Swapstack is the self-serve newsletter marketing platform that lets you sponsor countless independent newsletters (like Flipboard) without the added stress of emails and logistics.

Choose between a CPA or PPC model and work with up to 1,000 publishers at once! Plus, enjoy a streamlined sponsorship process that eliminates back-and-forth with the publisher, making it a win/win for both sides and getting your sponsorships out in the world with minimal turnaround time.

For brands, Swapstack makes it easy to create custom sponsorships and connect with publishers via a simple chat box. And for publishers, Swapstack lets you monetize your work and connect with sponsors, whether you're looking for immediate opportunities via the affiliate network, the PPC tool or more bespoke arrangements, Swapstack facilitates it all.

Sponsorships can either be one-off, recurring or always on depending on the approach you take. For maximum exposure, a combination of CPA and PPC tools are recommended!

With 60 million audiences and 1,000+ publishers, Swapstack's innovative ad-tech is a win-win for everyone!

Pricing: Swapstack operates on a paid-first policy so while it's free to browse, any sponsorships that happen will incur a small %-based fee of the final spend.

Alterable adds real-time, open-time content to email campaigns, no coding, no ESP integration, no resends. Every asset is a single image URL that renders fresh the moment a subscriber opens the message, not the moment you hit send.

Countdown timers count down live in the inbox. Choose a fixed deadline for your whole list, an evergreen timer that starts when each subscriber opens, or a per-recipient deadline pulled from a merge tag. Ten visual styles, full color and font control.

Dynamic images show a different visual to every recipient based on location, device, language, weather, temperature, or time of day. A no-code rules builder stacks conditions and maps each combination to its own image variation.

Dynamic products pull live price, stock, and availability at the moment an email opens. Sold-out items hide automatically; low-stock items get a scarcity badge. Sync via CSV, REST API, or a Shopify/BigCommerce connection.

Local maps show each subscriber their nearest store, rendered around their location at open-time. Four map styles, custom markers, and deep links to native navigation apps.

Surveys put a one-click star, number, or emoji rating directly in the email body, no landing page, no login. Results populate a live dashboard as votes arrive.

Scratchers turn a discount into a game: a scratch-card reveal linking to a hosted prize page, with customizable cover art, reveal animations, and (on Pro) multiple weighted prizes.

Every asset works the same way: build it in Alterable's editor, copy one image tag, paste it into any ESP. Because it's just an image, it works in every major email client, no JavaScript or AMP required. Integrates with 50+ platforms including Klaviyo, Mailchimp, HubSpot, Brevo, ActiveCampaign, Constant Contact, GetResponse, AWeber, and Kit.

Also included: 22-language localization, timezone support, real-time analytics, CDN delivery, and REST API access. Free to start, no credit card required.