Powerline
Renders HTML emails in real mail clients as pixel screenshots and checks domain SPF, DKIM, DMARC and blacklists via API.
≈ 106visits/mo
Little sign of use · estimate, read 2026-10-12
- For
- Developers and teams testing email rendering and deliverability, using the web tools or an API
- Price
- Price not read
- App
- iPhone & iPad · 4.1★ from 3k ratingscurrent version 2026-08-26 ↗
- Activity
- Actively maintainedrelease 7 weeks ago · site updated 12 days ago
- Company
- Domain since 2020domain registered
- Runs as
- API
- Render HTML emails across Gmail, Outlook and Yahoo Mail
- Check a domain's SPF, DKIM and DMARC records
- Read email headers to see delivery path verdicts
- Domain since2020domain registered
- MCP serverai.powerline/email-toolsverified in the MCP registry
- Stateanswers, 5 toolschecked 2026-10-13
- Address to connectpowerline.ai/mcp
Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.
Figure and bar: visits/mo, estimate · year: online since
- #1
GLOCKSOFTMCP · sign-in
Tests where your emails land in Gmail, Outlook and Yahoo inboxes versus spam folders, and checks SPF, DKIM, DMARC and blocklist status.
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Generates brandable domain name ideas and checks availability across multiple TLDs in real time.
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ScreenshotInkMCP · sign-in
Captures full-page screenshots, PDFs and HTML-to-image renders of any URL via REST or MCP, with pixel-diff change monitoring.
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SocialClaw
Schedules and publishes posts across 11 social networks via API, CLI, or AI agent integration.
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mailfixtureMCP · sign-in
Receives test emails into disposable inboxes and returns parsed one-time codes, links and authentication verdicts to CI tests.
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Snapshot Site
Captures full-page screenshots with a real browser, compares two page states as a diff image, and runs quality analysis on web pages via API.
5Active—
What is Powerline?
Renders HTML emails in real mail clients as pixel screenshots and checks domain SPF, DKIM, DMARC and blacklists via API. It is listed in the Atlas under Productivity.
Who is Powerline for?
Developers and teams testing email rendering and deliverability, using the web tools or an API
Do people use Powerline?
Little sign of use: ≈ 106 visits/mo · estimate, 2026-10.
Is Powerline still maintained?
Actively maintained: release 7 weeks ago · site updated 12 days ago.
Does Powerline have an iPhone app?
Yes: “powerline.io” on the App Store, rated 4.1 from 3k ratings; current version released 2026-08-26.
What are alternatives to Powerline?
In Productivity, by use: GLOCKSOFT, domhaul, ScreenshotInk, SocialClaw, mailfixture, Snapshot Site.
Not quite it? Describe the job
betaFive tools from the Atlas that fit it, each judged against what you wrote.
How we read a tool
No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.
- Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
- Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
- Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
- The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.
How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.