SQQuantum vs Lochan
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
SQQuantum
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SQQuantum Studio: The Universe in Your Hands Welcome to SQQuantum by Sapiens Qualiaβa breathtaking leap in mobile scientific computing. SQQuantum bridges the gap between high-end desktop tensor analysis and accessible mobile education, putting a fully functional, lightning-fast quantum circuit simulator directly onto your iPhone and iPad. Whether you are a university physics student learning the fundamental mechanics of entanglement, a software engineer transitioning into quantum logic, or a researcher testing state-vector mathematics on the go, SQQuantum provides a flawless, professional-grade Integrated Development Environment (IDE) optimized specifically for the Apple ecosystem. OPTIMIZED FOR APPLE SILICON SQQuantum is an engineering masterpiece. Under the hood, it is powered by a custom-written, native C++ state-vector engine utilizing the heavy-duty Eigen mathematical framework. By bridging Swift directly to C++ and compiling natively for Appleβs A-Series and M-Series processors, the app achieves zero-latency, real-time matrix multiplications entirely offline. It natively projects complex quantum physics calculations onto a beautifully fluid, hardware-accelerated SwiftUI canvas without dropping a single frame. POWERFUL FUNCTIONALITY β’ Dynamic Circuit Canvas: Build complex quantum circuits using multiple qubits. Apply fundamental quantum logic gates including Hadamard (H), Pauli (X, Y, Z), Parametric Phase Shifts (Rx), Controlled-NOT (CX), and Measurement operations. β’ Interactive 3D Bloch Sphere: Visualize the invisible. Utilizing Appleβs native SceneKit framework, our 3D projector allows you to touch, drag, and rotate the Bloch sphere to intuitively understand qubit vector phases and superpositions in real-time. β’ Live Probability Distributions: As you build your circuit or drag parameters, the simulator instantly calculates the wave function and renders the exact probability distribution of your quantum states in a vibrant, responsive UI. β’ Hardware Noise Simulation (NISQ): Experience the reality of modern hardware. Use the dynamic noise slider to inject probabilistic decoherence and environmental noise into your gates, simulating how physical quantum computers actually behave. β’ Live OpenQASM 3.0 Generation: SQQuantum acts as a true developer tool. As you visually construct your circuit, the app simultaneously compiles industry-standard OpenQASM 3.0 code in a dedicated terminal pane. Copy it with one tap to export and run your exact circuit on real IBM or AWS quantum mainframes. β’ Instant Entanglement: Instantly load complex quantum phenomena like the Bell State (Quantum Entanglement) and GHZ State with a single tap. PRO iPadOS ARCHITECTURE SQQuantum intelligently adapts to your hardware. On the iPhone, it provides a sleek, highly readable, vertically scrollable interface. On the iPad, the UI transforms into a gorgeous, split-pane professional IDEβfeaturing a sprawling mathematical workspace on the left, a dedicated hardware inspector on the right, and a full-width code terminal pinned to the bottom. 100% PRIVATE & OFFLINE Science requires focus, not tracking. SQQuantum is 100% offline. It requires zero account sign-ups, utilizes zero cloud processing, contains no advertisements, and collects absolutely zero user data. Your algorithms belong to you. Step into the mathematical fabric of the universe. Download SQQuantum Studio today and start building the future.
Lochan
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Your coding agents keep working when you step away. Lochan is how you keep up with them, calmly. When Claude Code, Codex or any other agent on your computer stops to ask a question, open its real terminal on your phone, read what it did, and answer. Then get back to your walk. A CALM VIEW OF A BUSY HERD Every agent on the machine at a glance, with a line on where each one left off. The ones waiting on you always come first. - Tiles: the whole herd as a grid that moves as your agents do - Board: Blocked, Working, Done and Idle as columns you swipe through - Projects: agents grouped by the project they are working in ASK THE SHEPHERD One question, the whole herd. The Shepherd is an agent on your computer that reads every other pane. Ask it what needs you, what changed or whether anything is stuck, and it answers from what is on the screens, with a link to each pane it mentions. It runs Claude Code by default, or Codex, Pi, OpenCode or Grok. ANY AGENT CAN JOIN THE HERD Lochan does not plug into your agent. It opens the terminal the agent is already running in, so it works with Claude Code, Codex, Gemini CLI, Grok, OpenCode, Aider and anything else with a prompt. A new agent works the day it ships. A REAL TERMINAL, IN YOUR POCKET Tap any agent for the actual session: full output, scrollback and a keyboard. MAKE THE KEYS YOUR OWN Two rows of keys sit above the terminal. Drag any key to either row, switch off the ones you never use, and add your own: - Text keys for the commands you repeat, like /compact, /usage or /model sonnet - Chord keys for Ctrl, Option and Shift combos, like your tmux prefix or Ctrl-R SHARE A SCREENSHOT WITH YOUR AGENT Pick a photo, take one of the screen in front of you, or send a file. It lands on your computer and its path goes into the prompt, ready for you to finish and send. SAY IT. CHECK IT. SEND IT. Dictate a long instruction, read the transcript, and send it only when it reads right. Or write it in a real text box, with a draft that waits if you get pulled away. RUN THE HERD FROM YOUR PHONE Start a new agent in any project, rename it, and close it when it is done. BUILT FOR A PHONE Lochan tells each agent it is being driven from a phone, so it leads with the answer, keeps replies short and batches its questions. PAIRED IN ONE SCAN Run one line on your Mac or Linux machine, then scan the code it shows. Your phone makes its own key, and it stays in the phone's Keychain. Nothing to type, no private key to copy. Save every machine you own and switch between them from the title bar. No account, and no Lochan server in between: your phone talks to your computers over SSH. Away from home you need a route to them, and Tailscale is the two-minute version. ALSO IN LOCHAN: A PRIVATE AI CHAT Chat with Apple's on-device model, open models downloaded to your phone, or cloud models with your own API key. Conversations branch instead of overwriting, and you can share one with a link we cannot read. Lochan works with Herdr, the terminal workspace for AI coding agents, on the computers you own.
Screenshots
Verdict
The clearest difference is update cadence: SQQuantum at every 2 days against Lochan's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
SQQuantum ships an update every 2 days, Lochan fortnightly. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.
| Parameter | SQQuantum | Lochan |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days β better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.2 | 26.0 β better |
| Further details β not scored | ||
| Size | 3 MB | 63 MB |
| Age rating | 4+ | 17+ |
| Developer | Menelaos Malaxianakis | Purplecones, LLC |
In-app purchases
SQQuantum
No in-app purchases
Lochan
No in-app purchases









