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Lean CTAs

Plugin WordPress lean para CTAs dinámicos según categoría. Convierte tráfico en leads con zero friction.

by Cristian Tala · github.com/ctala/lean-ctas · website

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Install

No release zip yet. The repository archive installs, but the folder name will carry the branch suffix and updates will not flow:

wp plugin install https://github.com/ctala/lean-ctas/archive/refs/heads/main.zip
Readme github.com/ctala/lean-ctas ↗

Lightweight WordPress plugin that dynamically injects Call-to-Action blocks into your post content based on post type, taxonomy, or category. Zero dependencies, works with any theme.

Features

  • Smart matching — Most specific CTA wins (type+term → term → type → global)
  • Per-category colors — Different accent color per CTA
  • Dark mode — Auto-detects dark themes, no configuration needed
  • Position control — Inline (after paragraph N), end of post, or both
  • Any post type — Posts, pages, custom post types
  • Any taxonomy — Categories, tags, custom taxonomies
  • Shortcode — [lean_cta] for manual placement
  • Zero dependencies — Pure PHP, no build tools, no external assets
  • Opt-in form mode — Email capture form integrated with Listmonk (double opt-in, no API credentials needed)

Installation

Note: This plugin is not yet available on wordpress.org. Install manually using one of the methods below.

Option 1 — Direct Download (recommended)

  1. Download the latest zip: lean-ctas.zip
  2. In your WordPress admin, go to Plugins → Add New → Upload Plugin
  3. Choose the downloaded lean-ctas.zip and click Install Now
  4. Activate the plugin

Option 2 — From GitHub

  1. Go to Releases and download the latest .zip
  2. Upload via Plugins → Add New → Upload Plugin in wp-admin

Option 3 — Manual (FTP/SSH)

  1. Download and unzip lean-ctas.zip
  2. Upload the lean-ctas/ folder to /wp-content/plugins/
  3. Activate in Plugins → Installed Plugins

Quick Start

  1. Go to Settings → Lean CTAs
  2. Check Enable CTAs and select which post types should show CTAs
  3. Set your default accent color
  4. Click + Add CTA — fill in title, text, button label, and URL
  5. Choose position: inline, end of post, or both
  6. Save — done

How Matching Works

Priority Condition Example
1 (highest) Post type + specific term Posts in "Technology" category
2 Specific term (any type) Any content tagged "startup"
3 Post type (any term) All posts
4 (lowest) Global fallback Everything else

One CTA per post — the best match wins.

Color System

Set a default accent color in settings. Each CTA can optionally override it.

Default color: #2563EB (blue)
├── Technology CTA → #2196F3 (override)
├── Startups CTA  → #FF6B35 (override)
├── Business CTA  → #4CAF50 (override)
└── Fallback CTA  → uses default #2563EB

The accent color controls the left border and button background.

Dark Mode

Works automatically. No configuration, no CSS overrides, no code changes.

The plugin detects dark themes through:

  1. prefers-color-scheme: dark (OS-level)
  2. .dark class on <html> or <body>
  3. data-theme="dark" or data-color-scheme="dark" attributes
  4. Background luminosity — measures <body> background color and adapts if it's dark
Property Light Theme Dark Theme
Background rgba(0,0,0,.04) rgba(255,255,255,.06)
Title #111 rgba(255,255,255,.92)
Text #444 rgba(255,255,255,.7)
Button Accent color, white text Same

Custom CSS

Override with CSS custom properties:

.lean-cta-block {
    --lean-accent: #FF6B35;
    --lean-bg: rgba(0,0,0,.04);
    --lean-title: #111;
    --lean-text: #444;
}

Shortcode

[lean_cta]                        <!-- Best match for current post -->
[lean_cta post_type="glosario"]   <!-- Force post type -->
[lean_cta category="131"]         <!-- Force category -->

Opt-in Form Mode (v2.4.0+)

A CTA can render an email capture form connected to Listmonk instead of a button link.

How it works

  1. Set Button type to "Opt-in form (Listmonk)" in the CTA row.
  2. Enter the Listmonk List UUID (Settings → Lean CTAs → CTA row → Listmonk List UUID). Find it in Listmonk → Lists → Edit. Multiple lists (v2.4.1+): comma-separate UUIDs (uuid1,uuid2) — the subscriber is added to all of them.
  3. Set Listmonk URL in the global settings (e.g. https://listmonk.nyx.cristiantala.com). No user/token needed.
  4. Optionally customize the Success message.

Capture webhook routing (v2.5.0+)

Optionally set Capture webhook URL (n8n) in global settings. When set, submissions POST there as JSON (email, list_uuids, page_url, GA client_id/session_id parsed server-side from the visitor's cookies) so an n8n workflow can handle Listmonk + a server-side GA4 generate_lead event (Measurement Protocol, with real session attribution) + any extra plumbing (tagging, CRM). Automatic fallback: if the webhook fails (non-2xx / 4s timeout) the plugin falls back to the direct Listmonk path — a capture is never lost. The webhook URL is server-side only; the browser never sees it.

