withflit.app — open beta

Every systemleaves marks.Read them.

Flit catches inbound webhooks, fires outbound API requests, and ingests your logs — giving you one place to intercept, inspect, and act on every signal your systems emit.

Deploy a catch →See the tools
Scroll to explore
Three tools

One signal surface.
Zero ceremony.

Each tool is sharp on its own. Together they cover every direction a signal can travel — inbound, outbound, or arriving as a stream.

01
Inbound
Flit Catch
Deploy an ephemeral webhook endpoint in one command. Every payload is caught, inspected, validated, and stored — HMAC signature and all.
HMAC signature validation
Schema inference → TypeScript / Zod
Payload replay with visual diff
Mock responses with template vars
Noise dedup + rate burst detection
Shareable live view
catch.withflit.app →
02
Outbound
Flit Fire
Fire HTTP requests against any API with assertions, environments, and chaining. From a single fire to a full multi-step flow — tested and repeatable.
Response assertion engine
Chain fires, extract variables
Dev / staging / prod environments
Scheduled fires + failure alerts
Mock server — zero config
Import cURL / OpenAPI / Postman
fire.withflit.app →
03
Streaming
Flit Watch
A local SIEM and syslog receiver for dev and test environments. Ingest, parse, correlate, and replay log events — without sending data anywhere.
Syslog + custom log ingestion
Parser engine + correlation rules
Event injector + scenario replay
Real-time event stream UI
Runs fully local — no cloud
SIEM-grade event enrichment
watch.withflit.app →
How it works

From mark to meaning
in minutes.

1
Deploy a Catch
One command gives you a live webhook URL. Configure HMAC validation, TTL, auto-forward, and noise dedup — all as flags.
flit catch deploy --name stripe --hmac $SECRET
2
Point your service at it
Paste the generated URL into Stripe, GitHub, Shopify — anywhere. Payloads start arriving immediately. Watch them stream in your terminal or the browser.
hook.withflit.app/e/a7f3d9c1
3
Inspect, replay, export
View headers, body, and signature status. Replay to your local server. Infer the schema. Export as NDJSON, CSV, or HAR. Diff two payloads side by side.
flit catch export a7f3d9c1 --format ndjson
4
Fire against your API with Flit Fire
Turn any caught payload into an outbound fire. Chain requests, assert on responses, schedule for continuous monitoring.
flit fire stripe-pi --env staging --assert
glyph — live session
live
Signal at scale
0
Payloads caught today
across all workspaces
0
Flit Fire runs
assertions run this week
0
Log events ingested
via Flit Watch today
0
Developers reading marks
and shipping faster
From the field

Engineers who read
every mark.

“

Replaced RequestBin and Postman at the same time. Flit Catch's HMAC validation alone saved us hours chasing a silent Stripe failure that had been in production for weeks.

MK
Mikael K.
Senior Engineer · Vercel
“

Flit Fire chaining is the thing I didn't know I needed. Create intent → confirm → capture — our entire Stripe checkout runs as a single chain. First run felt like magic.

SR
Sara R.
Platform Lead · Acme
“

We run Flit Watch in our CI preview environments. Correlating log events against webhook payloads from the same request — something no other tool made easy before Flit.

JL
Jamie L.
DevOps Engineer · Shopify
Pricing

Start free.
Scale without friction.

No credit card to start. The free tier covers everything a solo developer needs. Upgrade when your team or volume grows.

For solo devs
Free
$0
forever · no card required
Everything you need to start reading the marks your systems leave behind.
  • ✓5 active catches · 2h TTL
  • ✓500 payloads / day
  • ✓Flit Fire collections (unlimited)
  • ✓3 environments
  • ✓Flit Watch — local only
  • —Team workspaces
  • —Scheduled fires
  • —Alerts
Most popular
For teams
Pro
$19
per seat / month · billed annually
Shared workspaces, scheduling, alerts, analytics, and the full Flit platform.
  • ✓Unlimited catches · 24h TTL
  • ✓50,000 payloads / day
  • ✓Team workspaces (up to 20)
  • ✓Scheduled fires + alerts
  • ✓Analytics dashboard
  • ✓Mock server
  • ✓Flit Watch — cloud sync
  • ✓Priority support
For large teams
Enterprise
Custom
annual contract · flexible billing
SSO, audit logs, on-prem deployment, SLA, and a dedicated solutions engineer.
  • ✓Everything in Pro
  • ✓SSO / SAML
  • ✓Audit log export
  • ✓On-prem / VPC deploy
  • ✓99.9% SLA
  • ✓Custom retention
  • ✓Dedicated engineer
  • ✓Volume pricing

Every system
leaves marks.
Start reading.

Free to start. No credit card. No config files. One command to your first caught webhook.

Deploy your first catch →Read the docs

Free tier — 5 catches · 500 payloads/day · unlimited fires