Best Free AI Debugging Tools in 2026
Debugging tools do not have free tiers in the ordinary sense. They have quotas, and the quota is the product.
Every tool here will happily accept your first event. What decides whether you can actually run on the free plan is how many events you send in a month, and the answer varies by a factor of four thousand across this list. That is not a typo. Sentry's free plan allows 5,000 errors a month. Honeycomb's allows 20 million events.
Those two numbers describe genuinely different tools solving genuinely different problems, and no ranking makes sense until you understand which problem you have.
The free tiers, exactly
Verified against Toolradar's pricing records, checked between 15 and 25 August 2026.
| Tool | Free tier quota | First paid tier | Price checked |
|---|---|---|---|
| Honeycomb | 20M events/month | Pro, $130/month | 19 Aug 2026 |
| New Relic | 100 GB ingest/month, 1 full user | Standard, $10/month | 22 Aug 2026 |
| Sentry | 5,000 errors, 5M spans, 50 replays, 1 user | Team, $26/month | 15 Aug 2026 |
| Rollbar | 5,000 events/month, 30-day retention, 1 user | Essentials, $12.50/month | 25 Aug 2026 |
| GitHub Copilot | Free tier | Pro, $10/month | 16 Aug 2026 |
Read that table twice before reading any of the descriptions below. Honeycomb and New Relic give away an amount of capacity that a small production service will not exhaust. Sentry and Rollbar give you enough to instrument a side project and not much more.
The single-user limit on three of these matters as much as the volume. A free tier for one person is a trial with no expiry date, not a plan a team can sit on.
How they rate
Aggregated by Toolradar across G2, Capterra, TrustRadius and PeerSpot.
| Tool | Aggregated rating | Reviews |
|---|---|---|
| Honeycomb | 4.8 | 19 |
| Sentry | 4.6 | 296 |
| Rollbar | 4.4 | 404 |
| New Relic | 4.4 | 780 |
GitHub Copilot carries no aggregated rating.
New Relic's 780 reviews and Rollbar's 404 are the substantial samples, and both land on 4.4. Sentry's 4.6 across 296 is the best combination of score and evidence in the table. Honeycomb's 4.8 sits on 19 reviews and should be read as an absence of complaints rather than a victory.
There is a pattern worth naming: the two tools with the largest review counts have the lowest scores, and this happens constantly in observability. Big platforms are bought by organisations, deployed to people who did not choose them, and reviewed by those people. Small tools are chosen by enthusiasts. The score partly measures who filled in the form.
Sentry, the default for application errors
Sentry catches an exception, groups it with every other instance of the same exception, and shows you the stack trace with the local variables at each frame. That last part is what people actually pay for, and it is why Sentry became the default.
The AI layer, Seer, goes further: it reads the stack trace against your source and proposes a fix as a pull request. It is billed separately from the plan tiers, per active contributor, at a rate Sentry does not publish, which is worth knowing before you build a budget around the $26 Team price.
The free tier is 5,000 errors a month for one user, checked 15 August 2026. A production service having a bad week will burn through that in an afternoon, and Sentry's own sampling controls exist precisely because of this.
Choose Sentry when your question is "what broke, and in which line".
Honeycomb, when the bug is not an exception
Honeycomb is built for the class of problem where nothing crashed and everything is slow, or where one customer in one region sees failures nobody can reproduce.
Instead of grouping errors, it stores wide events with high-cardinality attributes: user ID, region, feature flag state, build SHA. Then you ask it which combination of those attributes correlates with the slow requests. The AI assistant, bundled into the free tier, translates that question from English into the query.
20 million events a month, free, checked 19 August 2026. That is the most generous free tier in this article by orders of magnitude and it is not a trick. Pro jumps to $130 a month for 100 million events, which is the steepest step up in the list.
Honeycomb is harder to adopt than Sentry, because it requires you to instrument deliberately rather than install an SDK and forget. The payoff is answering questions you cannot phrase in advance.
