StackHighlight.io
A discontinued all-in-one session replay, error, and log tool that shut down on February 28, 2026 after LaunchDarkly acquired it.
What it actually does
Highlight.io was an open-source-core observability tool that combined session replay, error monitoring, logs, and traces, with a free tier of around 500 sessions. It let a solo founder see a replay of the user session tied to the error and logs from the same request.
LaunchDarkly acquired it in April 2025 and deprecated the hosted service on February 28, 2026. app.highlight.io no longer accepts new data, and the migration path routes you into LaunchDarkly Observability, a feature-flag platform priced for teams.
Nobody new should sign up in 2026. It remains in this reference only to flag the shutdown for people following older recommendations. The same ground is covered today by Sentry (replays included free) or PostHog.
Highlight.io vs its main rivals
The tools people actually weigh against Highlight.io: PostHog, Sentry, OpenReplay, LaunchDarkly Observability. Same criteria for every column, including where Highlight.io loses.
 PostHog |  Sentry | OOpenReplay | LLaunchDarkly Observability | ||
|---|---|---|---|---|---|
Pricing & access | |||||
| Free tier | NoShut down | Yes5k replays/mo | Yes50 replays/mo | Yes1k sessions/mo | NoTrial only |
| Starting price | Discontinued | Usage-based | $26/mo | ~$5.95/1k sessions | Usage-based |
| Still operational | NoNo | YesYes | YesYes | YesYes | YesYes |
Coverage | |||||
| Session replay | NoWas yes | YesYes | YesYes | YesYes | YesYes |
| Error monitoring | NoWas yes | YesYes | YesYes | YesYes | YesYes |
| Logs / traces | NoWas yes | NoLimited | YesYes | NoLimited | YesYes |
| Product analytics | NoNo | YesYes | NoNo | YesSome | NoNo |
Developer & API | |||||
| Self-host option | NoWas yes | YesYes | YesYes | YesYes | NoNo |
| REST API | No | Free | Free | Free | Paid |
Team & enterprise | |||||
| Accepts new data | NoNo | YesYes | YesYes | YesYes | YesYes |
| Vendor support | NoNone | YesYes | YesYes | YesYes | YesYes |
- Was a capable all-in-one: session replay, errors, logs, and traces with a ~500-session free tier
- Open-source core meant you could self-host if the hosted price got out of hand
- Its team and technology live on inside LaunchDarkly Observability for existing LaunchDarkly users
- The hosted service was deprecated on February 28, 2026; app.highlight.io no longer accepts new data
- Every operational competitor beats it on the only row that matters now: it is shut down and accepts no data
- The migration path forces a LaunchDarkly account and SDK swaps, moving you onto a feature-flag platform priced for teams
Pay less for it
5 ways foundThe service shut down February 28, 2026; there is nothing to buy
Sentry's free Developer plan covers errors plus 50 session replays/mo at $0
PostHog bundles session replay, errors, and product analytics in its free tier
Open-source session replay you can run yourself for infrastructure cost only
PostHog — Covers the same session-replay-plus-errors ground as Highlight did, with a free tier and an open-source self-host option, and it is still operational
StackTracker tracks what you actually pay for Highlight.io and every other tool, flags overpayment, and shows the dollars you would save by switching.
Is it the right tool for you
- The service is shut down and accepts no new data, so nobody should adopt it in 2026 → use PostHog
- You want session replay tied to errors from a still-operational vendor → use Sentry
Track what Highlight.io and the rest of your stack cost
StackTracker adds up every subscription, plus your hours, so you see the real number.
Prices and limits last verified 2026-07-20.