Momentic vs Sentry
Momentic vs Sentry (Testing & Debugging). Agent test scores: Momentic 9.6/10, Sentry 9.3/10. Momentic scored 0.3 higher overall in our separate rubric v0.1 tests (editions and tasks can differ — see Edition tested and the notes below). Pricing: Momentic — Free: $0/month with $50 of included usage each month (test steps, hosted runtime, AI features, and Mo share one balance; no overages, runs pause at $0), all core features and AI test authoring, 30-day results retention, no credit card. Scale: $500/month with $500 included usage, add funds from $50, 5 Android + 5 iOS devices, SMS/OTP numbers, shared Slack. Enterprise: custom test-based pricing with SAML/SCIM/audit log; Sentry — Team $26/mo billed annually; Business $80/mo billed annually; Enterprise custom.
Every fact on this page comes from our tool records and test logs. Last updated:
- VibeToolRank score
- 9.6/10
- Last tested
- 2026-11-05
- Runs
- 3 runs
- Outcome score
- 10/10
- Edition tested
- Momentic Free ($50/mo usage). Mo via qa CLI 0.32.0 --effort low; YAML via momentic CLI 3.70.0 local Chromium. Not Scale/Enterprise, not mobile. Published score = 2026-11-05 happy-path; 2026-11-06 seeded bug-finding is supplemental.
- Free plan, as measured
- ~$0.30 Mo happy-path + ~$0.23 estimated YAML steps + ~$2.65 Mo bug-finding (~$3.18 Mo+YAML est) of $50 Free monthly allocation
- Free plan
- Yes: Free plan with $50 of usage each month, no credit card required (official pricing page, verified 2026-11-05)
- Price
- Free: $0/month with $50 of included usage each month (test steps, hosted runtime, AI features, and Mo share one balance; no overages, runs pause at $0), all core features and AI test authoring, 30-day results retention, no credit card. Scale: $500/month with $500 included usage, add funds from $50, 5 Android + 5 iOS devices, SMS/OTP numbers, shared Slack. Enterprise: custom test-based pricing with SAML/SCIM/audit log
- Pricing checked
- 2026-11-06
- VibeToolRank score
- 9.3/10
- Last tested
- 2026-10-16
- Runs
- 3 runs
- Outcome score
- 9/10
- Edition tested
- Sentry Developer (free) plan, US region, @sentry/node 11.8.0
- Free plan
- Yes (Developer): 1 user, 5K errors/mo
- Price
- Team $26/mo billed annually; Business $80/mo billed annually; Enterprise custom
- Pricing checked
- 2026-10-16
Side by side
| Field | Momentic | Sentry |
|---|---|---|
| What it is | MomenticAI QA platform from a YC W24 team. Its new agent, Mo, takes a prompt, explores your web app (a URL or a tunnelled local app) or an uploaded iOS or Android build, and reports bugs with reproduction steps and recordings. It also has agentic tests kept as YAML in your repo, a CLI for local and CI runs, and an MCP server so your coding agent can write, run and debug tests. | SentryError tracking and performance monitoring. |
| Pricing | MomenticFree: $0/month with $50 of included usage each month (test steps, hosted runtime, AI features, and Mo share one balance; no overages, runs pause at $0), all core features and AI test authoring, 30-day results retention, no credit card. Scale: $500/month with $500 included usage, add funds from $50, 5 Android + 5 iOS devices, SMS/OTP numbers, shared Slack. Enterprise: custom test-based pricing with SAML/SCIM/audit log | SentryTeam $26/mo billed annually; Business $80/mo billed annually; Enterprise custom |
| Free tier | MomenticYes: Free plan with $50 of usage each month, no credit card required (official pricing page, verified 2026-11-05) | SentryYes (Developer): 1 user, 5K errors/mo |
| Pricing verified | Momentic2026-11-06 | Sentry2026-10-16 |
| Edition tested | MomenticMomentic Free ($50/mo usage). Mo via qa CLI 0.32.0 --effort low; YAML via momentic CLI 3.70.0 local Chromium. Not Scale/Enterprise, not mobile. Published score = 2026-11-05 happy-path; 2026-11-06 seeded bug-finding is supplemental. | SentrySentry Developer (free) plan, US region, @sentry/node 11.8.0 |
| Tested on | Momentic2026-11-05 | Sentry2026-10-16 |
| Outcome score | Momentic10 | Sentry9 |
| Speed score | Momentic10 | Sentry10 |
| Cost score | Momentic10 | Sentry10 |
| Developer experience score | Momentic7 | Sentry8 |