New Relic, the widest free tier
New Relic's free plan gives 100 GB of data ingest a month and one full platform user, with unlimited basic users, checked 22 August 2026. That covers application monitoring, infrastructure, logs and traces in one place.
For a solo developer or a small team with one designated on-call person, this is a lot of platform for nothing. Overage is $0.40 per GB, or $0.60 on Data Plus, which is the number to watch: the free tier is generous until a chatty debug logger turns it into a bill.
Its 4.4 across 780 reviews is the best-evidenced score here, and the complaints are consistent: the interface is enormous, the pricing model is hard to predict, and both of those are the direct cost of the breadth that makes it attractive.
Rollbar, the cheapest real escape from a free tier
Rollbar does what Sentry does, with a free tier of 5,000 events a month at 30-day retention for one user, and an Essentials tier at $12.50 a month, checked 25 August 2026.
That $12.50 is half of Sentry's $26 and it is the reason Rollbar keeps appearing on lists like this. If error grouping and stack traces are all you need, you are paying Sentry a premium for polish and for Seer.
Rollbar's higher tiers are usage-based and unpublished, which makes forecasting harder than the entry price suggests.
4.4 across 404 reviews. Solid evidence, unremarkable score.
GitHub Copilot, the debugger already in your editor
Copilot is on this list because the fastest debugging loop is the one that never leaves the file you are in. Paste a stack trace into Copilot Chat with the relevant code open and you get a hypothesis immediately, at $10 a month for Pro or free on the free tier.
What it cannot do is tell you the bug is happening at all. It has no production data, no error grouping, no idea that a deploy three hours ago doubled your 500 rate. It is a reasoning tool, not a monitoring one, and pairing it with any of the four above is the actual answer for most teams.
Picking one
Errors in production, small team, tight budget: Rollbar at $12.50, or Sentry if the stack trace quality is worth double.
Slow and weird rather than broken: Honeycomb, and take the 20 million free events seriously.
One person watching everything: New Relic's free tier, with an alert on ingest volume.
Understanding a trace you already have: Copilot, which you may already own.
The one thing not to do is choose on the rating. The two best-evidenced scores in this article are tied at 4.4 and belong to tools that solve different problems.
The month your free tier ends
Every tool here is free until a specific, predictable moment, and it is worth doing that arithmetic before you instrument anything.
Sentry's 5,000 errors sound like a lot until you remember that errors are not distributed evenly. One bad deploy that throws on every page load will produce 5,000 events in the time it takes you to notice and roll back. You do not glide over the free limit, you hit it in one afternoon and then spend the rest of the month blind, which is the worst possible outcome for a monitoring tool.
Rollbar's 30-day retention is the same trap in a different shape. A bug that appears once a quarter is invisible to you, because by the time it happens again the first occurrence has been deleted. Retention, not volume, is what free error tracking really rations.
New Relic's 100 GB is the most forgiving of the three, and the one most likely to end in a surprise, because ingest is measured in gigabytes rather than in events you can count. A team that turns on debug logging for a week to chase something can add tens of gigabytes without any individual person deciding to spend money. At $0.40 per GB past the limit, checked 22 August 2026, an extra 200 GB is $80 nobody budgeted.
Honeycomb's 20 million events is the only quota in this article that most small services genuinely will not reach, and the catch is on the other side: the step from free to Pro is $130, so when you do outgrow it, you outgrow it expensively. There is no $15 middle tier to soften the landing.
The practical move, whichever you choose, is to set an alert on your own consumption in the first week. Every one of these tools can tell you what percentage of your quota you have used. None of them will do it unprompted.
Two questions worth answering first
Do you need AI here at all? The AI features in this category do one of two things: explain a stack trace you could have read yourself, or find a correlation across dimensions you could not have found by hand. The first is convenience. The second is the reason to change tools. Be clear about which you are buying.
Is the bug in your code or in the space between services? Sentry and Rollbar answer the first well and the second badly. Honeycomb and New Relic are the reverse. Most teams pick based on which one a colleague used at their last job, and that is how you end up with an error tracker watching a latency problem.
Related: free error tracking tools, free monitoring tools and free CI/CD tools.
