Everything around
your Substack, in one studio.
Branded subscribe forms, modern popups, a live newsfeed of your Substack posts, AI drafts from articles you saved — and one-click publish or schedule directly to Substack. No second bill, no second login, no CDN lock-in. You own the embed code; it lives on your site, not ours.
7-day refund · Cancel anytime · Embeds work without connecting Substack
The problem
You shouldn't need five tools and three bills
to send a newsletter.
Most writers cobble together a subscribe form, a popup tool, another writing app, a research tab graveyard, and Substack itself — paying for each one, maintaining each one, losing subscribers between each one. Quillo collapses that stack.
Multiple bills, fragmented stack
Form tool, popup tool, AI writer, scheduler — each with its own subscription. Quillo is one studio at one price.
Your site doesn't capture readers
Without a branded subscribe form, every visitor is a missed subscriber — and a missed future income stream.
Great reads die in your tabs
You save articles you mean to share. Quillo turns them into a digest with AI — your weekly issue, almost written for you.
Embed templates
Forms that match your brand —
not Substack's default.
Sixteen+ ready-to-style templates. Every color, font, radius, and copy field is editable. Paste one snippet on any site, anywhere.
Plus popup, slide-in, exit-intent & lead-magnet variants — fully themable.
Modern popup designs
Convert visitors without
the cheap pop-up energy.
Seven popup formats, each one designed like editorial — not like a 2012 ad. Trigger by time, scroll, or exit-intent. Throttle by session, day, or week. Attach a lead-magnet PDF to give visitors a reason to subscribe.
Editorial Morning
Warm serif lockup with a coffee-table photo.
Studio Split
Photo left, form right — magazine style.
Coastal Hero
Full-bleed photo backdrop, white text overlay.
Don't leave — gift inside
Exit-intent rescue with a reward image.
Aurora Glass
Soft gradient art with glass-card form.
Magazine Banner
Sticky bottom strip with a small thumbnail.
Reader's Corner
Slide-in card with a books photo.
Free Chapter PDF
Offer a free book chapter as a PDF download.
Dark Slide-in Form
Compact dark card in the corner, no image.
Bold Top Banner
Plain attention-grabbing banner, no image.
Cheat Sheet PDF
Slide-in offering a one-page PDF cheat sheet.
Every popup
Themable to the pixel.
Inherits your embed theme — fonts, colors, radius, copy. Custom CSS escape hatch when you need it.
Substack Newsfeed
Your Substack posts,
rendered on your own site.
Embed a branded feed of your own posts — or feature a curated mix of popular reads — anywhere on your site. Five layouts, eleven theme presets, full custom colors, and per-field visibility toggles so the feed matches your brand exactly. Every card links back to Substack to convert browsers into subscribers.
Three builders, one studio
Edit on the left.
See it live on the right.
Every builder ships with a real-time preview — what you ship is what you saw. The embed code stays clean, semantic, and lives on your site (no hidden iframes, no CDN lock-in).
Form Builder
Pick a template, theme it, drop the snippet. Live preview as you tweak. Posts submissions directly to Substack — no middleman list.
- Sixteen+ templates
- Live preview
- Per-corner radius
- Custom CSS hook
- Lead-magnet PDF reward
- Clean HTML output
Popup Builder
Eleven popup formats, every trigger you actually need. Watch your popup render in a live preview while you set throttling.
- Time / scroll / exit triggers
- Frequency caps
- Lead-magnet downloads
- Slide-in & banner formats
- Live preview
- Inherits embed theme
Newsfeed Builder
Pick your Substack URL, choose layout + theme, hit refresh to snapshot the latest posts. Preview renders the exact card you'll ship.
- Five layouts
- Eleven theme presets
- Curate or auto-feed
- Refresh-on-demand
- Paid post badges
- Live preview
Draft with the model
you already pay for.
Plug in your own OpenAI, Anthropic, Google, Mistral, DeepSeek, or OpenRouter key. We never resell tokens, never mark up usage, and your key stays encrypted server-side. Switch providers per draft — the composer adapts to whichever model you point it at.
OpenAI
Bring your keyBest all-rounder for nuanced prose & long-form structure.
- GPT-5 / 5.1
- GPT-4.1 / 4o
- o4-mini reasoning
Anthropic
Bring your keyMost natural, least 'AI-voiced' drafts — great for essays.
