API checks plus certificates and uptime

The Assertible alternative for uptime as well as assertions

Assertible runs automated tests against APIs on a schedule and after deployments, with assertions on status, JSON body and headers. It is testing that happens continuously rather than monitoring that happens to test.

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From $5 a month · No check quotas · Set up in under a minute

On this page
  1. Quick verdict
  2. Why people switch
  3. Assertible vs MonitoringDaddy
  4. What Assertible does better
  5. What you get
  6. Switch or stay
  7. Pricing
  8. Migration, step by step
  9. How we compared
  10. FAQ

Is MonitoringDaddy a real Assertible alternative?

For teams who want continuous availability monitoring with simple content checks, yes, plus certificates, domains and page changes. Assertible is better if you need real assertions on JSON responses or tests triggered by deployments.

The trigger

Why people look for a Assertible alternative

Testing versus monitoring

Assertible is closer to automated testing on a schedule. If what you need is "is it up", that is a lot of assertion machinery.

No certificate or domain expiry

Two outages that hit APIs exactly as hard as web pages.

Deployment integration may be unused

Post-deploy test triggers are valuable to teams with CI and irrelevant to those without.

Side by side

Assertible vs MonitoringDaddy

Green marks the stronger option on that row. Third-party pricing and limits change without notice — treat the Assertible column as a starting point and confirm current figures on their site before you decide.

Feature Assertible MonitoringDaddy
API assertions on JSON body Yes — deep and structured Status, keyword conditions, custom headers, methods and basic auth
Post-deployment test triggers Yes No
Uptime monitoring Yes Yes, with incidents on every plan
SSL and domain expiry No Yes — attached to any monitor, no extra allowance
Website change detection No Yes, with word-level diffs and images
Cron / heartbeat monitoring No Yes — up to 100 on Pro
Hosted status page Limited Yes, included on every plan
Entry paid price From ~$25/mo — verify on their site $5/mo for 25 monitors, 25 watches, 25 heartbeats
Fair comparison

What Assertible does better

Every comparison page on the internet claims the author's product wins on everything. Here is where it does not.

  • Structured assertions on JSON responses that we cannot match.
  • Tests triggered after deployment, tying monitoring to your release process.
  • A clear testing model for teams who think in test suites.

If any of those are load-bearing for your team, staying put is the correct decision and this page has done its job. Monitoring you actually trust beats monitoring that is marginally cheaper.

The product

What you actually get with MonitoringDaddy

Six monitor types and one dashboard. No add-on products, no separate SKUs for the features you assumed were included.

Uptime monitoring

HTTP checks from external infrastructure, as often as every 60 seconds, with downtime and recovery alerts. See the uptime setup guide.

SSL certificate expiry

A dedicated monitor type with configurable advance warnings, so a certificate never lapses because nobody owned the renewal. See SSL expiry monitoring.

Domain expiry

Registration expiry tracked as its own monitor, warning you months ahead. The outage nobody has a runbook for. See domain expiration monitoring.

Content change detection

Alert when a phrase appears or disappears on a page — defacement, stock changes, silent policy edits. See website change detection.

Price monitoring

Watch a competitor or supplier price string and get told the moment it moves. See the price monitoring guide.

Hosted status pages

Public status pages included on every plan, hosted independently of your infrastructure so they stay up when you do not. See hosted status pages.

Alerts from any of these can be routed to email, Slack, Microsoft Teams, Discord, Telegram, Flock or a generic webhook, and a single monitor can carry several channels at once. Everything is available through the REST API on paid plans, so monitors can be created and torn down programmatically rather than clicked through a form.

The decision

Who should switch — and who should stay

Switch if…

  • You need certificate, domain, cron or page-change monitoring.
  • Simple status and keyword checks cover your endpoints.
  • You want incidents and a status page rather than test results.

Stay on Assertible if…

  • You assert on JSON structure or response contents.
  • Post-deploy verification is part of your pipeline.
Pricing

What MonitoringDaddy costs

Flat monthly tiers. No per-seat charges, no credit top-ups, no usage meters — the number below is the whole bill. There is no free plan; every tier can be cancelled at any time.

PlanMonitorsFastest intervalAlert channelsAPIPrice
Starter25Every 5 minutesEmail + webhook & chatYes$5/mo
Basic10Every 10 minutesEmail + webhook & chatYes$8/mo
Growth50Every 5 minutesEmail + webhook & chatYes$19/mo
Pro100Every 60 secondsEmail + webhook & chatYes$34/mo

Annual billing is cheaper on every paid tier. The pricing page is the authoritative list.

Migration, step by step

Moving from Assertible without a gap in coverage

There is no automated importer — monitors are re-created by hand, or scripted through the API. Budget about a minute per monitor. These are the real screens.

