Why not show a price for every number of domains?

Because we'd have to invent it. Vendors publish tiers, not a formula: between ten and a hundred monitors at UptimeRobot there is no public price we could quote without manufacturing it. A table that interpolates looks more complete and is wrong, which is the worst possible combination on a comparison page.

Does fifty domains mean fifty clients?

Rarely. One client often holds two or three names: the main one, a misspelled variant bought later, and a country extension. That's one reason a portfolio grows without anyone noticing, and one reason we sort domains by client rather than into a single list.

What happens past a hundred and fifty domains here?

The Agency plan extends in packs of 100 domains at $10 a month. Past two or three packs, an unlimited flat rate like Domains Defender's comes out cheaper than ours, and we'd rather write that here than let you find it on your invoice.

Comparison

Monitoring fifty domains: what it really costs

Fifty domains is what a five to ten person agency ends up holding after a few years. It's also the point where the spreadsheet stops working and where the price per domain stops being a detail. Here is the calculation, made from each vendor's published tiers and nothing else.

Prices taken on 12 September 2026 from the public pricing pages, in dollars, monthly billing. The calculator below does exactly one thing: it finds the published tier that covers the number you ask for and divides its price by that number. It doesn't interpolate between tiers, it doesn't extrapolate past the last one and it converts no currencies. When no published tier covers the number, it says so instead of inventing a figure.

What changes at fifty domains

Below ten domains everything works, a calendar reminder included. The breaking point isn't where you'd expect: what breaks manual monitoring isn't the number of sites, it's the number of dates to keep. Fifty domains means fifty expiry dates, fifty certificates to renew — often three or four times a year each when they renew automatically — and as many DNS zones nobody ever rereads.

The second threshold effect is noise. One useless alert on one domain is an anecdote; the same useless alert across fifty domains is a reason to mute the notifications, and a watch whose notifications are muted has stopped being a watch. That's why we confirm an outage with a second check before writing, and why we tightened the alert thresholds on short-lived certificates instead of warning thirty days ahead of an automatic renewal that happens on its own.

The third is setup. Fifty domains entered one by one is half a day nobody will ever spend, and it's the real reason so many agencies have no monitoring at all. We read the zones of a Cloudflare account to add the domains in bulk; the other vendors offer programming interfaces, which assumes somebody to write the script.

The calculation, tier by tier

Move the slider. Each row shows the published tier that covers that number, its listed monthly price, and that price divided by the number of domains you chose.

Number of domains to watch50

The plan	The published tier that covers it	Per month	Per domain
DomainVigilOne domain, seven watches, one line on the bill.	Agency plan, 150 domains	$49	$0.98
UptimeRobotOne monitor per domain, the assumption most generous to them. Their pricing page doesn't say whether DNS and expiry monitoring use another monitor. A Solo tier at fifty monitors exists: it shows at €22 a month from France and we have never seen it in dollars, so it's absent here — between eleven and fifty domains, their real bill is lower than this row.	Team plan, 100 monitors	$46	$0.92
Site24x7One monitor per domain here too. Their documentation states that domain expiry and the certificate each count as a monitor: at three watches per domain, divide the tier's capacity by three. Past forty sites, their next published tier jumps to 2,500 sites for $999; the real answer runs through add-on packs whose price we didn't check, so the row stays empty rather than showing a figure that means nothing.	No published tier covers it	—	—

The per-domain price is the tier price divided by the number you chose, not by the tier's capacity: what you pay, divided by what you watch. A monitor at UptimeRobot or Site24x7 and a domain here don't cover the same thing — see the caveat under each row.

Domains Defender advertises €49.99 a month excluding tax for an unlimited number of domains, checked on 25 August 2026. That amount is in another currency and excludes tax, so it's deliberately absent from the table above: converting it would mean manufacturing a figure.

What the others do better at fifty domains

Price isn't the only criterion, and on three specific points the comparison doesn't run our way.

UptimeRobot is faster everywhere. Sixty seconds from Solo up against a one-minute check reserved for our Agency plan, and thirty seconds on their Team plan.
Site24x7 checks from thirty-two locations on its $10 plan. With fifty domains spread across several countries that's a real difference: we can't tell a regional outage from a global one.
Domains Defender offers a flat rate for an unlimited number of domains. Past 150 domains we charge extensions in packs of 100, and their flat rate becomes the better deal.
UptimeRobot and Site24x7 both have a free plan that covers fifty monitors. If all you want is uptime on fifty sites, both do it for nothing, and we don't.

What DomainVigil does better at fifty domains

It's precisely the portfolio size the product was designed around.

The Agency plan covers 150 domains for $49 a month, all seven watches included. At fifty domains you pay under sixty cents per domain per month and you still have a hundred places left.
Nothing to arbitrate. You never have to decide which domains deserve certificate monitoring: it's on all of them, all the time.
Domains sorted by client, with a status page for each client. At fifty domains spread over thirty or so clients, that's the difference between a list and a working tool.
Import from a Cloudflare account: the zones are read and the domains added in bulk, instead of fifty entries typed by hand.
10 seats on the Agency plan, and any number of people receiving the alerts without being able to change anything — the client can stay in the loop without costing a seat.

The four costs everyone forgets

The listed price is never the price paid. At fifty domains, these four lines weigh more than the gap between two plans.

Setup. Fifty domains typed in by hand is three to four hours. Before choosing, check whether the tool can read your domains from your DNS host or whether somebody will have to write a script.
Noise. One useless alert per domain per month is fifty messages nobody reads after six weeks. Look at how the tool confirms an outage before writing, and whether it knows to stay quiet during an automatic renewal.
Seats. At UptimeRobot, three console seats are included on the Team plan and an extra seat is listed from $15 a month. Here, 3 seats on Pro and 10 on Agency, and the people who only receive the alerts without being able to change anything are neither counted nor capped.
History. The day a client insists their site was unreachable all last month, retention settles the argument. Three months on UptimeRobot's free plan, twenty-four on Team; 30 days on our free plan, 365 on Agency.

How to decide

If your fifty domains are fifty brochure sites you answer for in front of clients, the deciding factor isn't detection speed but the number of dates kept without thinking about them. That's what we do, and the Agency plan at $49 covers three times your portfolio.

If your fifty domains carry services whose downtime is counted in money by the minute, choose UptimeRobot and accept paying more: their shortest interval is fifteen times tighter than ours.

And if you're hesitating, start with our 5 free domains on your five most sensitive names. A month of real alerts will tell you what no table can: how many of them deserved to be sent.

Try DomainVigil for free

5 domains free, forever. No card required.

Questions people ask us

Why not show a price for every number of domains?: Because we'd have to invent it. Vendors publish tiers, not a formula: between ten and a hundred monitors at UptimeRobot there is no public price we could quote without manufacturing it. A table that interpolates looks more complete and is wrong, which is the worst possible combination on a comparison page.
Does fifty domains mean fifty clients?: Rarely. One client often holds two or three names: the main one, a misspelled variant bought later, and a country extension. That's one reason a portfolio grows without anyone noticing, and one reason we sort domains by client rather than into a single list.
What happens past a hundred and fifty domains here?: The Agency plan extends in packs of 100 domains at $10 a month. Past two or three packs, an unlimited flat rate like Domains Defender's comes out cheaper than ours, and we'd rather write that here than let you find it on your invoice.