Products

Castle

Uses AISkill

Stop bots and account abuse at scale

castle.io Security & Privacy / Fraud Prevention & Verification

AI Benchmark
Desktop
Mobile
Monthly visits
28K
Down41.4%MoMOct 2026
Public revenue
Undisclosed
No public revenue evidence yet
Entry price
$200/mo
Higher than 95% of peersNiche median $19/mo
Creators
Sebastian Wallin
@jimtegel· 157 followers
Launched
11y ago
2015-02-16 · Est.

Traffic

Monthly visitsData through Oct 2026
Events13 changes

Marketing moves

Launches, search & content, referrals, promotions
X accounts@castle_io@jimtegel

  • Launched on Product HuntLaunch

    The easiest way to protect your users from getting hacked

    Jan 26, 2016 · 10y agoLaunch page

  • Launched on Product HuntLaunch

    Bank level security for developers

    Feb 16, 2015 · 11y agoLaunch page

  • Launched on BetaListLaunch

    Castle – Bank-level security for developers — Bank-level security for developers

    Feb 16, 2015 · 11y agoLaunch page

MCP Server & Agent Ecosystem

GitHub · MCP / Skill

Agent, MCP & Developer Integration

Agent SkillCLI / SDKAPI
Ecosystem & integrations:
Slack
Exposed tool capabilities:
Bot DetectionAccount Takeover PreventionIP ReputationIP intelligenceDevice fingerprintingBot detection
Browse developer & CLI tools →

Traffic sources

Oct 2026

Traffic breakdown

Channels

  • Organic Search78%
  • Direct15%
  • Social4%
  • Referrals3%

Countries

  • India34%
  • United States12%
  • Brazil7%
  • Indonesia5%
  • United Kingdom4%

Search

Domain authority —Domain registered 2014-12-27

KeywordMonthly volume
castle256.6K
castle app15K
castle login2,370
castleapp870
castle website login710

Traffic data: Vaneform

Pricing

Free
Free
Includes $5 of API usage · 5,000 IP lookups, or 1,000 Risk API calls · 3 days data retention · 3 seats, 1 environment
Pro
$200/mo
Includes $200 of API usage · 200,000 IP lookups, or 40,000 Risk API calls · Higher rate limits (5 API requests / second) · 7 days data retention · 5 seats, 2 environments
Enterprise
$4,000/mo
No rate limits · Up to 18 months data retention · Unlimited seats & environments

Trial: None · Free tier included · 2 paid tiers ($200–$4000) · Observed 2026-11-09 · Pricing page

Entry price $200/mo, Higher than 95% of peers; “Fraud Prevention & Verification” median is $19/mo.View pricing benchmark

Pages & changes

Tracked since 2015-02-16

Key pages

Weekly snapshots

Changes

  1. Nov 1 · 13d ago

    Homepage headline (H1) changed to “Stop bots and account abuse at scale”Positioning

    Stop bots and account abuse in minutes→Stop bots and account abuse at scale

    At the time: 28K visits/mo12 concurrent moves
  2. Nov 1 · 13d ago

    Removed technology: Alpine.jsFeatures

    Alpine.js→—

    At the time: 28K visits/mo12 concurrent moves
  3. Nov 1 · 13d ago

    Adopted technology: AstroFeatures

    —→Astro

    At the time: 28K visits/mo12 concurrent moves
  4. Nov 1 · 13d ago

    Removed technology: GSAPFeatures

    GSAP→—

    At the time: 28K visits/mo12 concurrent moves
  5. Nov 1 · 13d ago

    Removed technology: Google AdsFeatures

    Google Ads→—

    At the time: 28K visits/mo12 concurrent moves
  6. Nov 1 · 13d ago

    Removed technology: HugoFeatures

    Hugo→—

    At the time: 28K visits/mo12 concurrent moves

Questions & evidence

How much does Castle cost?
Free: Free; Pro: $200/mo; Enterprise: $4,000/mo. Observed 2026-11-09. Check the source for current billing terms, usage limits and taxes.Source
How much website traffic does Castle get?
Vaneform estimates 28K website visits in 2026-10. Visits can include repeat visits; this estimate measures web traffic separately from paying customers or revenue.Source
What is Castle and what platforms does it support?
Castle is catalogued under Fraud Prevention & Verification: Stop bots and account abuse at scale. Supported platforms: CLI / SDK, API.

Related products in this category

Security & Privacy / Fraud Prevention & Verification

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