Vendors
Every vendor we track
Product analytics
| Vendor | Free tier | Pricing data | Open source | Last checked |
|---|---|---|---|---|
| Amplitude | Free plan: 2M events/month, unlimited seats, includes session replay and feature flags with limited volumes. | Partially published | No | 2026-10-19 |
| Heap | Free plan: up to 10K monthly sessions. | Contact sales | No | 2026-10-19 |
| Mixpanel | Free plan: up to 1M events/month, 10K session replays/month, unlimited seats. | Published pricing | No | 2026-10-19 |
| Pendo | Pendo Free: up to 500 MAUs (analytics, in-app guides, Pendo-branded roadmaps/NPS). | Contact sales | No | 2026-10-19 |
| PostHog | 1M analytics events, 5K session recordings, 100K AI-observability events, 1M feature-flag requests per month (resets monthly). | Published pricing | Yes | 2026-10-19 |
Session replay
| Vendor | Free tier | Pricing data | Open source | Last checked |
|---|---|---|---|---|
| Fullstory | Fullstory Free: 30,000 monthly sessions and 12 months of analytics retention. | Contact sales | No | 2026-10-19 |
| Hotjar | Free: 200K monthly analytics sessions, but session replay captures ~5% of sessions (max 10K). | Published pricing | No | 2026-10-19 |
| LogRocket | Free plan at 1,000 sessions/month on the pricing calculator. Also a 14-day free trial. | Partially published | No | 2026-10-19 |
| Microsoft Clarity | Free forever; 'No limits on traffic' per the Clarity site. | Published pricing | No | 2026-10-19 |
| Mixpanel | Free plan: up to 1M events/month, 10K session replays/month, unlimited seats. | Published pricing | No | 2026-10-19 |
| Mouseflow | Free: 500 sessions/month, 1 website, 1 month retention. | Partially published | No | 2026-10-19 |
| PostHog | 1M analytics events, 5K session recordings, 100K AI-observability events, 1M feature-flag requests per month (resets monthly). | Published pricing | Yes | 2026-10-19 |
| Smartlookend of sale | Existing accounts drop to the Free plan after their paid subscription ends, until 30 Sep 2027. | Discontinued | No | 2026-10-19 |
LLM & agent observability
| Vendor | Free tier | Pricing data | Open source | Last checked |
|---|---|---|---|---|
| Arizeacquired | AX Free: 25K spans/month, 1 GB ingestion, 15-day retention. Phoenix OSS is free to self-host. | Partially published | Yes | 2026-10-19 |
| Braintrust | Starter: $0/mo, 1 GB processed data and 10K scores/month, unlimited users. | Published pricing | No | 2026-10-19 |
| Heliconemaintenance mode | Hobby: 10K requests/month, 1 GB storage, 1 seat, 7-day retention. | Published pricing | Yes | 2026-10-19 |
| Laminar | Free: 1 GB data/month (no overage), 7-day data access, 1 project, 1 seat. | Published pricing | Yes | 2026-10-19 |
| Langfuseacquired | Hobby: 50K units/month free, no credit card. Self-hosting the MIT-licensed core is free. | Published pricing | Yes | 2026-10-19 |
| LangSmith | Developer: $0, 1 seat, 5K base traces/month, then pay-as-you-go. | Published pricing | No | 2026-10-19 |
| Opik (Comet) | Free Cloud: 25K spans/month, up to 10 team members, 60-day retention. Open source: unlimited, self-hosted. | Published pricing | Yes | 2026-10-19 |
| PostHog | 1M analytics events, 5K session recordings, 100K AI-observability events, 1M feature-flag requests per month (resets monthly). | Published pricing | Yes | 2026-10-19 |