OptionBridge vs NoteLM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OptionBridge
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OptionBridge is a professional-grade tool for traders who operate across both options markets and prediction markets. By extracting implied volatility from vanilla SPX options and applying Black-Scholes digital pricing, the app calculates the true risk-neutral probability of any Polymarket event — then compares it directly to the Yes/No contract price to reveal mispricing, edge size, and the optimal trade direction. Whether you're arbitraging between IBKR and Polymarket or simply stress-testing your probability assumptions, OptionBridge gives you institutional-quality analysis in seconds, directly from your iPhone.Privacy Policy: https://sites.google.com/view/optionbridge/home/privacy-policy| Terms of Use: https://sites.google.com/view/optionbridge/home/terms-of-use
NoteLM
Transform your notes, files, and voice recordings into a private, searchable AI knowledge base. Chat with your documents and find information using semantic search, all offline and without tracking.
- Multi-format document import
- Semantic and full-text search
- Chat with your knowledge base
- Local LLM support
- 100% offline and private
- Vector search for concept matching
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NoteLM is a private personal AI assistant for your notes, documents, and ideas. Run supported AI models on your device, search your personal knowledge locally, and organize information with an AI workspace designed for focus and privacy. Use NoteLM to: • Chat with your personal knowledge • Search notes and documents • Organize ideas with AI • Import documents and extract useful information • Use OCR and voice transcription • Run focused AI agent tasks • Keep your information close to your device NoteLM helps turn scattered information into a searchable, useful personal knowledge space. Download NoteAI and build your private AI assistant. Auto-renewable subscription information: - Pro Monthly: 1-month subscription - Pro Yearly: 1-year subscription Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Privacy Policy: https://liamxavier0314.github.io/app-policies/mindvault/privacy-policy.html Terms of Use: https://liamxavier0314.github.io/app-policies/mindvault/terms-of-service.html
Screenshots
Verdict
The clearest difference is update cadence: NoteLM at every 9 days against OptionBridge's every 4 months. NoteLM also leads on device support (4 vs 1) and iOS requirement (15.1 vs 18.6). On price, ads and in-app purchases 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. OptionBridge sells 2 in-app purchases, starting at $3.99 per month and NoteLM sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.
OptionBridge ships an update every 4 months, NoteLM every 9 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.
| Parameter | OptionBridge | NoteLM |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 18.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 120 MB |
| Age rating | 4+ | 4+ |
| Developer | Nicholas Daniel | xuezai lan |
In-app purchases
OptionBridge
- OptionBridgeMonthly2$3.991 Month
- OptionBridge Annual$24.991 Year
NoteLM
- Pro Monthly1 Month trial$5.991 Month
- Pro Yearly1 Month trial$59.991 Year
- GemmaNote Pro Lifetime$149.99









