: Run a local intercepting HTTP/HTTPS proxy to capture traffic and record requests for later replay. Interface Info: Refresh and inspect network interfaces, addresses, and routing-related information. Results are organized into expandable sections and presented in copy-friendly tables. Network Monitor: View live upload/download rates and per-interface history curves. It also supports Live Activity / lock-screen-style updates, with optional location-assisted refreshing for more frequent background updates. CyberTools is built for hands-on troubleshooting, testing, and measurement—especially when you need actionable network insight directly on your device.

Dutch letters are hard to read even if you speak Dutch. Photograph one and Letrin tells you, in your own language, what it says, what it wants from you and by when. It works on any letter you cannot read. A tax assessment or a fine, yes, but also a rent increase, a hospital bill, a notice from the housing association, a letter from a school, an insurer or a neighbour. If it is on paper, Letrin will read it. THE PHOTO NEVER LEAVES YOUR PHONE The text is read on the device itself, offline. Only the text you approve is sent, and only to write the explanation. No copy of your letter is kept. No account, no sign-in, no history. YOUR DETAILS ARE HIDDEN AUTOMATICALLY Name, address, BSN, IBAN, phone number and reference numbers are found and hidden before anything leaves. You see exactly what will be sent, and you can hide more yourself. WHAT YOU GET • What kind of letter it is and who sent it • What is being asked of you, in one sentence • Step by step what to do • Dates and amounts, with the deadline called out • What to watch for: penalties, objection windows, common mistakes • A reply in correct Dutch for you to check and send yourself • A reminder before the deadline, and the date in your calendar IN 19 LANGUAGES Dutch, English, Turkish, Arabic, Polish, Ukrainian, Russian, German, French, Spanish, Portuguese, Italian, Romanian, Bulgarian, Persian, Hindi, Chinese, Indonesian and Vietnamese. WHAT IT COSTS Every phone gets three explanations free. After that there are two ways to carry on. Letrin Plus is a subscription: 20 credits every 30 days, with reply drafts and calendar export. • A monthly plan, renewed every month • A yearly plan, renewed every 12 months There is no free trial; the three free explanations take its place. Payment is charged to your Apple Account when you confirm. A subscription renews automatically unless you cancel at least 24 hours before the period ends. Manage or cancel it in your Apple Account settings; deleting the app does not cancel it. The price of each plan is shown in the app, in your own currency, before you confirm, and differs by country. Credit packs are bought once and never expire: 1, 5 or 15 credits. Nothing renews. A pack is only used once a subscription allowance has run out. AN AI WRITES THE EXPLANATION, AND IT CAN BE WRONG Letrin reads your letter with an AI model. It can misread a blurry photo, miss a detail, or get an unusual letter wrong. Treat what it says as help with understanding, not as a final answer, and always check dates, amounts and deadlines against the letter itself. Letrin is not legal, tax, immigration or financial advice, and it is not a lawyer or an adviser. For anything with real consequences, contact the organisation that wrote to you, or free legal help at het Juridisch Loket. Privacy policy: https://letrin.app/en/privacy/ Terms of use: https://letrin.app/en/terms/