VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Sunday, October 5, 2025

View Diffchecker View Unusual Whales Back to Home

Head-to-head

Diffchecker vs Unusual Whales comparison

Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.

Quick takeaways

Diffchecker adds Diff View coverage that Unusual Whales skips.

Unusual Whales includes Screeners, Options & Derivatives, Portfolio, Paper Trading, Dark Pool & Off-Exchange, Alerts, News, US Government Trades, Insider Data, 13F, Data APIs, Education, Calendar, and Dividends categories that Diffchecker omits.

Diffchecker highlights: Supports multi-format comparisons: text, images, PDFs, Excel files, and folders., Desktop apps allow fully offline diffs, ensuring comparisons never leave the user’s computer., and Real-time text diffing, diff merging, dark mode, and export to PDF..

Unusual Whales is known for: Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy., Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones., and Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals..

Unusual Whales offers mobile access, which Diffchecker skips.

Diffchecker

diffchecker.com

Diffchecker is a comparison tool for text, images, PDFs, Excel files, and folders. The free Basic plan is web-only, while Pro + Desktop adds offline diffs, ad-free usage, real-time text comparison, and desktop apps. Legal and Enterprise tiers include integrations (e.g. iManage) and advanced admin features. Enterprise also offers SAML SSO, SCIM provisioning, and priority support. An API is available with free and paid plans, and a 14-day trial is offered for Pro/Desktop plans.

Platforms

Web

Desktop

API

Pricing

Free

Subscription

Quick highlights

Supports multi-format comparisons: text, images, PDFs, Excel files, and folders.
Desktop apps allow fully offline diffs, ensuring comparisons never leave the user’s computer.
Real-time text diffing, diff merging, dark mode, and export to PDF.
Syntax highlighting for 20+ programming languages with character-by-character precision.
Public HTTP API supports text, image, PDF, and Excel diffs with tiered monthly quotas and input size limits.

Community votes (overall)

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Unusual Whales

unusualwhales.com

Editor’s pick Hands-on review

Real-time options flow and dark-pool analytics built for active traders. Free plans view delayed data; paid tiers stream live flow, with annual plans unlocking data downloads. The public API is sold separately, and “Periscope” (market-wide SPX exposure) is available as an add-on.

Platforms

Web

Mobile

API

Pricing

Free

Subscription

Quick highlights

Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy.
Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones.
Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals.
Options Profit Calculator to model multi-leg strategies, Greeks, and payoff P/L.
Paper trading for both stocks and options to test ideas without risk.

Community votes (overall)

0% upvotes 0% downvotes

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Overlap

Shared focus areas

1 overlap

Both tools cover this research theme.

APIs & SDKs

Where they differ

Diffchecker

Distinct strengths include:

Diff View

Supports multi-format comparisons: text, images, PDFs, Excel files, and folders.
Desktop apps allow fully offline diffs, ensuring comparisons never leave the user’s computer.
Real-time text diffing, diff merging, dark mode, and export to PDF.
Syntax highlighting for 20+ programming languages with character-by-character precision.

Unusual Whales

Distinct strengths include:

Screeners

Options & Derivatives

Portfolio

Paper Trading

Dark Pool & Off-Exchange

Alerts

News

US Government Trades

Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy.
Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones.
Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals.
Options Profit Calculator to model multi-leg strategies, Greeks, and payoff P/L.

Feature-by-feature breakdown

Attribute	Diffchecker	Unusual Whales
Categories Which research workflows each platform targets	Shared: APIs & SDKs Unique: Diff View	Shared: APIs & SDKs Unique: Screeners, Options & Derivatives, Portfolio, Paper Trading, Dark Pool & Off-Exchange, Alerts, News, US Government Trades, Insider Data, 13F, Data APIs, Education, Calendar, Dividends
Asset types Supported asset classes and universes	Other	Stocks, ETFs, Options
Experience levels Who each product is built for	Beginner, Intermediate, Advanced	Beginner, Intermediate, Advanced
Platforms Where you can access the product	Web, Desktop, API	Web, Mobile, API
Pricing High-level pricing models	Free, Subscription	Free, Subscription
Key features Core capabilities called out by each vendor	Unique Supports multi-format comparisons: text, images, PDFs, Excel files, and folders. Desktop apps allow fully offline diffs, ensuring comparisons never leave the user’s computer. Real-time text diffing, diff merging, dark mode, and export to PDF. Syntax highlighting for 20+ programming languages with character-by-character precision. Public HTTP API supports text, image, PDF, and Excel diffs with tiered monthly quotas and input size limits. API authentication uses an email query for the free tier, and API keys for paid plans.	Unique Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy. Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones. Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals. Options Profit Calculator to model multi-leg strategies, Greeks, and payoff P/L. Paper trading for both stocks and options to test ideas without risk. Portfolio Manager with broker linking for IBKR, tastytrade, Fidelity, and Robinhood.
Tested Verified by hands-on testing inside Find My Moat	Not yet	Yes
Editor pick Featured inside curated shortlists	Standard listing	Highlighted

Frequently Asked Questions

Which workflows do Diffchecker and Unusual Whales both support?

Both platforms cover APIs & SDKs workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do Diffchecker and Unusual Whales require subscriptions?

Both Diffchecker and Unusual Whales keep freemium access with optional paid upgrades, so you can trial each platform before committing.

Which tool has mobile access?

Unusual Whales ships a dedicated mobile experience, while Diffchecker focuses on web or desktop access.

What unique strengths set the two platforms apart?

Diffchecker differentiates itself with Supports multi-format comparisons: text, images, PDFs, Excel files, and folders., Desktop apps allow fully offline diffs, ensuring comparisons never leave the user’s computer., and Real-time text diffing, diff merging, dark mode, and export to PDF., whereas Unusual Whales stands out for Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy., Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones., and Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals..

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