Dynamic Email Content Platform
Emails that stay accurate after you hit send
Countdowns that keep ticking, prices that stay current, maps that point to their store, offers that fit where they are. All of it decided when the email is opened.
No trial, no time limit, no credit card.
One email, rendered for whoever opens it.
Pick a city or a device to see their version.
Rainy in Cupertino · 68°F
Warm up, 20% off kitchen
Apple · iPhone 17 Pro 256GB
Pickup: Available tomorrow at Cupertino
$999Save $100Was $1,099
Works with the tools you already use
- + more
One image tag drops into any ESP, and into any system that can send an HTML email.
Sent once. Correct at every open.
The email gets opened hours or days after you send it. The sale ended, the price changed, the stock ran out. Alterable renders the image when they open, so it reflects the moment they’re actually looking.
A deadline that’s actually ticking
The countdown shows the real time left for every open. At zero it stops rather than running negative, and you can set an expiry message or image to take its place so a closed offer never advertises itself as open.
Their name, their points, their last order
Names, loyalty balances and purchase history pulled into the artwork itself, one image per subscriber, generated at open. No pre-made variants to manage.
Their city, their store, their weather
Pass the city you already hold in your ESP and the map points to the nearest store, the weather matches their sky, and the offer fits the region. When the mail client lets the open through, location resolves on its own. No segments, no per-city versions.
What you can build
One image tag, endless variations
Each example below is a working recreation of an Alterable image. The highlighted fields are live, change one and watch it re-resolve, exactly as it would on open.
FREE CUSTOMIZATION
JohnFirst nameJMonogramType a name: the engraving, the monogram and the icon all re-resolve.
Their name, on the product itself
Engrave a first name, set the monogram, swap the icon: the artwork is generated for each subscriber rather than picked from a handful of pre-made variants.
- First name
- Monogram
- Engraved icon
REWARDSUNLOCKED
$10
Reward amountCODE
4815162342
Coupon codeEXPIRATION
--
Expiry dateOpen the same campaign as someone else, both images in this example re-resolve together.
POTTERYHOUSE
JANE WHITFIELD
Full nameTHE LOCK REWARDS
VISASignature
Earn 10% back in rewards today
Apply for the Pottery House credit card today to earn rewards at Pottery House, East Elm, Richard Sonoma and more.
LEARN MORE
Every balance and code, unique
Pull the reward amount, coupon code and expiry straight from your loyalty platform, and resolve the same recipient across every image in the send. No CSV exports, no per-segment versions.
- Reward amount
- Coupon code
- Expiry date
- Full name
FREE SHIPPING ON ALL U.S. ORDERS $60+
MARINA
- MEN
- WOMEN
- KIDS
- HOME
- WORLD OF MARINA
- SALE
HURRY JANE!
SELECT 2 DAY SHIPPING BY 1PM ET ON 6/11
FOR GUARANTEED WEEKEND DELIVERY
OR SHOP IN STORES
LEFT
THIS OFFER HAS ENDED
WEEKEND SHIPPING IS NOW CLOSED
SHOP NEW ARRIVALS
OR FIND A STORE NEAR YOU
The clock is real. Open it late enough and the fallback block takes over. No resend needed.
A clock that knows when it’s over
The countdown renders at the moment of open, so the time left is always right, and once the deadline passes it holds at zero, or shows the expiry message or image you set instead of advertising a dead offer.
- Countdown timer
- Expiry placeholder
EAST ELM
89°FLive weatherinPhiladelphiaLive location
It’s patio weather.
Shop the outdoor collection, 20% off
Local map© Mapbox © OpenStreetMapRittenhouse RowNearest showroom
The city above was picked from your browser’s time zone. Switch it and the weather, the offer, the showroom and the map all resolve again.
Their weather, their nearest store
Location resolves at open-time, so one image merchandises against the weather where they actually are and points them at the showroom they can actually reach. No segments, no per-city versions.
- Live weather
- Live location
- Nearest showroom
- Local map
JaneFirst name, your order is on its way!
Save this email, reopen it for tracking updates.
BY CARRIERIN
TRANSITOUT FOR
DELIVERYDELIVERED
Your order tracking number is:
3141592653589793Tracking number
Nothing is resent: the same image re-renders at each open. Sped up here so you can watch it.
Status that updates on every open
Order tracking, stock levels, scores, prices, anything you can expose to an API renders into the image each time it is opened, long after the campaign was sent.
- Live tracking
- Tracking number
- First name
Rather see it in your own inbox?
Use Cases
Built for the moments that matter
Whatever the campaign, the content stays live.
Flash sales, launches, and seasonal peaks
A live countdown in every open turns “ends soon” into a visible deadline, from a weekend flash sale to Black Friday.
Winback and abandoned carts
Show current products, prices, and stock at open time, not send time.
Loyalty and milestones
Render each reader’s points balance, tier, or birthday offer right into the hero image.
Store visits and local events
A map to the nearest location, rendered from where the reader opens the email.
3-Step Setup
Deploy real-time content that stays relevant long after you hit send
Define logic
Set your campaign rules in seconds. Choose between fixed-date promotions or evergreen flows, and configure fallback triggers for location, weather, or missing data.
Design content
Use the visual builder to layer dynamic data, like names, maps, or survey questions, onto your brand’s assets. Preview live variations instantly to ensure a perfect look for every recipient.
Embed snippet
Copy your platform-agnostic code snippet into your ESP (Klaviyo, Mailchimp, etc.). Our engine renders the content at open-time.
Frequently asked questions
Will Alterable hurt my deliverability?
No. Alterable content is delivered as standard images, the same kind your ESP already sends. There’s no JavaScript in the email, and nothing changes about your sending domain or authentication (SPF, DKIM, DMARC stay exactly as they are). Personalization happens on our image servers at open time.
What if a subscriber blocks images?
They see what they’d see with any image email: your alt text, and the rest of your email renders normally. We recommend meaningful alt text and keeping key details (dates, prices) in text alongside the image. Alterable enhances the email. It doesn’t replace its foundation.
How does location personalization work?
It depends on the mail client. When a client fetches the image directly, location is resolved approximately from that request at the moment of open, and nothing needs setting up. Most mail clients, though, load images through their own proxy servers, which hides where the reader actually is. For those, you pass the location you already hold in your ESP (city, region or country) as merge tags on the image URL. Either way there is no tracking script and nothing for the subscriber to install.
What happens when a countdown hits zero?
You decide in advance. Left alone, the timer stops at zero rather than counting into negative numbers, so a closed offer never advertises itself as still open. Or set an expiry placeholder, either a line of text or an image of your own, and that takes the timer’s place on every open after the deadline, including in emails already sitting in someone’s inbox.
Do I need to switch ESPs or change my workflow?
No. Paste one image tag into your existing templates in Klaviyo, Mailchimp, or any ESP. Define the rules in our visual builder, embed the snippet, and that’s the whole integration.
Is the free plan really free?
Yes. The Engage plan is free with no credit card, and includes 10,000 impressions a month across every content type: timers, images, products, maps, surveys and scratchers. An impression only counts when someone opens the email and the content actually loads, so you never pay for emails nobody opened. Full limits are on the pricing page.
How is this different from merge tags or liquid personalization?
Merge tags resolve once, when you hit send. Alterable resolves at every open, so prices, countdowns, and location reflect the moment the subscriber is actually looking, even days later.
Still have questions? Contact us →
Get started
Make the email you already sent stay accurate
Increase message engagement without changing your existing marketing software.
No trial, no time limit, no credit card.