6 free alternatives to Respan

Arize's free tier includes 25k trace spans per month, 1 GB of ingestion per month, 15 days of retention, Alyx, online evals, product observability monitors, custom metrics, dashboards, and community support. That makes it a broader observability starter if your main need is tracing and monitoring around live AI systems. It beats Respan on retention because the free plan clearly includes a retention window, and it also offers a more observability-first setup with spans and ingestion limits called out directly. It falls short on evaluation and prompt workflow headroom because Respan's free plan gives you datasets, evaluators, and prompts in the same package. Switch if you want a more trace-centric free plan and can live with less free room for prompt and dataset workflow.

• Beats Respan: Retention is explicitly included in Arize's free tier.
• Falls short: Respan gives more free room for datasets, evaluators, and prompts.
• Who should switch: Switch to Arize if your free use case is mostly tracing and observability, not prompt and dataset workflow volume.

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Sentry's free tier includes one user account, error monitoring and tracing, email alerts and notifications, and 10 custom dashboards. It is a straightforward choice for developers who want to watch production issues and performance in one place without setting up a separate evaluation workflow. It beats Respan on dashboarding because it explicitly includes custom dashboards, which is a practical advantage for issue triage and alert review. It falls short on AI-specific workflow depth because Respan's free plan includes logs, scores, datasets, evaluators, and prompts for LLM engineering work. Switch if your main job is app monitoring and tracing rather than evaluation-driven AI operations.

• Beats Respan: Sentry's free tier includes custom dashboards.
• Falls short: Respan is much stronger for datasets, scores, evaluators, and prompts.
• Who should switch: Switch to Sentry if you want issue monitoring and tracing more than LLM evaluation tooling.

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Middleware's free offering is a 14-day trial with unlimited data ingestion, unlimited RUM sessions, unlimited synthetic checks, 10 browser test runs, unlimited users, community-based support, and 14-day data retention. That is the widest short-term free headroom in this set if you need to push a lot of data through a platform immediately. It beats Respan on ingestion because the trial allows unlimited data ingestion during the trial window, which is far above Respan's 100k-log cap. It falls short on permanence because it is only a 14-day trial, while Respan's free plan is a standing free tier. Switch if you need a burst of unrestricted testing rather than a long-lived free plan.

• Beats Respan: Unlimited data ingestion during the 14-day trial.
• Falls short: Respan is a perpetual free tier, while Middleware is time-limited.
• Who should switch: Switch to Middleware if you need a short free trial with as much ingest and testing volume as possible.

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Better Stack's free tier includes 10 monitors and heartbeats, Slack and email alerts, 100,000 exceptions per month, 5,000 session replays, 3 GB each for logs, web events, and traces for 3 days, 30 GB of metrics, and one status page. It is a broad observability package if you want monitoring, alerting, and incident-facing features in one place. It beats Respan on the amount of clearly spelled-out monitoring surface, especially monitors, replays, traces, metrics, and a status page. It falls short on AI workflow depth because Respan's free tier is built around logs, scores, datasets, evaluators, and prompts for LLM engineering. Switch if you need general observability more than AI evaluation plumbing.

• Beats Respan: Better Stack includes 10 monitors and heartbeats plus a status page.
• Falls short: Respan offers more free LLM workflow features like datasets, evaluators, and prompts.
• Who should switch: Switch to Better Stack if you want a broader monitoring and incident workflow free tier.

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Embrace's free tier includes up to 1 million sessions per year, up to 5 users, errors, exceptions, crashes, basic performance monitoring, basic dashboards and alerting, and 3 days of events data retention. It is the strongest choice when your free limit needs to be measured in sessions rather than logs or scores, especially for mobile or product analytics style observability. It beats Respan on user collaboration headroom because it allows up to 5 users versus Respan's 2 evaluators on the free tier. It falls short on AI-specific workflow objects because Respan includes datasets, prompts, and scores for evaluation loops. Switch if your team needs a session-based observability plan with a small group of users.

• Beats Respan: Embrace allows up to 5 users on the free tier.
• Falls short: Respan gives more free AI workflow primitives, including prompts and datasets.
• Who should switch: Switch to Embrace if your main constraint is session observability and collaboration rather than prompt evaluation volume.

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Smart Grow Logs' free tier includes 3,000 logs per day, 1 project, 2 applications, 1 user, 2 alerts, and 7 days retention. It is the most lightweight option here, but it is also the easiest to understand if you just need a simple logging pipeline and dashboard. It beats Respan on signup simplicity for logging-focused work because it is explicitly a perpetual free tier with no card required. It falls far short on scale because Respan's 100k logs and 1k scores are much larger allowances, and Respan also includes datasets, evaluators, and prompts. Switch if you want the smallest, simplest free logging setup and do not need LLM evaluation features.

• Beats Respan: No credit card is required for Smart Grow Logs.
• Falls short: Respan has far larger free quotas and much more AI evaluation functionality.
• Who should switch: Switch to Smart Grow Logs if you only need simple perpetual logging with a very small team.

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