Twin vs Chat LLM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Twin
This app combines two calculators into one, allowing for side-by-side or stacked calculations. Easily copy and paste results between calculators or to other apps. It displays formulas for clarity and handles basic arithmetic operations.
- Two calculators in one
- Side-by-side and stacked display
- One-touch copy/paste between calculators
- Copy results to iPhone memory
- Formula display
- Basic arithmetic operations
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A simple and easy-to-use calculator app that combines two calculators into one. Calculators are displayed side by side when the screen is horizontal, and vertically when the screen is vertical. In addition to being able to perform separate calculations with each calculator, calculation results can be also copy and paste with one touch, so you can perform other calculations during calculations, making it even more convenient to use than you might imagine. There is also a free version with ads. Please try it first. https://apps.apple.com/jp/app/t-calc-lite/id1630026837?l=jp 【feature】 1. Calculation results can be copy and paste between two calculators with one touch. 2. The result calculated can be input from one calculator to the other with one touch. ・When press the "→" key, the calculation result of the left calculator is entered at the end of the formula on the right calculator. ・When press the "←" key, the calculation result of the right calculator is entered at the end of the formula on the left calculator. 3. add, subtract, multiply and divide is performed. Do multiplication and division first, then add and subtract. 4. Display the formula The entered formula is displayed under the result, so you can easily check the operations. 5. Calculation results can be copied to iPhone’s memory Calculation results can be pasted into other apps as text , so transcription errors will not occur. Example of use When you find a product for 988 yen for 3 pieces and a product for 1245 yen for 4 pieces while shopping, you can easily calculate "Which is cheaper?" And “How cheaper?"with this calculator. 1) Use the left and right calculators to find the unit price of the product (unit price = product price/number). 2) Tap the "- key" and "arrow key" on either the left or right calculator to calculate the unit price difference. Limitations ・Answer can be calculated up to 9 digits, minimum 0.000000001. Note The free version can be downloaded from https://apps.apple.com/jp/app/t-calc-lite/id1630026837?l=en
Chat LLM
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Private AI chat that works offline. Free, no account needed. Plus 300+ cloud models, real-time Grok and Gemini voice, and your computer's models via LM Studio. On-device AI for private offline chat The on-device Llama model is an optional one-tap download from the model picker. The app installs under 10 MB without it. Free cloud chat, no account needed Cloud LLM is powered by Groq and works out of the box. No signup, no key required. 300+ models via OpenRouter Connect your OpenRouter key and chat with over 300 models. A web search toggle lets any OpenRouter model pull live information — current events, prices, weather — charged to your own OpenRouter credits. Your computer's models with LM Studio Run open models in LM Studio on any Mac, Windows or Linux machine and use them from Chat LLM over a private Tailscale connection. Browse, load and unload models from the app, and connect LM Studio's MCP tool servers. No per-message credits, no content restrictions. Voice chat with Gemini Live and Grok Have natural real-time voice conversations through two backends. Google Gemini Live brings a choice of voices, Google Search grounding, and photo sharing mid-conversation. xAI Grok, now updated to Grok 3.0 real-time speech, adds a large, auto-updated voice library — use an API key or simply sign in with your xAI account. Each backend has its own system prompt and live tuning controls. Image and video generation Generate images and videos inside a conversation with OpenRouter and Grok media models. Prices show on the model cards before you generate, and generation keeps running in the background — you'll get a notification when your result lands, even if you've left the app. Reader — listen to documents and text Reader turns Chat LLM into an audiobook player for your own content. Import a .pdf, .epub, .docx or .txt file, paste text, or share any webpage or document from the iOS share sheet and Reader speaks it paragraph by paragraph. Tap any paragraph to jump to it; your position is saved automatically. Choose your voice per document from five providers: OpenRouter Kokoro for pennies, MiniMax for high quality at great value, ElevenLabs for expressive narration with your own cloned voices, Fish Audio for a vast library of community and custom voices, or xAI Grok — just sign in with your Grok account. Account voices sync automatically and can be searched and favourited. Export any document to a single audio file on your device. Pause an export any time and resume from the exact sentence — generated audio is never paid for twice. Exported files play offline with no credits used, can be shared or found in Files under Chat LLM, and keep sentence highlighting and tap-to-seek. iCloud sync Your settings, system prompts, conversations, and Reader library back up to your own private iCloud automatically and restore across your devices and after a reinstall. If you're signed out of iCloud, everything still works and stays on your device. Other features Image and document uploads in text chat (supported models) Independent system prompts per provider Advanced generation controls: temperature, top-p, and more Conversation history with model identification Vision, reasoning, and parameter-count tags on OpenRouter models Privacy Chat LLM does not require a user account. API keys are stored securely in the iOS Keychain. Your conversations and Reader library sync through your own private iCloud, tied to your Apple ID — they are never stored on our servers, and we have no access to them. When you use a third-party provider, your prompts and inputs are sent to that provider to generate a response; their own privacy and retention policies apply. Free to download. No subscription, no paywall. Optional provider usage is billed directly by the provider you choose. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ https://ferrraridave-coder.github.io/chat-llm-support/privacy-policy.html
Screenshots
Verdict
The clearest difference is price: Chat LLM at Free against Twin's $1.99. Twin's advantage is iOS requirement (15.0 vs 18.6). On update cadence, ads, in-app purchases 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
Chat LLM is free to download; Twin costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Twin ships an update fortnightly, Chat LLM every 9 days. Both last shipped on October 25, 2026.
| Parameter | Twin | Chat LLM |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (8 ratings) — better | — |
| Positive reviews | 76.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Fortnightly | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 1 MB | 26 MB |
| Age rating | 4+ | 17+ |
| Developer | Hiroyuki Ueda | David Picknell |
In-app purchases
Twin
No in-app purchases
Chat LLM
No in-app purchases









