updown.io Alternative: Fixed Monthly Plans Instead of Prepaid Credits

• Very low cost for a few sites. Its own example: 10 websites every 2 minutes from 1.83 € to 5.49 € a month, depending on the credit pack.
• Intervals from 15 seconds to 1 hour, with the price scaling linearly. Enterno stops at 1 min.
• Many alert channels on every account: email, webhook, Slack, Teams, Telegram, SMS, Statuspage and Zapier.
• Double-checked downtime from at least two of its 10 monitoring nodes on five continents, and dual-stack IPv4/IPv6 checks.
• Payment options: cards, PayPal, SEPA and cryptocurrency.

• A free plan. updown.io gives 100,000 free credits to try; Enterno Scout keeps 10 monitors at 5 min running with no credits to top up.
• Fixed monthly cost. Plans include a monitor count and an interval, so adding a check does not change the bill until you hit the limit.
• More check types: DNS, port, API and heartbeat monitors alongside HTTP, SSL and domain expiry.
• A Moscow vantage point. updown.io lists no node in Russia; every Enterno monitor checks from Moscow.

With updown.io one credit is one check. A single URL checked every minute uses about 43,200 credits a month; checked every 5 minutes, about 8,640. The smallest pack, 200,000 credits for 5 €, covers one 1-minute monitor for roughly four and a half months. SMS alerts cost 7,500 credits each.

On Enterno you choose a plan instead: 10 monitors free at 5 min, or 150 monitors at 1 min on Navigator for $19/mo. Pick credits if you watch a few URLs and want short intervals; pick a plan if you want a number that does not move.

Take ten URLs. Checked every 5 minutes, they use about 86,400 updown.io credits a month, roughly 2.2 € with the smallest pack (200,000 credits for 5 €). Checked every minute, they use about 432,000 credits, roughly 10.8 € a month with that pack and less with larger packs.

On Enterno, Scout covers up to 10 monitors at 5 min for nothing, and 1-minute checks start at Navigator ($19/mo for 150 monitors). So for a few fast checks updown.io is cheaper; for dozens of monitors, or a budget line that does not move, a flat plan is easier to plan around.

• Three to ten URLs, short intervals, minimal UI: updown.io. It is hard to beat on price per check at that size.
• A fixed budget line and dozens of monitors: Enterno, so a new check does not change the invoice.
• DNS, port or API checks, or users in Russia: Enterno.
• Telegram, Slack and SMS alerts with no plan tiers: updown.io includes all channels on every account; Enterno has email, Telegram, Slack, Discord, Microsoft Teams, PagerDuty, Jira and webhooks on every plan, but no SMS.

updown.io exposes its checks through a REST API, so a short script can list them. Recreate each one through Enterno REST API v4 or in Monitors; pulse and cron checks map to heartbeat monitors.

curl -X POST https://enterno.io/api/v4/monitors \
  -H "X-API-Key: $ENTERNO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com","check_type":"http","interval_minutes":5,"show_on_status_page":true}'