Comparison

ApiCatcher vs FlowSpy

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) Ultimate Monthly (1 month) b) 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

FlowSpy

Features
Read full description

FlowSpy is an AI-powered network debugging tool for developers, QA engineers, and security researchers. Capture, inspect, filter, replay, analyze, and export HTTP/HTTPS traffic directly on iPhone and iPad. [LOCAL VPN CAPTURE] FlowSpy uses a local VPN and on-device proxy to capture HTTP/HTTPS traffic. The VPN is only used for local network debugging. It does not provide remote VPN service, anonymization, censorship circumvention, network acceleration, or remote traffic forwarding. [HTTPS INSPECTION AND CERTIFICATE GUIDE] To inspect HTTPS payloads, users must explicitly install and trust a self-signed CA certificate generated locally on the device. FlowSpy provides guided setup steps, and users can stop capture, remove the VPN configuration, or clear certificates at any time. [AI ANALYSIS] Local rule analysis is available by default and does not upload data. Pro cloud AI analysis only runs when the user explicitly starts analysis for selected traffic. It helps identify anomalous requests, performance issues, security risks, and suggested fixes. [DEVELOPER WORKFLOW] • Browse requests grouped by domain • Filter by method, status code, host, protocol, and content type • Inspect headers, body, cookies, timing, and response payloads • Replay requests and edit parameters before replaying • Export HAR, JSON, CSV, and cURL • Scan token, cookie, and privacy-field risks [PRIVACY FIRST] Captured traffic is stored locally on the device by default. FlowSpy does not include advertising SDKs and does not track users across apps or websites. Use packet capture and HTTPS inspection only on devices, apps, websites, and networks you are authorized to inspect. [SUBSCRIPTION INFORMATION] FlowSpy offers a free tier and Pro auto-renewable subscriptions: Free tier: • Basic packet capture • Local rule analysis • 3 free daily uses each for AI analysis, advanced filters, and professional export Pro Monthly: • $9.99 / month • Unlocks unlimited AI analysis, advanced filters, and professional export Pro Annual: • $59.99 / year • Saves 50% each year compared with monthly billing • Unlocks the same Pro features as the monthly plan Payment will be charged to your App Store account. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel subscriptions in your App Store account settings. Actual pricing and duration are shown in the App Store purchase confirmation sheet. Privacy Policy: https://flowspy.bytestrans.info/privacy.html Terms of Service: https://flowspy.bytestrans.info/terms.html Support: smartnetworkinc@hotmail.com

Screenshots

ApiCatcher4 screens
FlowSpy4 screens

Verdict

The call

The clearest difference is chart position: ApiCatcher at #141 against FlowSpy's unranked. On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ApiCatcher sells 4 in-app purchases, starting at $9.99 per month and FlowSpy sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 10 level
ApiCatcher versus FlowSpy: the parameters behind the verdict, then further details
ParameterApiCatcherFlowSpy
PriceFreeFree
Rating5.0 (6 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings6 — better—
Update frequencyEvery 5 days—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#141 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size57 MB4 MB
Age rating4+4+
DeveloperNanning Signalling Network Technology Co., LtdChongqing Spell Technology Co., Ltd.

In-app purchases

4 purchases

ApiCatcher

Subscriptions2
  • Ultimate$9.991 Month
  • Ultimate$49.991 Year
One-time2
  • Lifetime Pro$39.99
  • Lifetime Ultimate$89.99
2 purchases

FlowSpy

Subscriptions2
  • FlowSpy Pro Monthly$9.991 Month
  • FlowSpy Pro Annual$59.991 Year

Questions

Is ApiCatcher free?
ApiCatcher is free to download, with in-app purchases available.
Is FlowSpy free?
FlowSpy is free to download, with in-app purchases available.
Do ApiCatcher or FlowSpy have ads?
Neither ApiCatcher nor FlowSpy shows ads.

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