OpenCone vs Brain
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenCone
This app transforms your iPhone or iPad into a powerful RAG system. It allows you to import various document types for on-device extraction, embedding, and semantic search. Connect to your OpenAI and Pinecone accounts to build a private knowledge base for real-time, citation-backed answers.
- Multi-format document import (PDF, DOCX, TXT, code, etc.)
- On-device OCR for image text recognition
- Semantic search with streaming answers
- Real-time citations and metadata filtering
- Support for GPT-5 and other advanced models
- Secure credential management in Keychain
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OpenCone turns the documents on your iPhone into answers you can check. Bring your own OpenAI and Pinecone keys: OpenCone reads and splits your files on the phone, stores them in your own Pinecone index, and answers your questions with OpenAI, citing the passage behind each claim. ASK • Answers stream in as they're written, with headings, lists, tables and code. • Claims carry tags such as [S1]. Tap one to read the exact passage, with its file, page and score. • Follow-up questions see your earlier exchanges. • Ask by voice, with Apple's speech recognition. SEARCH ONE INDEX OR ALL OF THEM • Auto reads each question and searches the indexes and namespaces likely to hold the answer, up to five at once. Ask it to compare two and it searches both. • Everything searches every namespace of every index you include. • One index searches the index you pick, in one namespace or in each of them. • Questions are embedded with the model that built each index, so the indexes you already have work as they are. • Optional reranking with Pinecone's hosted rerankers. YOUR DOCUMENTS • Import PDFs, plain text, Markdown, RTF, HTML, JSON, XML, CSV, code and images. Text in images is recognized on the phone. • Choose the index and namespace for each upload, follow its progress, and see how long each step took: read, split, embed and store. • Create and delete indexes and namespaces, with the cloud, region and metric you choose. ANSWER SETTINGS THAT FOLLOW THE MODEL • Choose from the current GPT models, or enter any model ID your key can use. • Reasoning effort, answer length up to the model's maximum, detail, service tier, web search and code interpreter, each offered where the model supports it. • Add your own instructions to every answer. SEE EVERY API CALL • Settings lists every OpenAI and Pinecone endpoint OpenCone calls: what it's for, the settings that shape it, and how this session's requests went. PRIVATE BY DESIGN • Your keys stay in the iPhone's Keychain. • No account, no analytics, no ads, and no server in between: requests go straight from your iPhone to OpenAI and Pinecone. • Answers are requested with storage off, so OpenAI keeps no conversation between questions. • One reset removes your keys, your settings and what OpenCone learned about your indexes. OpenCone works with your own OpenAI API key and your own Pinecone API key and project. OpenAI and Pinecone bill their usage to your accounts.
Brain
Quickly capture and organize your project ideas with a structured approach. This app offers a clean interface for managing features, design, bugs, and notes, all stored locally for privacy and speed.
- Instant idea capture
- Structured project categories (Features, Design, Bugs, Notes)
- On-device data storage
- Customizable themes and accent colors
- Haptic feedback and animations
- Multi-language support
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Project Brain is the fastest way to capture and organize ideas for your projects. Whether you're building an app, designing a product, or simply collecting thoughts — Project Brain keeps everything structured and beautiful. HOW IT WORKS Create a project in seconds: name, emoji icon, status. Then start dropping ideas in instantly. Each project includes four categories: • Features — what you want to build • Design — how it should look • Bugs — what needs fixing • Notes — everything else Tap an idea to add a description. Mark it as done. Swipe left to delete. BUILT FOR CREATORS • Dark and light themes • 6 accent color presets • Animated neon background • Spring animations on every button • Haptic feedback • 7 languages — English, Russian, Ukrainian, Spanish, German, French, Portuguese • Onboarding tutorial for new users • Animated launch screen NO CLUTTER No accounts. No cloud. No subscriptions. No ads. Everything stays on your device — private and instant. Start organizing your next big project today.
Screenshots
Verdict
The clearest difference is iOS requirement: Brain at 15.1 against OpenCone's 17.6. On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | OpenCone | Brain |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Gunnar Hostetler | Yuliia Aliekseienko |
Customer experience
OpenCone
Brain
In-app purchases
OpenCone
No in-app purchases
Brain
No in-app purchases