| Reliability score | Momentic10 | Sentry10 |
| Overall score | Momentic9.6 | Sentry9.3 |
What our tests found
Momentic
Adapted QA task (not T3): Mo verified login + add-to-cart on Momentic's public wizard demo shop in 3/3 sessions (~60–95s, ~$0.08–$0.12 each). Wizard YAML add-to-cart also 3/3. Overall 9.6 (happy-path edition). 2026-11-06 supplemental: Mo caught a seeded local-shop pricing bug (line total = price×qty+1) in 3/3 `qa start --effort low` tunnel sessions (~$0.40–$1.15 each, ~$2.65 total); published Overall unchanged.cloud free plan
- Mo completed the cart brief correctly in 3/3 headless CLI sessions
- Fast on a narrow brief: ~1–1.5 minutes per session at --effort low
- Cheap on Free: ~$0.30 Mo for three happy-path sessions; YAML local runs also inexpensive
- Noninteractive wizard scaffolds a working YAML sample and uploads results
- No credit card on Free; usage pauses at $0 instead of overage bills
- 2026-11-06: Mo caught a seeded +$1/line cart bug in 3/3 tunnelled local-shop sessions with correct expected/actual
- Needs a Momentic account and API key before CLI/Mo work
- npm package for Mo is qa (npx mo is a different project) — easy to miss
- Published Overall 9.6 is the happy-path cart edition; bug-finding is supplemental evidence, not a blended rescore
- Mo does not write Momentic YAML test files; YAML authoring is a separate path
- Free $50/mo is shared across steps, hosted browsers, AI features, and Mo — a max-effort Mo session can burn a large slice
- Tunneling is alpha; local port conflicts (wrong process on 8765) required a URL correction mid-session once
Who it’s for: Vibe coders and small teams who ship fast with coding agents and want an AI agent to bug-bash their web or mobile app before deploy, without hand-writing Playwright scripts.
Sentry
3/3 runs: a Node script captured an exception with a tag and release, and the event, including its stack trace, was queryable in Sentry's API 7-15s later. We tested error capture only, not tracing or source maps.cloud free plan
- 4 lines of SDK setup captured errors with tags and a full stack trace
- Events were visible in the API 7-15 seconds after they were sent
- Repeated errors grouped into a single issue automatically
- Filtering events by tag through the API did not match in our test; listing recent events did
- Free plan is limited to 1 user
- We did not test tracing, replays or source maps
Who it’s for: Solo developers and small teams who want error alerts with stack traces for web and Node apps.
Verdict
Scores use rubric v0.1 from separate runs. Editions and tasks can differ (see Edition tested and What our tests found); some tests were a single run, which caps reliability scores. Overall: Momentic 9.6, Sentry 9.3. Check the free-tier limits above against your project before choosing.
FAQ
Which is better, Momentic or Sentry?
In our tests Momentic scored higher overall (9.6/10 vs 9.3/10). Scores use the same rubric (v0.1) but came from separate runs; editions and tasks may differ (see Edition tested and test summaries), so check the per-dimension scores for what matters to you.
Is Momentic free?
Yes: Free plan with $50 of usage each month, no credit card required (official pricing page, verified 2026-11-05) (pricing checked 2026-11-06).
Is Sentry free?
Yes (Developer): 1 user, 5K errors/mo (pricing checked 2026-10-16).
How much does Momentic cost compared with Sentry?
Momentic: Free: $0/month with $50 of included usage each month (test steps, hosted runtime, AI features, and Mo share one balance; no overages, runs pause at $0), all core features and AI test authoring, 30-day results retention, no credit card. Scale: $500/month with $500 included usage, add funds from $50, 5 Android + 5 iOS devices, SMS/OTP numbers, shared Slack. Enterprise: custom test-based pricing with SAML/SCIM/audit log. Sentry: Team $26/mo billed annually; Business $80/mo billed annually; Enterprise custom.
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Scores come from our own tests and are never for sale; sponsored placements are always labelled. Some links are affiliate links (currently Railway). Disclosure