- Claude Sonnet 4.5
- Claude Opus 4
- Claude Haiku 4
Google Gemini
Bring your keyHuge context windows — paste whole research piles in.
- Gemini 2.5 Pro
- Gemini 2.5 Flash
- Gemini 2.0 Flash
Mistral
Bring your keyEU-hosted, fast, strong on structured writing.
- Mistral Large
- Mistral Medium
- Codestral
DeepSeek
Bring your keyCheapest per-token reasoning — great for high-volume drafts.
- DeepSeek V3
- DeepSeek R1 reasoning
OpenRouter
One key · 200+ modelsOne key, every frontier model. Switch without re-pasting.
- Llama 3.3
- Qwen 2.5
- Any model on OpenRouter
Your key, your bill
No Quillo markup. You pay your provider directly at their rates. Cancel us; your AI workflow doesn't break.
Voice that's actually yours
Paste a past Substack post once. Every draft adopts your cadence, vocabulary, and punctuation tics.
Encrypted & private
Keys are encrypted at rest, scoped to your account, and used only on requests you trigger. No background training, ever.
What's inside
Every surface a writer needs.
Embed Studio
Six layouts, full theme control, per-corner radius, custom CSS escape hatch. Drop one script tag — works on any site.
Popups & lead magnets
Timed modals, slide-ins, bottom banners, exit-intent rescues. Attach a free download as a reward for subscribing.
Live Substack newsfeed
A branded card feed of your latest Substack posts on your own site. Auto-syncs. Drives readers back to subscribe.
AI Composer
Generate subject lines and full markdown drafts from a topic, a few links, or articles you've saved. No API key needed.
Chrome extension — clip + keep Substack alive
One-click save any article to your Library with title, excerpt, cover image and author. Plus a background job that auto-refreshes your Substack session so Quillo never asks you to re-log in.
Push as Substack draft
One click sends your draft to Substack. You always review and hit publish there. No surprises, no auto-publish.
Publish now
Skip the round-trip. Hit publish from Quillo and your draft goes live on Substack instantly.
Schedule for later
Pick a date and time. Substack's scheduler sends the issue — and you can unschedule anytime.
WordPress plugin
One-click connect, a 'Send to Quillo' button on every post, and shortcodes to drop your subscribe form or Substack newsfeed on any page. Auto-updates from the WP dashboard.
Built for
Writers, curators,
site owners who don't write — yet.
The weekly digester
You save smart things all week. Quillo's library + AI turns the pile into a polished digest — you edit, push, done.
The new Substack creator
Want to monetize what you know? Spin up Substack, drop a Quillo subscribe form on your site, and you're collecting paid subscribers.
The site owner without a newsletter
If your traffic doesn't subscribe to anything, you're leaving compounding readership — and revenue — on the floor. A 30-second embed fixes it.
From blank page to
ready-to-publish draft.
A workflow so tight it feels like cheating. Built for writers who refuse to copy-paste.
Drop your URL
Quillo wires the subscribe endpoint. No Substack login needed for embeds.
Style & paste
Pick a template, dial in your colors. Copy the snippet. Live on your site.
Save reads + draft
Save links with the extension. Ask AI to draft your weekly digest.
Publish or schedule
Push as draft, publish instantly, or schedule for the morning send.
Trust & safety
Your Substack login never leaves your control.
Quillo connects to Substack with an encrypted session token — stored server-side, end-to-end encrypted, and used only when you explicitly push, publish, or schedule. Disconnect anytime and the token is purged.
- End-to-end encrypted Substack session tokens
- Row-level security on every database table
- Every push lands as a Substack draft by default — you decide what goes live
- Subscribe forms post directly to Substack — no middleman list, no double opt-in surprises
- Your embed code is plain HTML on your site — no CDN lock-in, remove anytime
- Lead-magnet downloads served over signed URLs — only delivered after confirmed subscribe
- Audit log of every publish, schedule, and draft action
Quillo Studio
The full editor in your browser. Best for creators publishing across multiple sites and platforms.
Try the studioQuillo for WordPress
Send any WordPress post to your Quillo Library in one click, and drop subscribe forms or your Substack newsfeed onto any page with a shortcode.
Get the pluginQuillo Clipper
Save articles from any site to your Library with one click — and keep your Substack session fresh in the background so publishing never breaks.
