Comparison

ApiCatcher vs FlutterUnit

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ApiCatcher

This tool captures and debugs HTTP/HTTPS traffic on your mobile device. It allows you to modify, resend, and analyze requests, generate API documentation, and apply custom rules for flexible customization. All data is stored locally for privacy.

Highlights
  • Capture HTTP/HTTPS traffic
  • Modify and resend requests
  • Generate API documentation
  • Rewrite and script rules
  • Export traffic as HAR files
  • API scanning and statistics
Features
Read full description

ApiCatcher is a user-friendly mobile HTTP/HTTPS/WS/WSS packet capture and debugging tool. ApiCatcher also offers macOS and Windows versions (ApiCatcher Desktop), and the ApiCatcher can sync captured traffic to ApiCatcher Desktop in real time. [Key Features] • Traffic Capture: Capture HTTP, HTTPS, WS, and WSS traffic (WS: WebSocket; WSS: WebSocket over TLS). • Data Manipulation: Copy, export, encrypt, and decrypt Query Params, Headers, and Bodies. • Host Filtering: Configure blacklists and whitelists to filter captured hosts. • Request Replay: Modify and resend requests. • Combo Replay: Schedule and execute multiple requests sequentially based on dependencies, with support for dynamic parameter injection. • Scheduled Replay: Automate and trigger request replays at set intervals. • Auto-Generated API Docs: Automatically generate API documentation and export directly to Postman or Apifox. • Rewrite Rules: Mock responses, redirect requests, modify requests/responses, or drop requests/responses. • Scripting Engine: Extend capabilities with script plugins to flexibly modify requests and responses on the fly. • History Export: Batch export captured traffic as HAR files. • API Scanner: Run rule-based vulnerability/error detection and statistics on captured traffic, with support for custom scanning rules. • Media Export: Batch export images and videos, with automatic merging for segmented download requests. • Real-Time Sync: Stream captured HTTP/HTTPS traffic instantly to ApiCatcher Desktop for advanced analysis and debugging. It also supports syncing to Burp Suite, which requires installing the plugin provided by ApiCatcher on Burp Suite. • DNS mapping/spoofing: Bypass DNS resolution by sending requests for specified domain names to a designated IP address, achieving an effect similar to editing the hosts file on a computer. • Support decoding request/response bodies encoded with the Protobuf protocol, such as gRPC requests. If a .desc descriptor file is provided, field names can also be decoded. [Personalization Settings] • Configurable code highlighting styles with multiple built-in themes, supporting JSON/XML/HTML/JS. • AI assistant mode available: directly capture and analyze packets through AI dialogue. [How It Works] ApiCatcher establishes a local VPN connection on your device to route all network traffic through a local Man-in-the-Middle (MITM) service. As long as the VPN is active, ApiCatcher can capture any HTTP/HTTPS/WS/WSS traffic passing through Wi-Fi or cellular data. [Data Privacy & Security] ApiCatcher's root certificate is a self-signed certificate generated entirely on your own device. All captured HTTP/HTTPS/WS/WSS data is stored locally on your device and is never uploaded to any remote servers. [Description of automatic subscription service] 1.Subscription service: a) Pro Monthly (1 month) b) Pro Yearly (12 months) c) Ultimate Monthly (1 month) d) Ultimate Yearly (12 months) 2.Payment: After the user confirms the purchase and makes payment, it will be credited to the iTunes account 3.Automatic renewal: Apple iTunes account will be charged within 24 hours before the expiration date, and the subscription period will be extended by one subscription period after the successful deduction 4.Close the service: You can close the service by going to "Settings" on your iPhone, entering "iTunes Store and App Store", clicking on "Apple ID", selecting "View Apple ID", entering the "Account Settings" page, clicking on "Subscriptions", and managing automatic subscription services. If you need to cancel, you can close it 24 hours before the end of each billing cycle, and no further charges will be deducted within 24 hours before the expiration date 5.Service Agreement: https://apicatcher.net/en/terms-of-service 6.Privacy Agreement: https://apicatcher.net/en/privacy-policy

About

FlutterUnit

Features
Read full description

FlutterUnit is a widget explorer and development reference designed for Flutter developers and learners. Quickly discover Flutter widgets, inspect their properties and use cases, interact with live examples, and view the implementation code behind each demo. The examples are rendered with real Flutter widgets rather than static images, so you can interact with them and observe their behavior directly. Key features: • Flutter Widget Library Browse a rich collection of essential and advanced widgets organized by functionality. • Interactive Examples Experience layouts, gestures, animations, painting, scrolling, and other widget behaviors through live demos. • Properties and Usage Review widget descriptions, important properties, related types, and common usage patterns. • Example Code View the Flutter code behind each demonstration and learn how widgets are configured and composed. • Related Widget Navigation Move quickly between related widgets such as Row, Column, Flex, Expanded, and Spacer to build a clearer understanding of the framework. • Search and Favorites Find widgets by name and save frequently used content for quick access during development. • Flutter Plugin Library Explore plugins for state management, UI, networking, data storage, and more. Review platform support, versions, popularity, and essential package information. • Painting and Learning Resources Explore Flutter painting, layouts, animation, gestures, and practical development knowledge. FlutterUnit is useful for beginners learning Flutter, experienced mobile developers, and anyone who needs a convenient widget reference during daily development. FlutterUnit is open source. Contributions, feedback, and ideas are welcome on GitHub.

Screenshots

ApiCatcher4 screens
FlutterUnit4 screens

Verdict

The call

The clearest difference is in-app purchases: FlutterUnit at none against ApiCatcher's 4. FlutterUnit also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ApiCatcher sells 4 in-app purchases, starting at $9.99 per month. FlutterUnit asks for nothing beyond the download.

UpkeepUpdate frequency

ApiCatcher ships an update every 5 days, FlutterUnit every 8 days. The most recent releases landed on October 14, 2026 and October 2, 2026 respectively.

Scorecard2 real differences · 8 level
ApiCatcher versus FlutterUnit: the parameters behind the verdict, then further details
ParameterApiCatcherFlutterUnit
PriceFreeFree
Rating4.8 (8 ratings) — better—
Positive reviews93.3% of reviews—
Number of ratings8 — better—
Update frequencyEvery 5 days — betterEvery 8 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.015.0 — better
Further details — not scored
Size65 MB37 MB
Age rating4+4+
DeveloperNanning Signalling Network Technology Co., Ltd德立 张

In-app purchases

4 purchases

ApiCatcher

Subscriptions2
  • Ultimate$9.991 Month
  • Ultimate$39.991 Year
One-time2
  • Lifetime Pro$39.99
  • Lifetime Ultimate$89.99
None

FlutterUnit

No in-app purchases

Questions

Is ApiCatcher free?
ApiCatcher is free to download, with in-app purchases available.
Is FlutterUnit free?
FlutterUnit is free to download, with no in-app purchases.
Do ApiCatcher or FlutterUnit have ads?
Neither ApiCatcher nor FlutterUnit shows ads.
Which is updated more often, ApiCatcher or FlutterUnit?
ApiCatcher ships an update every 5 days, and FlutterUnit every 8 days. Most recently, ApiCatcher was updated on October 14, 2026 and FlutterUnit on October 2, 2026.

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