1. List what you actually monitor

Export or write down every active check in Assertible: the URL, how often it runs, what counts as a failure and who gets alerted. Most teams find checks nobody needs any more — this is the moment to drop them.

2. Re-create the important ones first

Open Monitors → API → New API monitor. Under Request, set the method, headers and authentication you used in Assertible, and use a text check on the response body. There is no request-body field, so point it at a GET health endpoint.

API monitor form with text check, method, headers and authenticationMethod, headers, authentication and a text check.

Then click + under Alert channels and add the same destinations your team watches today — email, Slack, Microsoft Teams, Discord, Flock, Telegram or a webhook.

Alert channel options: Email, Webhook, Slack, Microsoft Teams, Discord, Flock and TelegramAlert channels available on every monitor.

3. Run both tools in parallel for a week

The overview charts response time and lists each check's status code.

API monitor overview with response time chart and recent checksResponse times and status codes per check.

4. Point your status page and cancel

Move any public status page across, confirm a full week of clean overlap, then cancel Assertible. Keep the export from step 1 — it is the easiest way to prove nothing was left behind.

Start monitoring Read the setup guide
Methodology

How this comparison was put together

This page is written by the team that builds MonitoringDaddy, so treat it as an informed argument rather than a neutral audit. What we can promise is that the claims about our own product are checked against what the software actually does, and the rows where Assertible is stronger are marked as such rather than quietly omitted.

Details about Assertible come from their public pricing and documentation at the time of writing. Monitoring vendors change plan limits and prices frequently and without announcement, so every third-party figure here carries a "verify on their site" caveat and you should take it seriously before making a decision on cost.

One thing worth stating plainly, because most comparison pages fudge it: MonitoringDaddy checks run from our own infrastructure, which is external to yours, but from a single origin rather than a global probe network. That is enough to catch outages and content changes independently of your stack. It is not enough to tell you a site is down in Frankfurt but up in Ohio. If regional verification is a hard requirement, a larger platform will serve you better and we would rather you knew that now.

Found something out of date or wrong? Tell us and we will correct it.

See it

What an alert actually looks like

Every recorded change is compared word by word and kept with a before-and-after image. This is the real output, shown with worked example data.

competitor.com/pricing Watching: Pricing table
− Pro plan — $49 per month
+ Pro plan — $39 per month
+ Save 20% with annual billing

Price fell from $49 to $39, and an annual discount was added.

2 words added · 1 removed · 4.1% of the watched region

retailer.com/product/… Watching: Availability
− Out of stock
+ In stock — ships tomorrow
+ Add to basket

The item is available again and the basket button returned.

6 words added · 3 removed · 12.5% of the watched region

supplier.com/subprocessors Watching: Subprocessor list
~ Data is processed in the EUthe EU and the United States
+ Added: Northwind Analytics Inc. (United States)

A new subprocessor was added in another jurisdiction.

9 words added · 2 removed · 1.8% of the watched region

Worked example — not live data. Start monitoring
Alerts

Where we can reach you

The free plan sends to one email address. Every paid plan adds the chat and webhook channels below, with 2 to 10 destinations depending on the plan. However many alerts you receive, the price does not change — nothing here is metered or charged per alert.

Email Before and after images inline
Browser push On a phone or desktop lock screen
RSS feed Every recorded change, as a feed
SlackPaid Through an incoming webhook
Microsoft TeamsPaid Through an incoming webhook
DiscordPaid Through an incoming webhook
TelegramPaid Straight to a chat or channel
FlockPaid Through an incoming webhook
WebhooksPaid Post to anything you run yourself

There are no voice calls and no SMS. If a phone call at 3am is a hard requirement, say so before you subscribe — we would rather tell you now than refund you later.

FAQ

Assertible alternative: your questions answered

What API checks do you support?

Request method, custom headers, basic authentication, request body and keyword conditions on the response. Enough to confirm an endpoint is alive and returning the expected string.

Can you assert on a JSON field?

No. If the check must parse a body and assert on a field, Assertible or Checkly are the right tools.

Do you run tests after deployment?

No. Checks run on their schedule; there is no CI trigger.

Do you monitor certificates on API endpoints?

Yes — SSL and domain expiry attach to any monitor including one pointed at an API.

Do you support POST with a body?

Yes, which covers endpoints that need more than a GET.

Can I use both?

Yes — Assertible for functional correctness, this for continuous availability plus certificates and domains.

Keep reading

Compare other monitoring tools

Last updated August 4, 2026 · Written by Amit Gupta, founder of MonitoringDaddy

AG
Written by

Amit Gupta

Amit Gupta is the founder of MonitoringDaddy , a website and infrastructure monitoring platform built by TotosLocal One Private Limited. He writes about uptime, change detection, SSL and domain monitoring, and helps teams keep their websites fast, secure and online.

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