IOU vs Source Note
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IOU
Create professional agreements and manage payments effortlessly. Draft documents using AI, e-sign, and track invoices and due dates in one organized platform. Secure sign-in ensures your data is protected.
- AI-powered agreement drafting
- E-signature functionality
- Payment and invoice management
- Due date reminders
- Dispute tracking
- Secure sign-in
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IOU helps you create clear, professional agreements and keep payments on schedule, without the back‑and‑forth. Draft with AI in chat or voice using ready‑made templates, then e‑sign, export to PDF, and manage invoices, due dates, and reminders in one place. Powerful search, dispute tracking, and a built‑in assistant keep everything organized, with secure sign‑in via Apple or Google. Terms of Use: https://ioumarker.com/legal#terms Privacy Policy: https://ioumarker.com/legal#privacy Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Source Note
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Capture Every Product. Decide with Confidence. Meet your AI-powered sourcing companion — built for modern procurement professionals who need speed, clarity, and structure in every sourcing moment. Whether you're at a trade show, supplier meeting, or factory visit, capture product photos, record conversations, and transform everything into clean, structured sourcing data instantly. FROM CHAOS TO CLARITY — IN ONE FLOW Stop switching between product photos, voice notes, and spreadsheets. With one simple workflow, you can capture, organize, and structure everything: - Take product photos - Record conversations - Let AI convert everything into structured, usable data From raw input to decision-ready output — seamlessly. KEY FEATURES Photo + Voice → Structured Sourcing Data - Capture products naturally through photos and voice. - Powered by advanced large-scale AI models, the app extracts and structures key product information with high speed and accuracy. Capture Products Your Way - Snap or upload anytime, ensuring no detail is missed. - Important product information is detected and organized automatically. AI-Powered Data Extraction - Skip manual entry. - Specifications, pricing, and MOQ are intelligently identified and structured into clear formats. Capture While Recording - Link products directly to real conversations, preserving full sourcing context. Auto Transcription & Smart Summaries - Convert long discussions into concise, actionable insights. - Quickly identify key suppliers, product details, and decisions. Instant Product Catalog Generation - All sourcing data is automatically organized into structured catalogs, ready for review and comparison. Export Clean, Structured Data - Generate professional reports in PDF or Excel format for easy sharing and decision-making. Supplier Contact Management - Quickly scan and save supplier information to build and manage your network efficiently. Find & Compare with Ease - Track sourcing history clearly and revisit product information without friction. BUILT FOR REAL PROCUREMENT WORK Designed for real-world sourcing scenarios: - Trade shows and exhibitions - Factory visits - Supplier meetings - On-the-go procurement No more scattered notes. No more missing details. Only structured, reliable data — ready when you need it. WHY YOU’LL LOVE IT - Save hours of manual documentation and follow-ups. - Work with structured data instead of fragmented inputs. - Make faster, more confident sourcing decisions. - Rely on advanced AI models for fast and accurate information capture. SUBSCRIPTION & PRICING Unlock the full power of AI sourcing: - Unlimited sourcing notes & reports - Automated product catalogs - Full AI transcription & summaries - Professional PDF & Excel exports Plans: - Weekly Plan: $5.99/week (3-day free trial) - Yearly Plan: $59.99/year - Payment will be charged to your Apple ID account upon confirmation of purchase - Subscription renews automatically unless canceled at least 24 hours before the end of the current period - You can manage and cancel subscriptions in your App Store account settings Additional Information: - Payments will be billed to your App Store Account upon confirmation. - Subscriptions automatically renew within 24 hours of the end of the current period, unless canceled. - Users have the right to manage subscriptions and disable auto-renewal through the Account Settings after purchase. Privacy Policy: https://sourcenote.topmusetech.com/privacy_policy.html Terms of Use: https://sourcenote.topmusetech.com/terms_of_use.html START SOURCING SMARTER TODAY From the first capture to the final decision, this is sourcing — streamlined, structured, and powered by advanced AI. SHARE YOUR FEEDBACK We'd love to hear your feedback and feature suggestions! Contact us at: sourcenote.support@topmusetech.com
Screenshots
Verdict
The clearest difference is ads: Source Note at none against IOU's shown. Source Note also leads on iOS requirement (15.0 vs 18.4). IOU's advantage is update cadence (every 4 days vs every 2 weeks). On price, 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
Both are free to download. IOU sells 1 in-app purchase, starting at $9.99 per month and Source Note sells 2 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.
IOU ships an update every 4 days, Source Note every 2 weeks. The most recent releases landed on September 28, 2026 and September 24, 2026 respectively.
| Parameter | IOU | Source Note |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 4 days — better | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 18.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 148 MB | 45 MB |
| Age rating | 17+ | 4+ |
| Developer | IOU Marker | TOPMUSE PTE. LTD. |
In-app purchases
IOU
- IOU Pro$9.991 Month
Source Note
- Source Note,1week3 Days trial$5.997 Days
- Source Note,1year$59.991 Year