Cross-sell checkbox — secondary list (v2.6.0+)

An opt-in CTA can offer a second list via checkbox: set Secondary list UUID + Secondary checkbox label in the CTA row. The checkbox is always unchecked by default — pre-ticked consent is invalid under GDPR (Planet49) and silently adding users to higher-frequency lists hurts deliverability. Works on both paths (no-JS and JS); the secondary UUID joins the allowlist. Take-rate is measurable via the list_uuids param in the capture webhook / GA4 event.

Placement anywhere (v2.4.1+)

A CTA with Position: Manual is never auto-injected; render it wherever you want with [lean_cta optin="1"] (e.g. inside a sitewide popup in wp_footer). On successful JS subscription the plugin dispatches a leanctas:subscribed DOM event so your popup can auto-close.

Double opt-in

The plugin sends to Listmonk's public endpoint (/api/public/subscription). If the target list is configured for double opt-in in Listmonk, Listmonk sends the confirmation email automatically. This is intentional — do not change to /api/subscribers.

No-JS fallback

The form works with <form method="post"> and a full page reload if JavaScript is disabled or unavailable. With JS, a ~1.3 KB vanilla fetch script intercepts the submit and swaps the form for the success message without reload.

Caveat if Cloudflare Turnstile (below) is configured: Turnstile itself needs JavaScript to solve the challenge, so a visitor with JS fully disabled cannot subscribe while it's active — that's inherent to any browser captcha, not specific to Turnstile. Leave the Turnstile keys blank to keep the form fully no-JS friendly.

Anti-spam: Cloudflare Turnstile challenge (v2.7.0+)

Honeypot + UUID allowlist + IP rate limit stop a lazy bot but not a distributed one — many source IPs, few requests each, honeypot field never touched. That's what hit ecosistemastartup.com on 12–14 ago 2026 (~331 third-party addresses injected, each also firing a GA4 generate_lead event through the capture webhook).

  1. Cloudflare dashboard → Turnstile → Add site → get a Site Key and Secret Key (free, no request cap).
  2. Settings → Lean CTAs → paste both into Turnstile Site Key / Turnstile Secret Key.
  3. That's it — no code change. Both keys are required to activate; leave either blank and the plugin behaves exactly as it did in 2.6.0 (no captcha shown, no challenges.cloudflare.com request).

Enforced identically on both submission paths (REST /lean-ctas/v1/subscribe and the no-JS admin_post fallback) — a bot switching from one path to the other doesn't help it. Fails closed: once configured, a missing or invalid token is rejected, not silently accepted. See includes/captcha.php for why Turnstile was chosen over reCAPTCHA.

Smoke test (staging)

  1. Install and activate plugin on a staging WP instance.
  2. Settings → Lean CTAs: set Listmonk URL to your staging Listmonk instance.
  3. Add a CTA: Button type = Opt-in form, List UUID = <your list uuid>, any title/text.
  4. View a post — the form renders server-side (check "View Source", no JS required).
  5. Disable JS in DevTools → submit form → page redirects back with ?lc_done=ok → success message visible.
  6. Re-enable JS → submit form → success message swaps in without reload.
  7. Check Listmonk → Subscribers → the email appears (status "unconfirmed" if double opt-in is on, pending confirmation email).
  8. Confirm the confirmation email → subscriber becomes active.
  9. Turnstile — legit path: set both Turnstile keys (use Cloudflare's always-passes test keys on staging: site key 1x00000000000000000000AA, secret key 1x0000000000000000000000000000000AA). Submit the form → succeeds exactly as before (widget is invisible with these test keys).
  10. Turnstile — rejection, REST path: curl -s -X POST '<site>/wp-json/lean-ctas/v1/subscribe' -H 'Content-Type: application/json' -d '{"email":"test@example.com","list_uuid":"<configured uuid>"}' (no cf_turnstile_response) → expect HTTP 400, {"code":"captcha_failed",...}. Confirm nothing was created in Listmonk.
  11. Turnstile — rejection, no-JS path: curl -s -i -X POST '<site>/wp-admin/admin-post.php' -d 'action=lc_subscribe&lc_email=test@example.com&lc_list=<configured uuid>' (no captcha field) → expect a 302 redirect to ?lc_done=err. Confirm nothing was created in Listmonk.
  12. Set only one of the two keys → confirm the form renders and submits with no captcha shown (fail-open on "not configured").

For Daily Shot (ecosistemastartup.com):

  • Listmonk URL: https://listmonk.nyx.cristiantala.com
  • List UUID: 2c6f425d-96d9-47b6-bc7b-761dd04e185f

Requirements

  • WordPress 6.4+
  • PHP 8.1+

License

GPL-2.0-or-later

Made with love from Chile by cristiantala.com