In the studioTwo jobs.
Zero friction.
The Quillo extension lives in your toolbar and does exactly two things — nothing more, nothing tracked. Install it once, paste your token, forget it exists.
- Manifest V3 — no remote code, no analytics, no page reading
- Works on any site, in any Chromium browser
- One token from Quillo Settings, stored in browser local storage
Save current page to Library
Click the Quillo icon → 'Save current page to Library'. We grab the URL, the Open Graph title, excerpt, cover image, site name and author — then drop it into your Library, ready for the AI composer.
Keep your Substack session alive
A daily background alarm reads your substack.sid cookie (only on substack.com) and refreshes it with Quillo. So when you hit Publish or Schedule, your session never times out mid-send.
Your WordPress.
Plugged into Quillo.
A tiny PHP plugin that connects your WP site to Quillo in one click. Send posts to your Library for the AI composer, and drop Quillo embeds into any page with a shortcode.
- Connects via your Quillo token — no FTP, no API keys to copy
- Self-hosted auto-updates from the WP dashboard
- Works on posts and pages, WP 5.6+, PHP 7.4+
Send post to Quillo
A 'Quillo' meta box appears on every post and page editor. One click sends the title, excerpt, permalink, featured image and author to your Quillo Library — ready for the AI composer.
Subscribe shortcode
Drop [quillo_subscribe id="…"] into any post, page or widget area. Your branded Quillo subscribe form renders as a responsive iframe — no script tag required.
Newsfeed shortcode
Use [quillo_newsfeed id="…"] to embed your live Substack newsfeed anywhere on your WordPress site — same look and feel as the Quillo studio preview.
Auto-update channel ships new versions straight to your WP dashboard
FAQ · Substack timing & data
What to expect when you connect Substack.
Where exactly does ‘publish’ go?
+
Always to Substack. Quillo doesn't host posts — we push to your Substack via your connected account. Drafts land in your Substack drafts, scheduled posts use Substack's own scheduler, and instant publish goes live on your Substack publication.
Is scheduling really running on Substack?
+
Yes. When you pick a date/time, we hand the schedule to Substack — the email is sent from Substack's infrastructure, with your sender reputation, at the time you chose. You can unschedule from either Quillo or directly inside Substack.
How fast do new subscribers appear in my Substack list?
+
Subscribe submissions hit Substack's API the moment a reader confirms. Substack's own list/dashboard typically reflects new subscribers within a few minutes, but during peak hours it can take 5–30 minutes for the count to fully reconcile on their side. The subscriber is still queued — just give Substack a beat.
The newsfeed shows old posts — why?
+
The newsfeed renders from a snapshot you control. Open the Newsfeed Builder and hit ‘Refresh posts’ to pull the latest from your Substack. This is by design: a snapshot means zero live API calls on every visitor (faster pages, no rate-limit surprises).
If I publish from Quillo, when does the email actually send?
+
‘Publish now’ flips your post live on Substack immediately. Substack then queues the email blast — which, depending on list size, can take a few minutes to begin sending. This is identical to publishing inside Substack directly.
Do I have to connect Substack to use Quillo?
+
No. The embed studio, popups, lead magnets, and newsfeed all work without ever connecting Substack — your subscribe forms still post directly to your publication via the public subscribe endpoint. Connect Substack only when you want AI-drafted publishing and scheduling.
If I uninstall Quillo, do my embeds break?
+
No. Forms keep posting to Substack's public subscribe endpoint, which doesn't go through us. Newsfeed and popup widgets do call back to our renderer — if you ever leave, just remove the snippet. Your audience and your Substack are unaffected.
Where are my Substack credentials stored?
+
Your Substack session token is encrypted server-side and only decrypted in-memory when you explicitly trigger a publish, schedule, or draft push. Disconnect from Settings and the token is purged.
Pricing
One plan.
Three ways to pay.
Full Quillo — branded embeds, AI drafts (BYO key), Substack push, content library, Chrome extension, WordPress plugin.
Monthly
Try it, cancel anytime.
Then $5 / month · Cancel anytime
Yearly
Save ~18%. Most popular.
Then $49 / year · Cancel anytime
Lifetime
Pay once. Yours forever.
Then $149 one-time · Cancel anytime
Secure checkout via Freemius · Cancel anytime · 7-day refund