Quick answer
SweetUptime - SweetUptime wins for most builders who want the largest free monitoring bundle and the cheapest path into paid plans, while UptimeToolbox wins only if you need alert channels, retention, and a richer status-page toolset more than raw free-tier capacity.
How the free tiers compare
These two free tiers solve different problems. SweetUptime is the better fit when you need to cover more endpoints, servers, and status pages at the lowest friction. Its free plan gives 20 uptime monitors, 20 domain and SSL checks, 10 servers, and 5 status pages, plus 1-minute checks and downtime alerts, so it is built for a small but real monitoring footprint. UptimeToolbox is smaller on core free quotas but broader on adjacent ops features: it includes SMS and voice credit, custom domains, white labeling, team members, and longer historical retention. That makes it more attractive if you care about how incidents are communicated and archived, not just how many things you can watch. On pricing, SweetUptime also starts cheaper, at $9 versus $29.
SweetUptime vs UptimeToolbox free tier, side by side
| SweetUptimeFTV 47 | UptimeToolboxFTV 56 | |
|---|---|---|
| Uptime monitorsSweetUptime includes separate uptime monitor and domain/SSL check quotas; UptimeToolbox’s free plan is much smaller on monitor count. | 20 | 5 |
| Domain and SSL checksUptimeToolbox confirms SSL monitoring, but no explicit free quota was provided. | 20 domain and SSL monitors | SSL monitoring included |
| ServersSweetUptime gives more room for mixed web and server monitoring. | 10 | 1 |
| Status pagesSweetUptime is better if you need multiple pages for different projects. | 5 | 1 |
| Check intervalSweetUptime checks more frequently on the free tier. | 1 minute | 3 minutes |
| RetentionUptimeToolbox is stronger on data history in the free tier. | Not specified | 7 days high-resolution retention; 3 months historical data |
| Alert channelsUptimeToolbox offers more alert delivery options, including phone-based alerts. | Email, Slack, Discord, Telegram | Email, SMS, voice calls, Slack, OpsGenie, webhooks |
| Credit card required to startBoth inputs explicitly say no credit card is required. | No | No |
After you outgrow the free tier
SweetUptime uses flat monthly pricing, starting at $9/month, then $19 and $29, with custom plans by contact. UptimeToolbox also uses flat monthly pricing, but starts much higher at $29/month and then jumps to $99/month. The main divergence is simple: SweetUptime is the cheaper expansion path for small teams, while UptimeToolbox charges more but bundles broader incident and reporting features. No usage-based rates were provided, so there are no per-unit cost scenarios to compute.
Cost at real usage
| Usage | SweetUptime | UptimeToolbox |
|---|---|---|
| Small team moving off free tierFirst paid plan comparison only; both are flat-priced. | $9/mo | $29/mo |
| Mid-sized monitoring setupSweetUptime ADVANCED vs UptimeToolbox Business. | $19/mo | $99/mo |
| Larger but still sub-enterprise setupSweetUptime pro matches UptimeToolbox's lower Business plan only in price direction, not in feature mix. | $29/mo | $99/mo |
Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.
When to pick each one
Pick SweetUptime when…
- You need to monitor more than a handful of endpoints without paying yet.
- You want the cheapest paid upgrade after the free tier.
- You are tracking multiple servers plus separate SSL and domain expiry checks.
- You need several public or private status pages for small projects or clients.
Pick UptimeToolbox when…
- You need SMS or voice alerts included in the free plan.
- You care about longer built-in retention and historical data from day one.
- You want custom domains and white labeling included even on the free tier.
- You only need a small number of monitors but want more incident-communication features around them.
Bottom line
For the most common builder case, SweetUptime is the better free-tier choice because it gives more monitors, more servers, more status pages, and a much cheaper upgrade path. UptimeToolbox is the better pick only if the free plan’s broader ops extras matter more than quota depth, especially SMS and voice alerting, custom domains, white labeling, and retention. If you are trying to stretch a free tier before paying, SweetUptime is the one most builders will outgrow more slowly and upgrade into more cheaply.
Read the full listings: SweetUptime and UptimeToolbox. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.